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Through-hole metal foam with gradually varied morphologic characteristics, preparation method of through-hole metal foam, and heat exchange device

A technology of metal foam and shape characteristics, applied in metal processing equipment, manufacturing tools, heat exchange equipment, etc., can solve the problems of low heat exchange efficiency, large amount of consumables, large volume, etc., achieve less metal consumables, increase heat exchange Thermal specific surface area, effect of small volume

Inactive Publication Date: 2013-04-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a through-hole metal foam with gradual deformation characteristics and its preparation method and heat exchange device, which can rationally utilize the heat transfer gradient performance of the metal skeleton and the fluid to provide thermal expansion The fluid provides a suitable flow space, so that the fluid can take away more heat, which can greatly enhance the heat transfer; especially in the field of phase conversion heat transfer, it can improve the efficiency of two-phase heat transfer and solve the problem of existing heat transfer Problems such as low heat exchange efficiency, large amount of consumables, and large volume

Method used

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  • Through-hole metal foam with gradually varied morphologic characteristics, preparation method of through-hole metal foam, and heat exchange device
  • Through-hole metal foam with gradually varied morphologic characteristics, preparation method of through-hole metal foam, and heat exchange device
  • Through-hole metal foam with gradually varied morphologic characteristics, preparation method of through-hole metal foam, and heat exchange device

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Effect test

Embodiment 1

[0026] like figure 1 As shown, this embodiment includes: a copper substrate 1 and a first through-hole copper foam layer 2, a second through-hole copper foam layer 3, a third through-hole copper foam layer 4, and a fourth through-hole copper foam layer sintered on one side of the copper substrate 1. layer 5 and fifth via copper foam layer 6. After the through-hole copper foam layer is prepared by the investment casting method, the copper foam 2 is brazed to the copper substrate 1 .

[0027] The density of 2 holes in the first through-hole copper foam layer is 40PPI; the density of 3 holes in the second through-hole copper foam layer is 30PPI; the density of 4 holes in the third through-hole copper foam layer is 20PPI; the density of 5 holes in the fourth through-hole copper foam layer is 10PPI; the density of 6 holes in the fifth through-hole copper foam layer is 5PPI.

[0028] Specific steps of investment casting method:

[0029] The first step is to glue polyurethane spon...

Embodiment 2

[0034] like figure 2 As shown, this embodiment includes: a heat exchange wall 7 and a through-hole metal foam 8 sintered on one side thereof, wherein the density of the through-hole metal foam 8 gradually decreases along the vertical direction outward of the heat exchange wall 7 .

[0035] If the heat flow of the heat exchange wall 7 is very large, the pore density of the metal foam close to the heat exchange wall 7 can be selected as the highest pore density 130PPI that can be prepared at present, the porosity is selected as low as 0.88, and the material is preferably selected with a high thermal conductivity metals, such as pure copper, brass, etc., so the contact area between the metal skeleton close to the heat exchange wall 7 and the heat exchange wall 7 is large, and the thermal conductivity of the metal skeleton is high, which is beneficial to the heat transfer wall 7 through heat conduction way to transfer more heat to the foam. In the case of single convective heat ...

Embodiment 3

[0038] like image 3 Therefore, this embodiment includes: two heat exchange wall surfaces 7, a first through-hole metal foam 9 and two second through-hole metal foams 10, wherein: the first through-hole metal foam 9 is sintered in the middle of the two heat exchange wall surfaces , the density of the foam is larger in the middle and smaller at the two sides, and the two second through-hole metal foams 10 are respectively sintered on the outer sides of the two heat exchange walls, and the density of the foam gradually decreases along the direction perpendicular to the heat exchange wall. Because the pipe is a single-phase flow heat exchange, the density of the middle part of the first through-hole metal foam 9 depends on the inlet temperature, pressure and flow rate of the geothermal water. If the inlet temperature and pressure are higher, the geothermal water flow rate is larger. The pore density (more than 30PPI) of the metal foam in the middle part of the pipe is larger than...

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Abstract

The invention provides a through-hole metal foam heat exchange device with gradually varied morphologic characteristics, which makes use of the technical field of a rigid heat transfer object. The through hole in the metal foam is of a structure with density being gradually varied; the gradually varied density means that the porosity is identical and the hole density is gradually increased or decreased in the vertical direction of the wall, or the hole density is identical and the porosity is gradually increased or decreased, or both the hole density and the porosity are identical to form the gradual change of the material of the through-hole metal foam. By adopting a metal framework with the density being gradually varied, which is fired on the heat exchange wall, the method has the advantages that the heat exchange performance of the heat exchanger is improved, a traditional heat exchange fin is replaced, the specific surface area of the heat exchange is enlarged, the fluidity and heat exchange of flows gradually expanded because of being heated are benefited, the heat exchange efficiency of the heat exchanger in the same heat exchange effect circumstance is higher, the metal consumption is lower, and the volume is smaller.

Description

technical field [0001] The invention relates to a device utilizing the technical field of rigid heat transfer bodies, in particular to a through-hole metal foam with gradual deformation characteristics, a preparation method thereof, and a heat exchange device based on the metal foam. Background technique [0002] Tubular heat exchangers are used to exchange heat for fluids flowing inside and outside the tubes, and are widely used in nuclear power, refrigeration, coal power and other fields. In recent years, with the country and society's emphasis on energy conservation and emission reduction, how to make full use of existing energy has become a top priority. To improve the heat exchange efficiency of the tubular heat exchanger and reduce the volume of the tubular heat exchanger is one of the key links. Through-hole metal foam is a new type of porous material with a large specific surface area for heat transfer (2000-10000m 2 / m 3 ), low relative density (2%-12% of solid m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08B22C9/04F28F21/08
Inventor 徐治国赵长颖王美琴
Owner SHANGHAI JIAO TONG UNIV
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