AU2019101286A4 - Bionic surface structure for enhancing evaporation heat transfer of liquid film - Google Patents

Bionic surface structure for enhancing evaporation heat transfer of liquid film Download PDF

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Publication number
AU2019101286A4
AU2019101286A4 AU2019101286A AU2019101286A AU2019101286A4 AU 2019101286 A4 AU2019101286 A4 AU 2019101286A4 AU 2019101286 A AU2019101286 A AU 2019101286A AU 2019101286 A AU2019101286 A AU 2019101286A AU 2019101286 A4 AU2019101286 A4 AU 2019101286A4
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AU
Australia
Prior art keywords
sawteeth
sawtooth
bionic
micro
heat transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU2019101286A
Inventor
Zhiwu Han
Zhiming KANG
Yan Liu
Luquan Ren
Jing Wang
Zhentao XIN
Chengchun Zhang
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Jilin University
Original Assignee
Jilin University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Priority to AU2019101286A priority Critical patent/AU2019101286A4/en
Application granted granted Critical
Publication of AU2019101286A4 publication Critical patent/AU2019101286A4/en
Ceased legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/06—Evaporators with vertical tubes
    • B01D1/065—Evaporators with vertical tubes by film evaporating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface
    • 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
    • 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
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/30—Accessories for evaporators ; Constructional details thereof
    • 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
    • F15D1/0035—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 riblets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/10—Secondary fins, e.g. projections or recesses on main fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/20—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes with nanostructures

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The present invention discloses a bionic surface structure for enhancing evaporation heat transfer of a liquid film. Three-dimensional bionic sawteeth are distributed on the 5 surface of a substrate of a heat transfer pipe or a heat transfer plate, and the size of each three-dimensional bionic sawtooth is nanometer grade or millimeter grade; the three-dimensional bionic sawteeth are arranged obliquely, the inclined directions of the three-dimensional bionic sawteeth are consistent with the flow direction of the liquid film, and the inclined three-dimensional bionic sawteeth are overlapped with one 10 another; a sharp part of each three-dimensional bionic sawtooth is provided with three micro-sized micro sawtooth structures, and the three micro-sized micro sawtooth structures are arranged in a manner that two lower micro sawtooth structures are arranged at two ends and one higher micro sawtooth structure is arranged in the middle, and the heights of the two lower micro sawtooth structures at the two ends are the same; 15 and the three-dimensional bionic sawteeth are arranged in a rhombic shape or a rectangular shape. The three-dimensional bionic sawteeth in the present invention are overlapped with one another, so that the liquid film can be uniformly spread, and dry spots or dry points can be prevented from appearing on the surface; and the sawtooth structure surface can control the flow direction of the liquid film, so that the thickness 20 of the liquid film is reduced, the heat transfer resistance is reduced effectively, and the evaporation heat transfer efficiency of the liquid film is improved.

Description

BIONIC SURFACE STRUCTURE FOR ENHANCING EVAPORATION HEAT TRANSFER OF LIQUID FILM
TECHNICAL FIELD
The present invention relates to a surface structure, in particular to a bionic surface 5 structure for enhancing evaporation heat transfer of a liquid film.
BACKGROUND
Evaporation heat transfer of a liquid film is an efficient heat transfer technology which has been developing in recent years, has unique advantages of small flow rate, small temperature difference, high heat and mass transfer coefficient, simple structure, 10 low power consumption and the like, and is prominently concerned in the aspect of enhancing heat transfer under high heat flow density in the field of traditional industry and the field of high and new technology. Researches indicate that the major causes of influencing the evaporation heat and mass transfer of the liquid film are the flow pattern of the liquid film and the thickness of the liquid film, the flow stability of the liquid film 15 is maintained so that the heat transfer surface is moistened uniformly, dry spots or dry areas can be prevented from appearing on the heat transfer surface due to the fact that the liquid film is broken, and the firstly considered factors are the condition and microstructure of a heat transfer wall. The design is applicable for the microstructural structure of the evaporation heat transfer of the liquid film so as to control the flow 20 pattern of the liquid film and the thickness of the liquid film, and then the evaporation heat transfer performance of the liquid film is improved, and the technology is significant to being energy-saving and environmentally-friendly and guaranteeing the performance and operating life of equipment.
There is no perfect or fashioned theoretical direction for the selection of the structures and sizes of heat function surface fins for enhancing evaporation heat transfer of a liquid film at present, and there is certain blindness in the design. If the morphology or the sizes of the microstructures on the wall are selected improperly, the liquid film is possibly temporarily or permanently broken locally, and the heat and mass transfer 30 performance is worsened. To design and manufacture the functional structure of the surface according to functional requirements is the developmental direction in the field. Searching for a microstructural surface applicable for enhancing evaporation heat transfer of the liquid film is an urgently key problem needing to be solved for heat transfer enhanced researchers.
SUMMARY
The present invention aims to provide a bionic surface structure for enhancing evaporation heat transfer of a liquid film, and a bionic enhanced heat transfer surface with excellent evaporation heat transfer performance is designed based on excellent heat transfer characteristic of a canine tongue and the micro-structures of the canine tongue surface, so that the heat efficiency of the equipment can be improved, the heat transfer area is reduced, the equipment investment is saved, and the bionic surface structure has preferable economic and social benefits.
The technical proposal of the present invention is as follows:
Three-dimensional bionic sawteeth are distributed on the surface of a substrate of a heat transfer pipe or a heat transfer plate, and the structural size of each three-dimensional bionic sawtooth is nanometer grade or millimeter grade; the three-dimensional bionic sawteeth are arranged obliquely, the inclined directions of the three-dimensional bionic sawteeth are consistent with the flow direction of the liquid film, and the inclined three-dimensional bionic sawteeth are overlapped with one another.
A sharp part of each three-dimensional bionic sawtooth is provided with three micro-sized sawtooth structures, and the three micro-sized micro sawtooth structures are arranged in a manner that two lower micro sawtooth structures are arranged at two ends and one higher micro sawtooth structure is arranged in the middle, and the heights of the two lower micro sawtooth structures at the two ends are the same.
The arrangement mode of the three-dimensional bionic sawtooth is rhombic arrangement or rectangular arrangement.
Beneficial effects:
firstly, the three-dimensional bionic sawteeth on the surface of the substrate are overlapped with one another, so that the liquid film can be uniformly spread, and dry spots or dry points can be prevented from appearing on the surface;
secondly, the sawtooth structure surface can control the flow direction of the liquid film, so that the thickness of the liquid film is reduced, the heat transfer resistance is reduced effectively, and the evaporation heat transfer efficiency of the liquid film is improved.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a front view of a single three-dimensional bionic sawtooth of the present invention;
FIG. 3 is a left view of FIG. 2;
FIG. 4 is a top view of FIG. 2;
FIG. 5 is a front view of the three-dimensional bionic sawtooth arranged in a rectangular shape of the present invention;
FIG. 6 is a left view of FIG. 5;
FIG. 7 is a top view of FIG. 5;
FIG. 8 is a front view of the three-dimensional bionic sawtooth arranged in a rhombic shape of the present invention;
FIG. 9 is a left view of FIG. 8;
FIG. 10 is a top view of FIG. 8;
where, 1, three-dimensional bionic sawtooth; 2, surface of substrate of heat transfer pipe or heat transfer plate ; T, thickness of bionic sawtooth; W, width of bionic sawtooth; H, height of bionic sawtooth; Wa, width of relatively high micro sawtooth; Wb, width of relatively low micro sawtooth; Ha, height of relatively high micro sawtooth; Hb, height of relatively low micro sawtooth; Hc, distance between connecting point of relatively low micro sawtooth and relatively high micro sawtooth and bottom of sawtooth; A, distance between three-dimensional bionic sawteeth in front-and-back direction; B, distance between three-dimensional bionic sawteeth in left-and-right direction; and P, in rhombic arrangement, staggered distance in left-and-right direction of three-dimensional bionic sawtooth in front-and-back direction.
DETAILED DESCRIPTION
As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, in the embodiment, three-dimensional bionic sawteeth 1 are distributed on the surface of a substrate 2 of a heat transfer pipe or a heat transfer plate, the inclined angle a of each three-dimensional bionic sawtooth unit body 1 is 50-70°, inclined sawteeth are overlapped with one another and are arranged tightly, and the included angle β of the side edge of each three-dimensional bionic sawtooth 1 and the horizontal direction is 70-90°; the width W of each three-dimensional bionic sawtooth 1 is 0.2-1 mm, the thickness T of each three-dimensional bionic sawtooth 1 is 0.2-1 mm, and the height H of each three-dimensional bionic sawtooth 1 is 0.3-1.2 mm; the three-dimensional bionic sawteeth 1 are arranged obliquely, and the inclined directions of the three-dimensional bionic sawteeth are consistent with the flow direction of the liquid film.
A sharp part of each three-dimensional bionic sawtooth 1 is provided with three micro-sized micro sawtooth structures 11, and the three micro-sized micro sawtooth structures 11 are arranged in a manner that two lower micro sawtooth structures are arranged at two ends and one higher micro sawtooth structure is arranged in the middle, the heights of the two lower micro sawtooth structures at the two ends are the same, the widths Wb of the relatively low micro sawteeth are 0.2-0.5 mm, the width Wa of the relatively high micro sawtooth is 0.1-0.4 mm, the heights Hb of the relatively low micro sawteeth are 0.2-0.8 mm, the height Ha of the relatively high micro sawtooth is 0.3-1.2 mm, and the distances Hc between the connecting points of the relatively low micro sawteeth and the relatively high micro sawtooth and the bottoms of the sawteeth are 0.3-0.8 mm.
There are two arrangement modes of the three-dimensional bionic sawtooth 1, which are rhombic arrangement and rectangular arrangement; as shown in FIG. 5, FIG. 6 and FIG. 7, the arrangement mode is rectangular arrangement, the distance A between the three-dimensional bionic sawtooth 1 in the front-and-back direction is 0.2-1 mm, and the distance B between the three-dimensional bionic sawtooth 1 in the left-and-right direction is 0.2-1 mm; as shown in FIG. 8, FIG. 9 and FIG. 10, in the rhombic arrangement, the distance A between the three-dimensional bionic sawtooth 1 in the front-and-back direction and the left-and-right direction, which is the same as that when the three-dimensional bionic sawteeth 1 are arranged in the rectangular shape, is 0.2-1 mm, and the staggered distance P in the left-and-right directions of the three-dimensional bionic sawtooth 1 in the front-and-back direction is 0.3-0.8 mm.

Claims (5)

1. A bionic surface structure for enhancing evaporation heat transfer of a liquid film, wherein three-dimensional bionic sawteeth (1) are distributed on the surface of a substrate (2) of a heat transfer pipe or a heat transfer plate, the three-dimensional bionic sawteeth (1) are arranged obliquely, the inclined directions of the three-dimensional bionic sawteeth are consistent with the flow direction of the liquid film, and the inclined three-dimensional bionic sawteeth (1) are overlapped with one another.
2. The bionic surface structure for enhancing evaporation heat transfer of the liquid film according to claim 1, wherein the arrangement mode of the three-dimensional bionic sawteeth (1) is rhombic arrangement or rectangular arrangement.
3. The bionic surface structure for enhancing evaporation heat transfer of the liquid film according to claim 1 or 2, wherein a sharp part of each three-dimensional bionic sawtooth (1) is provided with three micro-sized micro sawtooth structures (11), and the three micro-sized micro sawtooth structures (11) are arranged in a manner that two lower micro sawtooth structures are arranged at two ends and one higher micro sawtooth structure is arranged in the middle, and the heights of the two lower micro sawtooth structures at the two ends are the same, preferably, wherein the widths Wb of the relatively low micro sawteeth of the three micro-sized sawtooth structures (11) are 0.2-0.5 mm, the width Wa of the relatively high micro sawtooth is 0.1-0.4 mm, the heights Hb of the relatively low micro sawteeth are 0.2-0.8 mm, the height Ha of the relatively high micro sawtooth is 0.3-1.2 mm, and the distances Hc between the connecting points of the relatively low micro sawteeth and the relatively high micro sawtooth and the bottoms of the sawteeth are 0.3-0.8 mm.
4. The bionic surface structure for enhancing evaporation heat transfer of the liquid film according to claim 1 or 2, wherein the inclined angles a of each three-dimensional bionic sawtooth (1) is 50-70°, and the included angle β of the side edge of each three-dimensional bionic sawtooth (1) and the horizontal direction is 70-90°; the width W of each three-dimensional bionic sawtooth (1) is 0.2-1 mm, the thickness T of each three-dimensional bionic sawtooth (1) is 0.2-1 mm, and the height H of each three-dimensional bionic sawtooth (1) is 0.3-1.2 mm.
2019101286 24 Oct 2019
5. The bionic surface structure for enhancing evaporation heat transfer of the liquid film according to claim 2, wherein when the three-dimensional bionic sawteeth (1) are arranged in the rectangular shape, the distance A between the three-dimensional bionic 5 sawteeth (1) in the front-and-back direction is 0.2-1 mm, and the distance between the three-dimensional bionic sawteeth (1) in the left-and-right direction is 0.2-1 mm;
wherein when the three-dimensional bionic sawteeth (1) are arranged in the rhombic shape, the distance A between the three-dimensional bionic sawteeth (1) in the front-and-back direction and the left-and-right direction, which is the same as that when 10 the three-dimensional bionic sawteeth (1) are arranged in the rectangular shape, is 0.2-1 mm, and the staggered distance P in the left-and-right directions of the three-dimensional bionic sawteeth (1) in the front-and-back direction is 0.3-0.8 mm.
AU2019101286A 2019-10-24 2019-10-24 Bionic surface structure for enhancing evaporation heat transfer of liquid film Ceased AU2019101286A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2019101286A AU2019101286A4 (en) 2019-10-24 2019-10-24 Bionic surface structure for enhancing evaporation heat transfer of liquid film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2019101286A AU2019101286A4 (en) 2019-10-24 2019-10-24 Bionic surface structure for enhancing evaporation heat transfer of liquid film

Publications (1)

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AU2019101286A4 true AU2019101286A4 (en) 2019-12-05

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MK22 Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry