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WO2008033045A1 - Surface réduisant le frottement et surface destinée à intensifier l'échange massique et thermique - Google Patents

Surface réduisant le frottement et surface destinée à intensifier l'échange massique et thermique Download PDF

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Publication number
WO2008033045A1
WO2008033045A1 PCT/RU2006/000465 RU2006000465W WO2008033045A1 WO 2008033045 A1 WO2008033045 A1 WO 2008033045A1 RU 2006000465 W RU2006000465 W RU 2006000465W WO 2008033045 A1 WO2008033045 A1 WO 2008033045A1
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WIPO (PCT)
Prior art keywords
recesses
recess
radius
concave
flow
Prior art date
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Ceased
Application number
PCT/RU2006/000465
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English (en)
Russian (ru)
Inventor
Gennady Iraklievich Kiknadze
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Individual
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Individual
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Priority to PCT/RU2006/000465 priority Critical patent/WO2008033045A1/fr
Priority to EP06847404.8A priority patent/EP2103818B1/fr
Publication of WO2008033045A1 publication Critical patent/WO2008033045A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/002—Influencing flow of fluids by influencing the boundary layer
    • F15D1/0025—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply
    • F15D1/003—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising surface features, e.g. indentations or protrusions
    • F15D1/005—Influencing flow of fluids by influencing the boundary layer using passive means, i.e. without external energy supply comprising surface features, e.g. indentations or protrusions in the form of dimples
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • F15D1/06—Influencing flow of fluids in pipes or conduits by influencing the boundary layer
    • F15D1/065—Whereby an element is dispersed in a pipe over the whole length or whereby several elements are regularly distributed in a pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/10—Influencing flow of fluids around bodies of solid material
    • F15D1/12—Influencing flow of fluids around bodies of solid material by influencing the boundary layer

Definitions

  • the invention relates to aerohydromechanics, energy, flow technologies, tasks of increasing transport efficiency, medicine and other areas of scientific and technical activity and engineering practice, in which the success of the development and implementation of flow processes and equipment, their functional and technical and economic characteristics depend on the quality flows of a continuous medium and the ability to control the processes of interaction between the flow and the surface as a whole and, in particular, the boundary layers of gas flows, their two-phase liquids and whether multicomponent mixtures in order to reduce aerohydrodynamic losses during the relative motion of the surface and the continuous medium, to reduce cavitation destruction of surfaces and to intensify exchange processes on them.
  • the ranges of sizes of the proposed reliefs are associated with the characteristics of the boundary layers of the flow, while, according to the proposed solution, the surface of the flow contains three-dimensional concave or convex relief elements distributed along it with rounded transition sections that pair these elements with an initially smooth surface; moreover, any the cross-section of relief elements parallel to the plane in which their three nearest peaks lie has the shape of a smooth closed line.
  • the technical result of the implementation of the surface to reduce friction and aero-hydrodynamic resistance of surfaces is: to reduce the aero-hydrodynamic resistance of energy-exchange channels containing the proposed curved sections that are streamlined by continuous flows;
  • the surface to reduce friction with gaseous, liquid media or their mixtures is characterized by the fact that on a smooth surface with or without a protective layer, double curvature depressions are formed formed by second-order convex and concave surfaces conjugated by a common tangent, with the conjugation of the recesses with the initially smooth surface is carried out using convex shapes of the surfaces forming slopes, for which the initially smooth the surface is tangent, and the concave surface forming the bottom of the recess is smooth or with a fairing, and the ratio of the depths h c of the recesses to the dimensions Li of the recesses along the flow direction are in the range: the ratio of the transverse dimension L 2 of the recess to the longitudinal size Li of the recess is in the range:
  • the recesses can be made with longitudinal and / or transverse dimensions, varying along the stream.
  • the recesses can be applied either mechanically or electrochemically, or by forming on the surface a protective layer of polymer deposited on the surface followed by polymerization of the protective layer, or by surface treatment with a laser beam, or using combinations of these methods.
  • Slopes can be formed by a toroidal surface.
  • Slopes can be formed by a hyperbolic surface.
  • Slopes can be formed by an elliptical surface.
  • a surface with a radius of curvature R (.) Having toroidal slopes, on which the radius of the recess r sp of the concave spherical part is determined by the relation: r sp (2h sp R ( .
  • the surface for intensifying convective mass and heat transfer with gaseous, liquid media or their mixtures is characterized in that depressions are formed on a smooth surface, formed by second-order conjugate convex and concave surfaces that are tangent to one another, and the depression is mated to the original a smooth surface is carried out with the help of convex surfaces forming slopes, for which, at the interface, the initially smooth surface is a kasate flax, and the concave surface forming the bottom of the recess is smooth or with a fairing, and the ratio of the depth h c of the recess to the size Li of the recess along the flow direction is in the range:
  • the recesses can be made with longitudinal and / or transverse dimensions varying along the flow.
  • the recesses can be applied either mechanically or electrochemically, or by treating the surface with a laser beam or molding and polymerizing the surface of the protective layer, or using various combinations of these methods.
  • Slopes can be formed by a toroidal surface.
  • Slopes can be formed by a hyperbolic surface.
  • Slopes can be formed by an elliptical surface.
  • the surface can be equipped with a fairing having the shape of a body of revolution with a curved base in the form of a part of the concave surface of the recess, while the projection of the fairing on any plane in which the axis of symmetry of these fairings lie and tangent to the point of intersection of their axis of symmetry with the concave surface of the recess is determined by the ratio :
  • the recesses can be staggered or corridor-like, and the size of the recesses and their depth can increase or decrease in the direction of flow along the plate.
  • Around the main recesses can be located recesses with smaller longitudinal, transverse dimensions and depths.
  • the recesses may be located on the other side of the plate symmetrically or asymmetrically with respect to the recesses of the main side of the plate.
  • the additional surface of the plate containing the recesses is placed relative to the main surface with the formation of a heat exchange channel, while the surfaces of the main and additional plates with recesses are facing each other and are located in parallel due to the spacing elements in the form of protrusions of a spherical, conical, cylindrical or other shape.
  • the size of the recesses and their depth increase or decrease in the direction of flow along or across the pipe.
  • Recesses may be located on the outer surface of the pipe, and protrusions may be located on its inner surface.
  • a curved twisted tape with recesses may be located inside the pipe.
  • On the inner surface of the pipe can be symmetrically or asymmetrically located recesses relative to the recesses on the outer surface.
  • the longitudinal, transverse dimensions and depth of the recesses deposited on the inner surface of the pipe increase or decrease in the direction of flow
  • Recesses are located on the inner surface of the pipe and a curved twisted tape with recesses is installed inside the pipe.
  • the inner surface of the pipe is made without a recess and a twisted tape with recesses is installed inside the pipe.
  • FIG. 1 shows a fragment of a flow surface containing one recess, the totality of such recesses forms a flow surface and implements the proposed method.
  • FIG. 2 shows the surface of the recess with a cowl in the form of a double recess deposited on the surface according to the method one in the other.
  • FIG. 3 shows the surface of the recess with fairings in the form of many small recesses on its surface.
  • FIG. 4 the surface of the recess with a fairing in the form of a recess.
  • FIG. 5 is a diagram of the streamlines of a medium involved in the formation of a secondary swirling structure in a recess on the surface at low speeds of relative motion of the surface and the medium.
  • FIG. 6 shows the same process visualized by photographing.
  • FIG. 7 shows a visualization of the process of compressing a vortex into a recess and absorption into a vortex of a medium from a wall layer of a stream flowing around a surface with recesses.
  • FIG. 8 shows a visualization of a turbulent flow around a relief of three-dimensional depressions.
  • FIG. 9 shows the result of measuring the thickness of the boundary layer on the surface with a recess. 1 - smooth surface, 2 - surface with a recess; the maximum on curve 2 corresponds to the coordinates of the zone of expiration of the tornado-like jet from the recess.
  • FIG. 10 shows a three-dimensional pressure plot experimentally measured on the surface of a recess.
  • the reduced pressure at the periphery corresponds to the absorption of the medium from the boundary layer into the recess, and the increased pressure zone (dome) in the central part of the recess determines the pressure at the end of the self-organizing tornado-like jet, which ensures the outflow the main flow of the mass of the medium; sucked in by a whirlwind;
  • the zone of location of the maximum pressure in the recess coincides with the zone of location of the maximum thickness of the boundary layer above the recess in FIG. 9 and with the coordinates of the location of the fairing from the surface Gertler vortices in FIG. 11, which indicates the "extrusion" of a tornado-like jet from the recess.
  • FIG. Figure 11 presents a visualization of the main stream flow around the recess, demonstrating a change in the structure of the boundary layer due to the formation of surface Hertler’s vortices in the form of “brackets”, indicated by arrows, which replace shear stresses in the traditional Prandtlé layer of adhesion by rolling stresses “brackets” on the surface, which is necessary the condition for self-organization of tornado-like vortices and the basis for reducing friction stresses on the proposed surfaces.
  • a fairing is constructed, built of Gertler’s vortices by a secondary swirling current in a depression of the selected shape.
  • the trunk of a tornado-like vortex is filled with “braids” - Gertler’s vortices, sucked off by the tornado-like vortex, which in the case of using such surfaces for heat and mass transfer causes its high intensity.
  • FIG. 12 shows the surface of a heat exchanger plate with longitudinal ribs.
  • FIG. 13 shows the placement of the plates to form a heat exchange channel.
  • FIG. 14 shows the surface of a heat exchanger pipe.
  • FIG. 15 shows the surface of a pipe with longitudinal ribs.
  • FIG. 16 shows the surface of the pipe with transverse ribs inside.
  • TLJS-DR Talbo Liket Jet Surfase-Result
  • TLJS-HMT surfaces (Tomato Liket Jet Surf-Net & Mass Trapfinder) are used for:
  • the convex part of the curved surface of the recesses - slopes, external to the geometric center of the recesses, is characterized by the radius of curvature R ( + ), and the other, or the internal part of this surface, for example, a segment of a sphere located around the geometric center of the curved section, is characterized by the radius of curvature R Q and the curvature and shape of the convex toroidal part is determined by the ratio:
  • R (-) (r Sp 2 + h sp 2 ) / 2h sp , (D) the ratio of the radii of curvature of the convex and concave parts of the recess is found from the corresponding ratio of conditions (Q) (see below) in the interval:
  • a curvilinear relief is applied to the streamlined surface (Fig. 1) in the form of separate recesses 1 of double curvature, each of which consists of the concave part 2 of the inner curved surface of the recess, having the selected curved shape in the form of a second-order surface without acute angles on it, including, for example, a spherical shape with a radius of curvature R (.), or an elliptical shape with radii of curvature R nn (-) and Rma ⁇ (-), mating with an initially smooth surface 3 convex curved slopes of a toroidal shape of a round, elliptical, parabolic or hyperbolic sections with radii of curvature for which, at the junctions, the initially smooth surface is tangent, and concave and convex surfaces have common tangents at the conjugation points.
  • Rma ⁇ (-) > Rmin (+) and Rmax (+) are determined similarly to the
  • a surface for reducing friction with a gaseous, liquid medium, or mixtures thereof is characterized in that, on a smooth surface with a protective layer in the form of a polymer material deposited on this surface or without it, recesses 1 are formed formed by the convex 4 and concave 2 surfaces of the second of order, the conjugation of the recesses with the initially smooth surface 3 is carried out using forming ramps, convex surfaces, for which in the places of conjugation the initially smooth surface is are tangent, moreover, the concave surface forming the bottom of the recess is smooth or with a cowl 5, and the ratio of the depth h c of the recess to the size L 1 of the recess along the flow direction is in the range
  • the ratio of the transverse dimension L 2 of the recess to the longitudinal Li size of the recess is in the range: when the density f of the location of the recesses on the surface located in the interval:
  • the recesses on the surface can be made with longitudinal and transverse dimensions, varying along the stream.
  • the recesses can be applied either mechanically or electrochemically, or by molding and polymerizing the protective layer, or by surface treatment with a laser beam, or using combinations of these methods.
  • Slopes can be formed either toroidal, or hyperbolic, or parabolic, or elliptical surfaces.
  • Fairings on such surfaces are in the form of bodies of revolution, the curvilinear base of which are parts of the concave surface of the recess, and the projection of the fairing on any plane in which the symmetry axis of the fairing lies and tangent to the intersection of this axis with the concave surface of the recess is determined by the ratio:
  • ⁇ i 2 hi sopst, (F) where ri is the radius of the fairing, hi is its height, which, for a selected radius of curvature R (.), Takes values in the ranges:
  • Fairings can be made in the form of recesses, double recesses or recesses located on the surface of the main recess (figure 2 - figure 4).
  • the surface for intensifying convective mass and heat transfer with a gaseous, liquid medium or mixtures thereof is characterized in that depressions 1 are formed on a smooth surface and are formed by tangent convex 4 and concave 2 second-order surfaces, wherein the recess is conjugated to an initially smooth surface 3 by means of convex surfaces forming slopes for which the initially smooth surface is tangent at the interface, the concave surface forming the bottom of the recess is smooth or with a cowl 5, and the ratio of the depth h c of the recess to the size L 1 of the recess along the flow direction is in the range:
  • the recesses can be made with longitudinal and / or transverse dimensions varying along the flow.
  • the recesses were applied either by mechanical or electrochemical methods, or by forming and polymerizing a protective layer, or by treating the surface with a laser beam, or using combinations of these methods.
  • Slopes can be formed either toroidal, or hyperbolic, or parabolic, or elliptical surfaces.
  • Fairings 5 may be in the form of bodies of revolution having a curved base in the form of a part of the concave surface of the recess, while the projection onto any plane in which the axis of symmetry of these fairings lie and tangent to the point of intersection of the axis of their symmetry with the concave surface of the recess is determined by the ratio:
  • T 1 2 hi const (F) where ⁇ is the radius of the fairing, hj is its height, which, for a selected radius of curvature R (.), Takes values in the ranges:
  • the recesses 1 can be staggered or corridor-like.
  • the size of the recesses and their depth may increase or decrease in the direction of flow along the plate.
  • recesses with smaller dimensions and depths can be symmetrically located.
  • protrusions corresponding to the recesses may be located.
  • the recesses on the other side of the plate can be located symmetrically or asymmetrically with respect to the recesses of the main side.
  • the additional surface of the plate 12 can be placed relative to the main surface of the plate 6 with the formation of a heat exchange channel, while the surfaces of the main and additional plates with recesses face each other and are located in parallel due to the spacing elements 8 in the form of protrusions of a spherical, conical, cylindrical or other shape.
  • the recesses can be located along and across the pipe in a checkerboard or corridor order.
  • the size of the recesses and their depth can increase or decrease in the direction of the flow or across it.
  • the recesses on the inner surface of the pipe can be located symmetrically or asymmetrically with respect to the recesses on the outer surface.
  • On the inner surface of the pipe can be located recesses, the size and depth of which increase or decrease in the direction of flow along the pipe.
  • Recesses may be located on the inner surface of the pipe and a curved twisted strip with recesses is installed inside the pipe.
  • the radii of curvature of the relief, the radii of the traces of the recesses on the formed surface, the depth of the relief and the parameters of the fairing in the case of its arrangement in the recesses are determined by the above ratios and ranges named by the letters, (A) 5 (B) 5 (C) 5 (D) 5 (E ) J (F) 9 (H) 9 (I) 5 (J) (K) and (Q).
  • the main aero-hydrodynamic characteristics of the flows of gases, liquids or their two-phase mixtures are determined in the case of the formation of the proposed flow with built-in tornado-like jets in the channels or similar characteristics for a body moving in the above environments.
  • the ranges of possible changes in the thermophysical properties of the working medium are established, the characteristic size that determines the mode of relative motion of the continuous medium and surface, the Reynolds numbers (Re) are calculated and the possible ranges of their changes are determined.
  • the Re numbers are varied in order to select the possible radii (sizes) of the trace of the recesses on the moldable surface, trying to place their integral numbers along and across the flow or in the direction of movement of the body.
  • the shape of the recesses, the radii of their curvature, and the relief density f are selected using the ranges of their changes indicated by the letters (A), (B), (C) (E) and (Q).
  • the depth h c of the constructed relief is calculated.
  • the density of the recesses, the size of the traces and depths of the relief they develop a technology for forming the surface, prepare the appropriate tool and make channels or bearing surfaces.
  • the present invention is based on the phenomenon of self-organization of quasipotential tornado-like jets of gases, liquids and / or their two-phase mixtures in recesses having a second-order boundary surface discovered by the authors, about 30 years ago, and rearrangement on such surfaces of the boundary layer when these media flow around surfaces with recesses .
  • This phenomenon has been experimentally studied, theoretically described, visualized and tested in laboratory and field conditions in a wide range of velocities and pressures, including in the ranges of subsonic and supersonic air flow velocities and at critical and supercritical parameters of liquid coolants.
  • TJ Torpedo Like Jet
  • TLJSOP Torpedo Like Jet SeIf Orgapizatiop Rocess
  • TLJS-Surface TLJS
  • TJT TopJet Jet Technologies
  • TLJs are formed in flows of gases, liquids, and in their mixtures at practically important regimes of continuous medium motion corresponding to Reynolds numbers Re> 5-10, calculated from the geometric dimensions of the selected curvilinear relief, for example, by the diameter of symmetrical recesses d c or by their depth h c defining the characteristics of the secondary flow in the recess.
  • the dimensionless relation (K), composed of the radius vector of the surface curvature R (+) or R ( .) (Hereinafter, the radius everywhere), the viscosity of the medium v, the magnitude of the velocity vector of the unperturbed continuous flow U ⁇ , and the pulse loss thickness ⁇ 2 (x) in the boundary layer of the flow, being a stability criterion with respect to the appearance of surface vortices such as Gertler vortices in the boundary layer, indicates the possibility of controlling the vortex boundary layer using the parameters of the flow of a continuous medium and the radius of curvature of the streamlined surface.
  • a three-dimensional vortex boundary layer provides the conditions for the conjugation of TLJ with the concave surface of the recesses and does not lead to energy dissipation in a rotating flow, which destroys, as is known, vortex systems formed on smooth surfaces, where the “sticking” conditions L. Prandtl, requiring equalizing the flow rate with the speed of the streamlined surface, and there is no FDMBL.
  • this condition is fulfilled indirectly through the surface vortices arising at the ends of the formed tornado-like jet, which “settled” these surface structures (see Fig. 11).
  • FDMBL surface vortices moving along a curvilinear relief similarly to a roller or wheel have, at the points of contact with the surface or on the interface line with it, the speed, as indicated above, equal to the surface velocity, in the case of resting channels or plates at TLJS, equal to zero, and in case of TLJS moving with a given speed U ⁇ - equal to this speed, which corresponds to the conditions of "adhesion".
  • the remaining surface points of these vortices move with non-zero velocities corresponding to the velocities of the vortices generating these vortices and stitched with them like a swirling stream (see photo of Fig. 11).
  • the ensemble of vortices forming FDMBL is formed by the swirling flow itself at the ends of the jet on a curved surface and is used by a tornado vortex, figuratively speaking, for rolling on these vortices along the surface of the recess.
  • This explains the mechanism for reducing energy dissipation in self-organizing tornado-like jets.
  • the boundary layer on a curved surface is structured into large formations, consisting of vortices in the form of microscopic “brackets” visualized in the photograph of FIG. 11.
  • the flow is provided by the acceleration of the flow on convex slopes of the relief, causing a decrease in static pressure in this zone of the formation of the jet, and the flow rate is determined by the chosen shape and curvature of the boundary surface; - to the system of sources of tornado-like jets, flowing and sucking from the recesses, surface vortices and vorticity from FDMBL formed on the sections of a curved surface, transferring to the main stream, as indicated above, the masses of a continuous medium flowing into the recesses in the form of large formations - macroscopic “little ones” rendered in the photograph of FIG. eleven.
  • Tornado jets are formed, as described above, in the recesses at the “surface - moving medium” interface under the action of forces caused by the shapes of the selected relief, including:
  • the characteristics of the surface vortices arising in such a layer on a curved surface depend, as is known, on the velocity Ui n , the state of the boundary layer (laminar, turbulent), the thickness of the momentum loss Lr in it, and the radii of curvature of the convex-concave relief R ( + ) and R (.), respectively.
  • Such a boundary layer reduces the level of energy dissipation in the flow, reducing the likelihood of its separation from the convex surface of the slopes, and gives the current in the recess a high dynamism due to the conversion of the shear boundary layer into a three-dimensional vortex with which the formed swirl flow is crosslinked.
  • the interface “continuous medium - streamlined surface * is given a curvilinear shape in the form of regularly alternating depressions of double curvature, creating a force action that ensures self-organization in the flow in these FDMBL zones and secondary swirling jets directed from the indicated surface zone of the flow into mainstream.
  • the forces that arise cause an independent force impact on the moving medium, which leads to a curvature of the forms of the flow stream lines, and, as a result, to self-organization of tornado-like jets.
  • the relief of depressions applied to streamlined surfaces changes the structure of the boundary layer of the flow on the boundary surfaces, generates self-organization of tornado-like jets, sucking off a part of the continuous medium concentrated in the zone where the recesses are located on the streamlined surface, affecting the level of flow energy dissipation , and intensifying the exchange processes between the swirling jet and the surface.
  • the choice of the radii of curvature and the size of the curved sections of the streamlined surface is carried out on the basis of theoretical calculations confirmed in experimental studies, they provide the technology of their deposition on the surface and the self-organization conditions of the secondary tornado-like jets built into the flowing stream are fulfilled.
  • the flow of a working continuous medium is either directed onto surfaces formed by recesses, or a relief of this form is applied to the surface of bodies moving in a medium of gases, liquids, or in their two-phase mixtures, reaching this reduces friction stresses on molded surfaces and intensifies the processes of mass and heat transfer between the energy exchange surface and the flows of a continuous medium.
  • the proposed surfaces are used to reduce the aerohydrodynamic resistance of pressure channels and various bodies in a state of relative motion with a continuous medium, and / or to increase the functional efficiency of energy transfer processes and equipment, including heat transfer and mass transfer processes, as well as in other areas, everywhere where, in comparison with traditional methods of mass and heat transfer, it is necessary to intensify metabolic processes with a limited increase or decrease in hydraulic resistance phenomena and reduce cavitation wear of the surfaces of hydraulic turbines, hydraulic pumps, propellers of ship propulsors and other devices operating in a liquid medium.
  • the invention finds application in various modes of transport, including aircraft, automobiles, high-speed rail trains, sea and river vessels, gas turbine units with cooled blades, nuclear power uranium assemblies, steam generators, various heat exchangers, recuperators and other energy exchangers and devices, in household appliances, including in air conditioners, fans, heating appliances, in kitchen utensils such as kettles, pots, pans and R., in various types of sports equipment, including sports cars, motorcycles, bicycles, tracksuits for motorcycling, cycling, swimming, running, etc., in various biochemical processes associated with the movement of gaseous or liquid reagents, as well as the creation of devices and prostheses for circulatory systems, in medical devices for artificial blood supply, purification of blood from harmful impurities, in artificial respiration devices, etc., in other words, in all types of flow technologies in which technological efficiency is due to the movement of gases, liquids, their two-phase and / or multicomponent mixtures.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne l'aérohydromécanique, l'énergétique, les technologies de flux, l'amélioration de l'efficacité des transports et d'autres domaines d'activités scientifiques et techniques et des techniques d'ingénieur. Selon l'invention, la surface réduisant le frottement avec des milieux gazeux, liquides ou leurs mélanges est caractérisée en ce qu'à une surface plane, dotée ou non d'une couche de protection, on a réalisé des renfoncements formés par des surfaces de deuxième ordre convexes ou concaves, couplées par leurs tangentes communes; le couplage du renfoncement possédant une surface lisse à la base se fait au moyen de surfaces convexes formant des pentes pour lesquelles la surface lisse à la base est, aux endroits de couplage, une tangente. La surface concave qui forme la partie de fond du renfoncement est lisse ou possède un carénage, et le rapport de la profondeur hc et de la dimension L1 du renfoncement en direction aval est compris entre of 0,001≤ hc/L1 ≤0,1, le rapport de la dimension transversale L2 du renfoncement est compris dans l'intervalle 0,25≤L2/L1≤1 à la fréquence f de la disposition des renfoncements à la surface, dans la gamme 0,05≤f≤0,5. A cette surface destinée à intensifier l'échange massique et thermique on a réalisé des renfoncements ayant la configuration décrite ci-dessus, avec les proportions 0,1≤ hc/L1 ≤0,5; 0,25≤L2/L1≤1; 0,1≤f≤0,8.
PCT/RU2006/000465 2006-08-31 2006-08-31 Surface réduisant le frottement et surface destinée à intensifier l'échange massique et thermique Ceased WO2008033045A1 (fr)

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PCT/RU2006/000465 WO2008033045A1 (fr) 2006-08-31 2006-08-31 Surface réduisant le frottement et surface destinée à intensifier l'échange massique et thermique
EP06847404.8A EP2103818B1 (fr) 2006-08-31 2006-08-31 Surface reduisant le frottement et surface destinee a intensifier l'echange massique et thermique

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PCT/RU2006/000465 WO2008033045A1 (fr) 2006-08-31 2006-08-31 Surface réduisant le frottement et surface destinée à intensifier l'échange massique et thermique

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Cited By (3)

* Cited by examiner, † Cited by third party
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US20190292915A1 (en) * 2018-03-22 2019-09-26 United Technologies Corporation Case for gas turbine engine
US10518958B2 (en) 2015-12-23 2019-12-31 Sulzer Mixpac Ag Cartridge with reduced friction
CN115238490A (zh) * 2022-07-12 2022-10-25 长安大学 基于包络特征的路面抗滑性能评价方法及评价装置

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US9845902B2 (en) * 2012-05-13 2017-12-19 InnerGeo LLC Conduit for improved fluid flow and heat transfer
US9322690B2 (en) 2013-01-28 2016-04-26 Canada Pipeline Accessories, Co. Ltd Metering tubes for improved fluid flow measurement
NL2017402B1 (en) 2016-09-01 2018-03-09 Univ Delft Tech Body provided with a superficial area adapted to reduce drag when the body is moving relative to a gaseous or watery medium
AT527151A1 (de) * 2023-05-08 2024-11-15 Adrian Leitl Peter Riblet-Struktur sowie Verfahren zur Herstellung einer solchen
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US10518958B2 (en) 2015-12-23 2019-12-31 Sulzer Mixpac Ag Cartridge with reduced friction
US20190292915A1 (en) * 2018-03-22 2019-09-26 United Technologies Corporation Case for gas turbine engine
US10808540B2 (en) * 2018-03-22 2020-10-20 Raytheon Technologies Corporation Case for gas turbine engine
CN115238490A (zh) * 2022-07-12 2022-10-25 长安大学 基于包络特征的路面抗滑性能评价方法及评价装置
CN115238490B (zh) * 2022-07-12 2025-09-09 长安大学 基于包络特征的路面抗滑性能评价方法及评价装置

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