CN104949563B - A kind of terraced density metal foam heat exchanger tube - Google Patents
A kind of terraced density metal foam heat exchanger tube Download PDFInfo
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- CN104949563B CN104949563B CN201510348714.6A CN201510348714A CN104949563B CN 104949563 B CN104949563 B CN 104949563B CN 201510348714 A CN201510348714 A CN 201510348714A CN 104949563 B CN104949563 B CN 104949563B
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- metal foam
- heat exchanger
- terraced
- density
- exchanger tube
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Abstract
The present invention relates to a kind of heat exchanger tube, specifically related to a kind of terraced density metal foam heat exchanger tube, including terraced density metal foam and outer tube, the interstitial space that the terraced density metal foam is included at least two different porosities and the metal foam of hole density, the terraced density metal foam provides the passage of flow of fluid.The present invention utilizes the difference of Pore genesis between each layer of the terraced density metal foam, utilize the difference of flow resistance of the fluid between each layer metal foam, in the fluid passage close to one layer of formation high speed of outer tube wall, so as to carry out effective heat exchange to one layer close to outer tube wall.
Description
Technical field
The present invention relates to a kind of heat exchanger tube, and in particular to a kind of heat exchanger tube of filling terraced density metal foam.
Background technology
In recent years, with energy-consuming greenhouse effects adds caused by continuous growth and combustion of fossil fuel discharge
Play, the requirement more and more higher to efficiency of energy utilization, it is therefore desirable to improve constantly the heat exchange efficiency and overall performance of heat exchanger, if
Count out more energy-conservation, compact and lightweight high-efficiency heat exchanger equipment.How the heat exchange property side of heat-exchanger rig is further being improved
Face, scholar both domestic and external has made substantial amounts of research, the Main way studied at present be improve heat-exchanger rig the coefficient of heat transfer and
Increase heat transfer area.But increase heat exchange area is not the overall dimensions by increase equipment to realize, but should be from heat exchange dress
The structure of itself is put to consider.
Therefore, find a kind of efficient enhanced heat transfer mode, and with this to improve simultaneously heat-exchanger rig heat transfer coefficient and
Increase heat transfer area is the focus of researchers' research.In recent years, a kind of novel porous metal material has been developed, it has height
The excellent thermophysical property such as porosity, high osmosis, high-specific surface area, high thermal conductivity.Using metal foam filling mode
Heat-exchanger rig is by farthest increasing specific surface area using the confined space of heat transmission equipment and utilizes metal foam
Flow disturbance effect caused by skeleton, the high thermal conductivity of foaming structure itself, makes it high-efficiency heat exchanger in addition
Manufacturer and the favor object of researcher.However, the structure type of existing metal foam heat-exchanger rig is all to use single hole
Gap rate and hole density filling mode.The metal foam heat-exchanger rig of this form, when the metal using low porosity, high density holes
During foam, the flow resistance that fluid flows through heat-exchanger rig is larger；And when using high porosity, the metal foam of lower well densities,
The heat exchange property of heat-exchanger rig is again poor.
The content of the invention
In view of the drawbacks described above of prior art, filled out it is an object of the invention to provide one kind using terraced density metal foam
The heat exchanger tube filled, the terraced density refers to that graded is presented in the porosity or hole density of metal foam.
The terraced density metal foam heat exchanger tube of the present invention includes terraced density metal foam and outer tube, the terraced density metal bubble
The interstitial space that foam is included at least two different porosities and the metal foam of hole density, the terraced density metal foam is provided
The passage of flow of fluid.The terraced density metal foam is added by methods such as sintering, powder metallurgy, foaming, vapour depositions
Work is formed, it is preferred that being to be fabricated by the environment of anaerobic by high temperature sintering.The terraced density metal foam passes through anaerobic
High temperature sintering or the mode of welding are closely connected with the inwall of the outer tube, so contribute to reduce contact heat between the two
Resistance.
The porosity of the terraced density metal foam is 0.7~0.95, and hole density is 20~100PPI, and aperture is micro- tens
Rice is arrived between several millimeters.The material of the terraced density metal foam and the outer tube can be with identical, can also be different.The difference
The material of the metal foam of porosity and hole density can be with identical, can also be different, is selected generally from copper, aluminium, nickel or its alloy.Institute
The terraced density metal foam stated is higher in the side porosity close to the outer tube wall, and close to outer tube center hole
Gap rate is relatively low.
In a preferred embodiment of the invention, the terraced density metal foam includes two kinds of different porosities and Kong Mi
The metal foam of degree, the difference of its porosity is 0.1~0.15, and the difference of hole density is 20~50PPI.Wherein, porosity compared with
The thickness proportion of the high metal foam metal foam relatively low with porosity can be adjusted according to actual conditions, and for example, 1:
1、1:2 or 1:3.
Brief description of the drawings
Fig. 1 is the sectional view of a preferred embodiment of the present invention；
Fig. 2 is the structural representation of a preferred embodiment of the present invention.
Embodiment
Illustrate the concrete structure and the mode of action of the present invention below by the mode with reference to accompanying drawing.
As depicted in figs. 1 and 2, in a preferred embodiment, terraced density metal foam heat exchange tube structure of the invention
Including terraced density metal foam 1 and outer tube 2.Wherein, the terraced density metal foam 1 is by metal foam a and metal foam b
Processed by methods such as sintering, powder metallurgy, foaming, vapour depositions, its inside, which has, provides fluid media (medium) circulation
Pore channel, porosity requirement be more than 0.7, aperture between tens microns to several millimeters, fluid can the pore channel it
Between flow.The terraced density metal foam 1 is embedded in outer tube 2, the terraced density metal foam 1 be by welding, sintering or
Other similar fashions and the inwall of outer tube 2 are attached, the terraced density metal foam 1 and the close phase of the inwall of outer tube 2
Company can reduce thermal contact resistance therebetween.
As shown in figure 1, the metal foam b that porosity is higher, aperture is larger is disposed adjacent to the side of the inwall of outer tube 2,
And porosity is relatively low, the less metal foam a in aperture is placed in the center of outer tube 2, the metal foam a's and metal foam b
Thickness can be adjusted according to actual needs, such as described metal foam a and metal foam b thickness ratio is 1:1、2:1 or
3:1.In the embodiment shown in figure one, the thickness ratio is about 2:1.
The material of the outer tube 2 is generally steel or copper, and the material of the terraced density metal foam 1 can be used and outer tube 2
Identical material, it would however also be possible to employ the different material with outer tube 2.The material of the usual terraced density metal foam 1 can be selected from
Aluminium, copper, nickel or its alloy.
When heat exchanger works, fluid media (medium) used is heated or cooled from the one of the terraced density metal foam heat exchanger tube
End is flowed into, due to the special structure setting of the terraced density metal foam 1, the flow of fluid close to the inwall side of outer tube 2
Resistance is smaller, so that the fluid passage of a high speed is formed, the heat exchange effective to one layer of progress close to wall, the fluid
Medium flows out after scattering and disappearing or absorbing heat from the other end of the terraced density metal foam heat exchanger tube.
In the above-described embodiments, the outer tube 2 is shaped as circle, but in practical application in industry, its shape is not
Circle is confined to, other shapes also may be used.
Preferred embodiment of the invention described in detail above.It should be appreciated that the ordinary skill of this area is without wound
The property made work just can make many modifications and variations according to the design of the present invention.Therefore, all technical staff in the art
Pass through logic analysis, reasoning or the available technology of limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be in the protection domain being defined in the patent claims.
Claims (6)
1. a kind of metal foam heat exchanger tube, it is characterised in that the heat exchanger tube includes terraced density metal foam and outer tube, the ladder
The hole that density metal foam is included in two kinds of different porosities and the metal foam of hole density, the terraced density metal foam is empty
Between provide flow of fluid passage, wherein the porosity of the terraced density metal foam be 0.7~0.95, hole density be 20~
The difference of the porosity of the metal foam of 100PPI, described two different porosities and hole density is 0.1~0.15, hole density
Difference is 20~50PPI, and the thickness ratio of the higher metal foam of porosity and the relatively low metal foam of porosity is 1:1、1:2 or
1:3。
2. metal foam heat exchanger tube according to claim 1, wherein the terraced density metal foam is the environment in anaerobic
It is fabricated by by high temperature sintering down.
3. metal foam heat exchanger tube according to claim 1, wherein the terraced density metal foam is burnt by anaerobic high temperature
Knot or the mode of welding are closely connected with the inwall of the outer tube.
4. metal foam heat exchanger tube according to claim 1, wherein the material of the terraced density metal foam be copper, aluminium,
Nickel or its alloy.
5. metal foam heat exchanger tube according to claim 1, wherein described terraced density metal foam is close to described outer
The side porosity of inside pipe wall is higher, relatively low close to outer tube center porosity.
6. metal foam heat exchanger tube according to claim 1, wherein described two different porosities and the metal of hole density
The material of foam is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510348714.6A CN104949563B (en) | 2015-06-19 | 2015-06-19 | A kind of terraced density metal foam heat exchanger tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510348714.6A CN104949563B (en) | 2015-06-19 | 2015-06-19 | A kind of terraced density metal foam heat exchanger tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104949563A CN104949563A (en) | 2015-09-30 |
| CN104949563B true CN104949563B (en) | 2017-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510348714.6A Active CN104949563B (en) | 2015-06-19 | 2015-06-19 | A kind of terraced density metal foam heat exchanger tube |
Country Status (1)
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| CN (1) | CN104949563B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106839795B (en) * | 2017-01-25 | 2019-01-01 | 东南大学 | A kind of efficient foam metal steam condenser handled through hydrophobicity |
| WO2019152506A1 (en) * | 2018-01-31 | 2019-08-08 | The Penn State Research Foundation | Monocoque shell and tube heat exchanger |
| CN111207619B (en) * | 2020-01-15 | 2021-04-06 | 郑州轻工业大学 | Efficient boiling reinforced heat exchange tube and manufacturing method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110597A (en) * | 1990-08-29 | 1992-04-13 | Kobe Steel Ltd | Heat transfer pipe of heat exchanger |
| CN100516756C (en) * | 2006-09-18 | 2009-07-22 | 西安交通大学 | Double-pipe metal foam heat exchanger |
| CN101226021A (en) * | 2008-01-31 | 2008-07-23 | 上海交通大学 | Finned tube type heat exchanger inner lining with foam metal |
| CN101413071A (en) * | 2008-12-05 | 2009-04-22 | 西北有色金属研究院 | Metal polyporous material with gradient pore structure and preparation thereof |
| CN101839656A (en) * | 2009-03-17 | 2010-09-22 | 铜联商务咨询（上海）有限公司 | Sleeve-type efficient foam metal heat exchanger |
| CN103060592A (en) * | 2013-01-11 | 2013-04-24 | 上海交通大学 | Through-hole metal foam with gradually varied morphologic characteristics, preparation method of through-hole metal foam, and heat exchange device |
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2015
- 2015-06-19 CN CN201510348714.6A patent/CN104949563B/en active Active
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| CN104949563A (en) | 2015-09-30 |
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