CN101929821B - Open-cell metal foam porous threaded pipe - Google Patents
Open-cell metal foam porous threaded pipe Download PDFInfo
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- CN101929821B CN101929821B CN2010102462238A CN201010246223A CN101929821B CN 101929821 B CN101929821 B CN 101929821B CN 2010102462238 A CN2010102462238 A CN 2010102462238A CN 201010246223 A CN201010246223 A CN 201010246223A CN 101929821 B CN101929821 B CN 101929821B
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Abstract
The invention relates to an open-cell metal foam porous threaded pipe. The open-cell metal foam porous threaded pipe comprises a metal circular pipe and internal thread open-cell foam formed on the inner wall of the metal circular pipe; and external thread open-cell foam is formed on the outer wall of the metal circular pipe. As metal open-cell foam threads are formed on both the inner and outer sides of the metal circular pipe, the convection heat exchange area and the vaporization core are increased, and the heat exchange efficiency is further improved; moreover, the open-cell metal foam porous threaded pipe overcomes the shortcomings of uneven heat exchange caused by inconsistent wall thickness and excessively large flow resistance caused by excessively thick metal foam, and improves the heat exchange effect of a heat exchange pipe.
Description
Technical field
The present invention relates to a kind of efficient bilateral thermoexcell, be specifically related to a kind of open-cell metal foam porous threaded pipe.
Background technology
In the technology of existing augmentation of heat transfer, to the single-phase convection heat exchange, its thermal resistance mainly concentrates on laminar sublayer, and the main mode of augmentation of heat transfer is to manage to reduce laminar sublayer thickness and increase its turbulence level; To the boiling heat transfer that phase transformation is arranged, the main method that strengthens its heat transfer is to increase the nucleus of boiling of boiling heat transfer and increase the speed that bubble generates and breaks away from.
Aspect the heat exchange property that improves heat exchanger, experts and scholars both domestic and external have done big quantitative analysis, and main direction of studying is to improve heat transfer coefficient.Enhance heat transfer can realize through increasing heat transfer area, under the constant situation of equipment size, increases heat transfer area and mainly realizes through increasing fin and reasonable Arrangement.Because the metal foam particular performances, the advantage that heat transfer efficiency is high, specific area is big, density is little can significantly increase heat exchange area, reduces the reaction heat loss.
Patent 200610104597.x has proposed a kind of double-pipe metal foam heat exchanger, increases heat exchange surface through the metal foam of filling certain porosity, hole density, improves heat exchange efficiency.But, all fill metal foam in the pipe whole system resistance is increased, bubble can not in time be escaped when the existence of the metal foam layers of thickness made boiling heat transfer continuously in addition, reduced heat exchange efficiency.
Summary of the invention
The forced convertion effect that can give full play to screwed pipe that the object of the present invention is to provide fields such as a kind of air-conditioning, refrigeration and chemical industry to use; Reduce the thickness of laminar sublayer; Increase the turbulence level of fluid; Making full use of porous foam again increases the nucleus of boiling, reduces the boiling degree of superheat, and resistance has the open-cell metal foam porous threaded pipe of augmentation of heat transfer advantage for a short time.
For achieving the above object, the technical scheme that the present invention adopts is: comprise metal circular tube and the internal thread through hole metal foam that on this metal circular tube internal perisporium, forms, on the periphery wall of metal circular tube, also be formed with the external screw thread open-pore metal foam.
The female end position of the external screw thread metal throuth hole foam on the position, protruding end of the internal thread through hole metal foam on the metal circular tube internal perisporium of the present invention and the metal circular tube periphery wall is corresponding, and the position at the place, external screw thread open-pore metal foam protruding end on the periphery wall of the female end position of the internal thread through hole metal foam on the metal circular tube internal perisporium and pipe is corresponding; Internal thread through hole metal foam that forms on the metal circular tube internal and external peripheral wall and external screw thread open-pore metal foam are the horizontal thread of 5～20 degree, and lead angle is opposite; Its spiral foam rib height of internal thread through hole metal foam and external screw thread open-pore metal foam is 0.1mm～3.0mm, and width is 0.1mm～2.0mm, and the width of groove is 0.1mm～3.0mm; The rib drift angle of internal thread through hole metal foam and external screw thread open-pore metal foam is 25～45 degree; The porosity of internal thread through hole metal foam and external screw thread open-pore metal foam is 30～95%, and the aperture is 0.05～3.0mm; The open-pore metal foam of metal circular tube surfaces externally and internally is welded on the surfaces externally and internally of metal circular tube, on open-pore metal foam, is processed to form the tapped through hole metal foam then; The material of metal circular tube is copper, aluminium or stainless steel, and described internal and external screw thread open-pore metal foam material is identical with the material of metal circular tube.
The present invention adopts the porous foam screwed pipe both to overcome screwed pipe in the inapparent weakness of nucleate boiling heat-transfer effect, has given full play to the forced convertion effect of screwed pipe again, has reduced the thickness of laminar sublayer, has increased the turbulence level of fluid; Making full use of porous foam again increases the nucleus of boiling, reduces the boiling degree of superheat, the advantage of augmentation of heat transfer, and the flow resistance increase of the froth bed of the screw type of suitable thickness surface working medium neither be very remarkable simultaneously.
Description of drawings
Fig. 1 is the structural representation of porous foam screwed pipe of the present invention;
Fig. 2 is the partial enlarged drawing of Fig. 1.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Traditional pipe heat exchanger generally is made up of heat exchanger tube, enhancing heat exchange element and auxiliary heat-exchanger rig; Wherein strengthening heat exchange element can be arranged in the heat exchanger tube and/or outside the pipe; As be arranged in heat exchanger tube outer aluminium foil, fin, and be arranged in the flow-disturbing fuse in the heat exchanger tube, can strengthen heat exchange.As heat exchange element, the special performance of metal foam high thermal conductivity coefficient, high-specific surface area makes the heat exchange efficiency of heat exchanger improve greatly.
Referring to Fig. 1; 2; The porosity that the present invention includes copper pipe 1 and be welded on copper pipe 1 surfaces externally and internally is 30～95%, and the aperture is the copper vias metal foam of 0.05～3.0mm, on the open-pore metal foam of copper pipe 1 surfaces externally and internally, is processed to form the screw thread foam then; The internal thread foam 2 that promptly on copper pipe 1 internal perisporium, forms also is formed with external screw thread open-pore metal foam 3 on the periphery wall of copper pipe 1; The female end position of the external screw thread open-pore metal foam 3 on the position, protruding end of the internal thread through hole metal foam 2 on the described copper pipe internal perisporium and the periphery wall of copper pipe is corresponding; And the position at place, external screw thread open-pore metal foam 3 protruding ends on the periphery wall of the female end position of the internal thread through hole metal foam 2 on the copper pipe internal perisporium and copper pipe is corresponding; Internal thread through hole metal foam 2 and the external screw thread open-pore metal foam 3 that forms on the copper pipe internal and external peripheral wall is the horizontal thread of 5～20 degree, and lead angle is opposite; The spiral foam rib height of internal thread through hole metal foam 2 and external screw thread open-pore metal foam 3 is 0.1mm～3.0mm, and width is 0.1mm～2.0mm, and the width of groove is 0.1mm～3.0mm; The rib drift angle of internal thread through hole metal foam 2 and external screw thread open-pore metal foam 3 is 25～45 degree.The concrete size of pipe is looked applying working condition and is decided.The present invention combines porous media and screwed pipe, makes full use of the advantage of these two kinds of pipe augmentation of heat transfers, has strengthened single-phase and the phase transformation flowing heat transfer, has strengthened the heat exchange effect.
Foam screwed pipe of the present invention had both made that tube fluid rotated, and produced strong Secondary Flow, during boiling heat transfer; Metal foam porous surface makes the nucleus of boiling increase; The generation bubbles number increases, and the bubble of generation can be able to timely disengaging, escape through the groove of screw type, thereby the nucleate boiling coefficient of heat transfer is improved; Reduced the boiling degree of superheat, the onset of boiling degree of superheat only has 2 deg.c.Position, inwall internal thread foam protruding end is corresponding with the female end position of the external screw thread foam of pipe on the periphery wall, can improve the uniformity of heat-transfer pipe two side liquid heat exchange thermal conduction resistances.Therefore, the heat-transfer pipe heat exchange efficiency of being invented is high, can be widely used in the industrial circle of multiple single-phase convection heat-transfer or boiling phase-change heat transfer.
Claims (8)
1. open-cell metal foam porous threaded pipe, it is characterized in that: the internal thread through hole metal foam (2) that comprises metal circular tube (1) and on this metal circular tube internal perisporium, form also is formed with external screw thread open-pore metal foam (3) on the periphery wall of metal circular tube.
2. open-cell metal foam porous threaded pipe according to claim 1; It is characterized in that: the female end position of the external screw thread metal throuth hole foam (3) on the position, protruding end of the internal thread through hole metal foam (2) on the described metal circular tube internal perisporium and the metal circular tube periphery wall is corresponding, and the position at the place, external screw thread open-pore metal foam (3) protruding end on the periphery wall of the female end position of the internal thread through hole metal foam (2) on the metal circular tube internal perisporium and pipe is corresponding.
3. open-cell metal foam porous threaded pipe according to claim 1; It is characterized in that; Internal thread through hole metal foam (2) that forms on the described metal circular tube internal and external peripheral wall and external screw thread open-pore metal foam (3) are the horizontal thread of 5～20 degree, and lead angle is opposite.
4. open-cell metal foam porous threaded pipe according to claim 1; It is characterized in that: the high 0.1mm～3.0mm of being of its spiral foam rib of described internal thread through hole metal foam (2) and external screw thread open-pore metal foam (3); Width is 0.1mm～2.0mm, and the width of groove is 0.1mm～3.0mm.
5. open-cell metal foam porous threaded pipe according to claim 1 is characterized in that: the rib drift angle of said internal thread through hole metal foam (2) and external screw thread open-pore metal foam (3) is 25～45 degree.
6. open-cell metal foam porous threaded pipe according to claim 1 is characterized in that: the porosity of described internal thread through hole metal foam (2) and external screw thread open-pore metal foam (3) is 30～95%, and the aperture is 0.05～3.0mm.
7. open-cell metal foam porous threaded pipe according to claim 1; It is characterized in that: the open-pore metal foam of described metal circular tube surfaces externally and internally is welded on the surfaces externally and internally of metal circular tube, on open-pore metal foam, is processed to form the tapped through hole metal foam then.
8. open-cell metal foam porous threaded pipe according to claim 7 is characterized in that: the material of described metal circular tube is copper, aluminium or stainless steel, and described internal and external screw thread open-pore metal foam material is identical with the material of metal circular tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102462238A CN101929821B (en) | 2010-08-05 | 2010-08-05 | Open-cell metal foam porous threaded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102462238A CN101929821B (en) | 2010-08-05 | 2010-08-05 | Open-cell metal foam porous threaded pipe |
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| Publication Number | Publication Date |
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| CN101929821A CN101929821A (en) | 2010-12-29 |
| CN101929821B true CN101929821B (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102462238A Expired - Fee Related CN101929821B (en) | 2010-08-05 | 2010-08-05 | Open-cell metal foam porous threaded pipe |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182542B (en) * | 2011-03-31 | 2012-11-21 | 常州常瑞天力动力机械有限公司 | Condenser pipe of internal combustion engine |
| CN102829667A (en) * | 2012-09-11 | 2012-12-19 | 天津大学 | Foam metal heat exchange tube |
| CN104930888A (en) * | 2014-03-18 | 2015-09-23 | 江苏格业新材料科技有限公司 | Method for manufacturing miniature heat pipe by employing ultrathin foamed silver as wick |
| CN105241214A (en) * | 2015-10-29 | 2016-01-13 | 天津市国民制药机械有限公司 | Novel heat pump cooling device |
| CN112013705A (en) * | 2019-05-28 | 2020-12-01 | 上海潓美医疗科技有限公司 | Radiator and hydrogen generator with radiating function |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0961079A (en) * | 1995-08-23 | 1997-03-07 | Hitachi Cable Ltd | Heat exchanger and method for manufacturing heat exchanger |
| JP2000320997A (en) * | 1999-05-14 | 2000-11-24 | Osaka Gas Co Ltd | Surface modifying method, surface modified product, heating tube for evaporator and absorbing refrigerating machine |
| JP2001050688A (en) * | 1999-08-11 | 2001-02-23 | Osaka Gas Co Ltd | Surface reforming method, and surface-reformed item, and heat conductive pipe for evaporator, and absorption refrigerator |
| CN2762049Y (en) * | 2004-12-28 | 2006-03-01 | 北京广厦新源石化设备开发有限公司 | Heat exchange pipe with metal porous high flux coating on surface |
| CN100516756C (en) * | 2006-09-18 | 2009-07-22 | 西安交通大学 | Double-pipe metal foam heat exchanger |
| CN101738124A (en) * | 2009-12-04 | 2010-06-16 | 上海化工研究院 | Inner fin externally sintered porouslayer heat exchange tube |
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- 2010-08-05 CN CN2010102462238A patent/CN101929821B/en not_active Expired - Fee Related
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| CN101929821A (en) | 2010-12-29 |
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Granted publication date: 20120104 Termination date: 20200805 |