CN104266531B - A kind of multi-channel structure with metal foam uniform distribution fluid flow - Google Patents
A kind of multi-channel structure with metal foam uniform distribution fluid flow Download PDFInfo
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- CN104266531B CN104266531B CN201410528052.6A CN201410528052A CN104266531B CN 104266531 B CN104266531 B CN 104266531B CN 201410528052 A CN201410528052 A CN 201410528052A CN 104266531 B CN104266531 B CN 104266531B
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Abstract
A kind of multi-channel structure with metal foam uniform distribution fluid flow, relates to a kind of heat exchanger multi-channel structure.The present invention is to solve the uneven problem that flows between multichannel in existing heat exchanger.The multi-channel structure with metal foam uniform distribution fluid flow of the present invention is sequentially communicated by flow channel entry point, distribution end, main channel, merging end and runner exit, multiple channel spacing is set in main channel main channel is divided into several subchannels, the equal filler metal foam in front end of each subchannel constitutes metal foam section, and the subchannel component being not filled by metal foam is defined as non-foam section.The present invention is used in the multi-channel heat exchanger of electronic device cooling, refrigeration low-temperature technology, air separation, field of petrochemical industry, it is ensured that the uniformity of fluid flowing.
Description
Technical field
The present invention relates to a kind of heat exchanger multi-channel structure, it is specifically related to a kind of multi-channel structure with metal foam uniform distribution fluid flow, separate for electronic device cooling, refrigeration low-temperature technology, air, in the multi-channel heat exchanger of field of petrochemical industry, belong to heat and mass applied technical field.
Background technology
Electronic device cooling, refrigeration low-temperature technology, air are separated, the heat exchangers of field of petrochemical industry, it usually needs multiple heat exchangers are parallel, and each heat exchanger channels assignment of traffic is uneven will cause that heat exchanger heat-transfer performance worsens.
For refrigerated air-conditioning system, condenser and vaporizer are generally made up of several parallel many flat tubes passage of upper lower header and centre, although these many flat tubes channel geometry are of substantially equal, but owing to there is the tolerance and flox condition lack of uniformity manufactured and designed, the flow of the many flat tubes passage being generally proximal to condenser both sides is less, and center-aisle flow is relatively big, this severely limits the usefulness of condensing heat-exchange；Sometimes the problem that there is also biphase entrance in condenser and vaporizer, ensures that at refrigerant inlet place two phase refrigerant fluid uniformly enters heat exchanger channels and becomes the important leverage of system heat transfer performance.
In heat exchanger, the flowing non-uniform phenomenon between multichannel is a complicated physical process within multi-channel heat exchanger, it is limited by factors, except manufacturing and designing the inevitable factors such as tolerance, the heat exchanger uneven characteristic of flowing can be improved by the harmony of enhancing fluid flow conditions, in current document, correlational study is concentrated mainly on header, end socket and channel flow form optimize three aspects, and relevant fluid uniform distribution limited efficiency.
Rising in recent years one class has excellent flowing, heat transfer, acoustics, electromagnetism and mechanical property in porous metal foam material integrally, this kind of material does not only have the feature reducing fluid cross-section temperature contrast, and there is high current body mixed, strong turbulence characteristic and 3 D stereo pore structure, these features make fluid boundary VELOCITY DISTRIBUTION present highly uniform state, and then produce the flow resistance much larger than optical channel.In multi-channel heat exchanger, flow irregularity is caused more greatly by resistance difference between each passage, it is possible to the metal foam with big pressure reduction is used for the flow irregularity overcome in multi-channel heat exchanger, and this kind of research there is no people and relates to.
Summary of the invention
The present invention is to solve the uneven problem that flows between multichannel in existing heat exchanger, and then a kind of multi-channel structure with metal foam uniform distribution fluid flow is provided.
The present invention is to solve that above-mentioned technical problem is adopted the technical scheme that:
A kind of multi-channel structure with metal foam uniform distribution fluid flow of the present invention, including flow channel entry point, distribution end, main channel, merging end and runner exit, described flow channel entry point, distribution end, main channel, merging end and runner exit are sequentially communicated, multiple channel spacing is set in main channel main channel is divided into several subchannels, the equal filler metal foam in front end of each subchannel constitutes metal foam section, and the subchannel component being not filled by metal foam is defined as non-foam section.
The present invention keeps flow equalization by the metal foam filling drag characteristic equal in the porch of each subchannel.
Described flow channel entry point is identical with the fluid flow direction of runner exit, and is perpendicular to fluid flow direction in each subchannel.
In order to better ensure that the uniformity of flow distribution of fluid, technical scheme is designed further: described distribution end adopts the width gradual change type circulation adapting to fluid flow, is gradually reduced along flow channel entry point flow direction distribution end circulation area.Merging end adopts the width gradual change type circulation adapting to fluid flow, is gradually increased along runner exit flow direction merging end circulation area.
The material of metal foam section is copper, aluminum, nickel, ferrum and alloy thereof, it is preferred that for rustless steel.
The porosity ranges of metal foam section is 0.85～0.99, and hole density range is 5PPI～150PPI.
Metal foam segment length L1With non-foam segment length L2Ratio range 0.05 < Lr< 1, Lr=L1/L2。
In each subchannel described, the porosity of metal foam, hole density, length and installation site are all identical, and the sectional dimension of metal foam is identical with the sectional dimension of subchannel to guarantee effective installation.
Physical dimension and the wall material of each subchannel are identical.
The present invention compared with prior art has the effect that
The flow resistance coefficient that in n flow channel, each passage is corresponding before filler metal foam respectively f1, f2, f3, ..., owing to the difference of design and flox condition can be different between fn, f1～fn, this is the main cause causing this kind of multichannel flow irregularity.The way arranging header at multichannel entrance of abandoning tradition, the method that employing fills the equal metal foam section of drag characteristic at each feeder connection improves flow equalization, the width gradual change type circulation of distribution end and merging end employing adaptation fluid flow.After adding the metal foam of identical parameters, the resistance coefficient of each passage becomes f1',f2',f3',...,fn', wherein fk'=fk+ffoam(k=1,2,3..., n), ffoamFor the resistance coefficient of metal foam, about optical channel be filled up completely with the pressure drop ratio of metal foam passage and can be seen that optical channel is about the 1/2000 of metal foam channel pressure drop from Fig. 2, therefore fk'≈ffoam(k=1,2,3..., n), when foam parameters is equal, the drag characteristic of each passage is of substantially equal, and this is the ultimate principle of the present invention.It is owing to metal foam has extremely strong fluid mixed, can the speed difference of floating cross section upper fluid to a great extent, Fig. 3 gives the VELOCITY DISTRIBUTION contrast of metal foam passage and optical channel, as can be seen from the figure the VELOCITY DISTRIBUTION adding metal foam passage is extremely uniform, and this is the reason that there is significant pressure drop in metal foam.It is removable for adding metal foam, and there is certain filter capacity, can the impurity in Filtration Adsorption working medium to a certain extent, it is possible to eliminate the harmful effect to system miscellaneous part of the working medium impurity, therefore can remove the impurity of surface adsorption by regularly replacing metal foam section.Metal foam section has certain reinforcing heat exchange capability, heat-transformation can be strengthened by a relatively large margin, in multi-channel heat exchanger, metal foam can provide part heat exchange surface area for each passage, can be smashed by air pocket for two phase flow metal foam, therefore that the heat transfer property improving multi-channel heat exchanger is favourable.Additionally, non-foam section can be straight optical channel, it is also possible to be the passage adopting certain enhanced heat exchange form, and the morphological parameters of metal foam can be adjusted according to actual needs, and therefore the present invention has good designability.
Visible, multi-channel heat exchanger flow irregularity has been carried out the innovation of the principles of science by the present invention, and the present invention also has other miscellaneous function simultaneously, principle and be technically all feasible, has good application potential.The problem that the flow distribution of fluid of the multi-channel heat exchanger of electronic device cooling, refrigeration low-temperature technology, air separation, field of petrochemical industry is uneven can be solved.
Accompanying drawing explanation
Fig. 1 is the structure chart of the multi-channel structure with metal foam uniform distribution fluid flow；
Fig. 2 is the pressure drop comparison diagram of foam passages and optical channel；
Fig. 3 is metal foam and optical channel VELOCITY DISTRIBUTION comparison diagram；
In figure: 1-flow channel entry point；2-distribution end；3-metal foam section；4-non-foam section；5-channel spacing；6-merging end；7-runner exit.
Detailed description of the invention
Detailed description of the invention one: illustrate in conjunction with Fig. 1, a kind of multi-channel structure with metal foam uniform distribution fluid flow of present embodiment, including flow channel entry point 1, distribution end 2, main channel, merging end 6 and runner exit 7, described flow channel entry point 1, distribution end 2, main channel, merging end 6 and runner exit 7 are sequentially communicated, multiple channel spacing 5 is set in main channel main channel is divided into several subchannels, the equal filler metal foam in front end of each subchannel constitutes metal foam section 3, and the subchannel component being not filled by metal foam is defined as non-foam section 4.
The present invention keeps flow equalization by the metal foam filling drag characteristic equal in the porch of each subchannel.
Described flow channel entry point 1 is identical with the fluid flow direction of runner exit 7, and is perpendicular to fluid flow direction in each subchannel.
In order to better ensure that the uniformity of flow distribution of fluid, technical scheme is designed further: described distribution end 2 adopts the width gradual change type circulation adapting to fluid flow, is gradually reduced along flow channel entry point 1 flow direction distribution end 2 circulation area.Merging end 6 adopts the width gradual change type circulation adapting to fluid flow, is gradually increased along runner exit 7 flow direction merging end circulation area.
The material of metal foam section is copper, aluminum, nickel, ferrum and alloy thereof, it is preferred that for rustless steel.
The porosity ranges of metal foam section is 0.85～0.99, and hole density range is 5PPI～150PPI.
Metal foam segment length L1With non-foam segment length L2Ratio range 0.05 < Lr< 1, Lr=L1/L2。
In each subchannel described, the porosity of metal foam, hole density, length and installation site are all identical, and the sectional dimension of metal foam is identical with the sectional dimension of subchannel to guarantee effective installation.
Physical dimension and the wall material of each subchannel are identical.
The present invention is absent from header at multichannel entrance, the fluid being suitable for is two-phase fluid or monophasic fluid, if for the assignment of traffic of two-phase fluid, for ensureing the harmony of mean flow rate and mass dryness fraction between each passage, each passage of multi-channel heat exchanger should horizontal Tile to eliminate the impact of gravity.The concrete arrangement form of the present invention can be various, but the Concurrent Feature between multichannel is constant, and the cross sectional shape of each subchannel, size and enhanced heat exchange form are arbitrary, and the number of middle parallel port is also arbitrary.Specific works process is: single-phase or two-phase fluid flows into from flow channel entry point 1, assignment of traffic is carried out in the distribution end 2 become narrow gradually, fluid enters each subchannel, each subchannel front end is filled with metal foam section 3, fluid passes sequentially through metal foam section 3 and non-foam section 4, then the fluid of each passage converges at the merging end 6 broadened gradually, finally flows out runner exit 7.
Present embodiment is the exemplary illustration to this patent, does not limit its protection domain, and its local can also be changed by those skilled in the art, as long as no the spirit beyond this patent, all in the protection domain of this patent.
Claims (7)
1. one kind with the multi-channel structure of metal foam uniform distribution fluid flow, including flow channel entry point (1), distribution end (2), main channel, merging end (6) and runner exit (7), described flow channel entry point (1), distribution end (2), main channel, merging end (6) and runner exit (7) are sequentially communicated, multiple channel spacing (5) is set in main channel main channel is divided into several subchannels, it is characterized in that: the equal filler metal foam in front end of each subchannel constitutes metal foam section (3), the subchannel component being not filled by metal foam is defined as non-foam section (4)；Described distribution end (2) adopts the width gradual change type circulation adapting to fluid flow, is gradually reduced along flow channel entry point (1) flow direction distribution end (2) circulation area；Merging end (6) adopts the width gradual change type circulation adapting to fluid flow, is gradually increased along runner exit (7) flow direction merging end circulation area.
2. a kind of multi-channel structure with metal foam uniform distribution fluid flow according to claim 1, it is characterized in that: described flow channel entry point (1) is identical with the fluid flow direction of runner exit (7), and is perpendicular to fluid flow direction in each subchannel.
3. a kind of multi-channel structure with metal foam uniform distribution fluid flow according to claim 1, it is characterised in that: the material of metal foam section is copper, aluminum, nickel, ferrum and alloy thereof.
4. a kind of multi-channel structure with metal foam uniform distribution fluid flow according to claim 3, it is characterised in that: the porosity ranges of metal foam section is 0.85～0.99, and hole density range is 5PPI～150PPI.
5. a kind of multi-channel structure with metal foam uniform distribution fluid flow according to claim 1,2,3 or 4, it is characterised in that: metal foam segment length L1With non-foam segment length L2Ratio range 0.05 < Lr< 1, Lr=L1/L2。
6. a kind of multi-channel structure with metal foam uniform distribution fluid flow according to claim 5, it is characterized in that: in each subchannel described, the porosity of metal foam, hole density, length and installation site are all identical, and the sectional dimension of metal foam is identical with the sectional dimension of subchannel.
7. a kind of multi-channel structure with metal foam uniform distribution fluid flow according to claim 6, it is characterised in that: physical dimension and the wall material of each subchannel are identical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410528052.6A CN104266531B (en) | 2014-10-09 | 2014-10-09 | A kind of multi-channel structure with metal foam uniform distribution fluid flow |
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| CN201410528052.6A CN104266531B (en) | 2014-10-09 | 2014-10-09 | A kind of multi-channel structure with metal foam uniform distribution fluid flow |
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| CN104266531A CN104266531A (en) | 2015-01-07 |
| CN104266531B true CN104266531B (en) | 2016-06-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6831120B2 (en) * | 2016-01-21 | 2021-02-17 | エタリム インコーポレイテッド | Equipment and systems for heat exchange with fluids |
| DE102016004715A1 (en) * | 2016-04-19 | 2017-10-19 | Oerlikon Textile Gmbh & Co. Kg | Apparatus for cooling an annular extruded filament bundle |
| KR102343408B1 (en) * | 2017-11-17 | 2021-12-27 | 주식회사 엘지화학 | Heat exchanger |
| CN108131982B (en) * | 2018-01-30 | 2023-11-03 | 江苏唯益换热器有限公司 | Fluid distributor using foam metal and plate heat exchanger comprising same |
| CN111120056A (en) * | 2019-12-06 | 2020-05-08 | 天津大学 | Noise elimination type thermoelectric generation system heat exchanger with metal foam structure |
| CN113198384B (en) * | 2021-05-08 | 2022-08-19 | 华东理工大学 | Fluid mixer with heat exchange channel and fluid mixing method |
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| CN101111734A (en) * | 2005-02-02 | 2008-01-23 | 开利公司 | Parallel flow heat exchangers incorporating porous inserts |
| CN201935485U (en) * | 2011-02-23 | 2011-08-17 | 天津三电汽车空调有限公司 | Concurrent flow heat exchanger used for heat pump |
| CN102313400A (en) * | 2011-07-21 | 2012-01-11 | 广东美的电器股份有限公司 | Microchannel parallel-flow heat exchanger |
| CN202613846U (en) * | 2012-05-09 | 2012-12-19 | 广东美的电器股份有限公司 | Parallel flow heat exchanger |
| CN103502763A (en) * | 2011-05-06 | 2014-01-08 | 三菱电机株式会社 | Heat exchanger and refrigeration cycle device provided with same |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101111734A (en) * | 2005-02-02 | 2008-01-23 | 开利公司 | Parallel flow heat exchangers incorporating porous inserts |
| CN201935485U (en) * | 2011-02-23 | 2011-08-17 | 天津三电汽车空调有限公司 | Concurrent flow heat exchanger used for heat pump |
| CN103502763A (en) * | 2011-05-06 | 2014-01-08 | 三菱电机株式会社 | Heat exchanger and refrigeration cycle device provided with same |
| CN102313400A (en) * | 2011-07-21 | 2012-01-11 | 广东美的电器股份有限公司 | Microchannel parallel-flow heat exchanger |
| CN202613846U (en) * | 2012-05-09 | 2012-12-19 | 广东美的电器股份有限公司 | Parallel flow heat exchanger |
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Effective date of registration: 20151215 Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Applicant after: Shanghai Jiao Tong University Applicant after: China Petroleum University (East China) Address before: 266580 Qingdao economic and Technological Development Zone, Changjiang Road, No. 66, Shandong Applicant before: China Petroleum University (East China) |
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