CN102252549A - Liquid separating condensation pipe of capillary structure - Google Patents
Liquid separating condensation pipe of capillary structure Download PDFInfo
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- CN102252549A CN102252549A CN 201110206781 CN201110206781A CN102252549A CN 102252549 A CN102252549 A CN 102252549A CN 201110206781 CN201110206781 CN 201110206781 CN 201110206781 A CN201110206781 A CN 201110206781A CN 102252549 A CN102252549 A CN 102252549A
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Abstract
The invention belongs to the technical field of enhanced heat transfer, and relates to a liquid separating condensation pipe of a capillary structure. The liquid separating condensation pipe is structurally characterized in that: 2 to 5 wall surface capillary structure sections are connected in series at intervals along the pipe length direction in a common condensation heat exchange pipe; liquid collecting cavities encircle the outer sides of the wall surface capillary structure sections and are fixedly connected to the common condensation heat exchange pipe; the liquid collecting cavities and the wall surface capillary structure sections form capillary enhanced structure assemblies; a liquid conducting pipe is used for communicating the liquid collecting cavities of the capillary enhanced structure assemblies; and the liquid conducting pipe extends to the tail end of the common condensation heat exchange pipe and is connected with the common condensation heat exchange pipe. When steam flows through the condensation pipe and phase change is produced, the condensed liquid in the pipe is timely separated through the wall surface capillary structure sections under the action of surface tension of the liquid, and is automatically sucked to the tail end of the condensation pipe through the liquid collecting cavities and the liquid conducting pipe; and the condensation pipe radically breaks through the technical bottleneck that heat transfer is deteriorated by a thick liquid membrane formed by condensation heat transfer along the pipe length direction, is suitable for common condensation heat transfer and steam condensation occasions, and can also be promoted to condensation heat transfer under the micro gravity condition.
Description
Technical field
The invention belongs to the augmentation of heat transfer technical field, particularly a kind of capillary structure liquid division type condenser pipe.
Background technology
The condensation phase-change heat-exchanger is because the high efficiency of phase-change heat transfer is widely used in fields such as refrigeration, air-conditioning, generating, petrochemical industry.In some application scenarios, need to reduce the temperature and pressure in the condenser in the Rankine cycle such as utilizing low-grade heat source to drive in the ORC circulation as far as possible, make and condenser work under the little temperature difference (organic working medium is little with pipe outer air or cooling range in the pipe) drives cause the increase of heat exchange area and the raising of cost of investment.In fields such as refrigeration, air-conditioning, petrochemical industry, further improve condensing heat-exchange efficient simultaneously, can reduce cost significantly, have remarkable economic efficiency and social benefit.This has proposed great demand for the design of efficient condenser, manufacturing and operation.
The condensation phase transformation is important phase transition process in the two phase flow subject, the content of vapour-liquid gradually changes in the continuous evolution process of condensation process from the steam state to the liquid condensed in the pipe, makes to have presented different flow patterns such as wet steam flow, annular flow, stratified flow, slug flow, slug flow, bubble flow from full steam state to complete liquid process.Simultaneously because the continuous appearance of condensate liquid and gathering, liquid in condenser pipe from the droplet of beginning form gradually wall thin liquid film, the thick liquid film of wall to the liquid bridge at last to full liquid status.If the formation of wall condensate liquid thin liquid film during annular flow has increased the coefficient of heat transfer between vapour is solid; Must there be the optimum thickness value in that this liquid film that has certain thermal resistance simultaneously.According to domestic and international researcher's report, and reached common understanding, the annular flow of thin liquid film state has the highest heat transfer efficiency, promptly in whole condensation process along with flow pattern is converted to stratified flow, slug flow, slug flow from annular flow, liquid film gathers thick liquid film by thin liquid film even to liquid bridge state at wall, its liquid film thermal resistance significantly increases, thereby causes the present situation that the condensation process heat transfer coefficient reduces gradually, heat-transfer effect obviously worsens.Therefore the flow pattern in the condensation process develops and is only the basic reason that the condenser pipe heat exchange efficiency worsens, decays.
At present both at home and abroad enforcing condensation heat exchange aspect mainly adopts various forms of enhanced tubes, as little finned tube, groove pipe, bellows tube, and the enhanced tube of insert is installed.From strengthening effect, little finned tube is by the blending that strengthens condensate film, the disturbance that causes tube fluid, and is general more obvious than the strengthening effect of groove pipe, the condensation coefficient of plain tube can be improved 80～180%.And for the groove pipe of differing tilt angles, and its strengthening effect is subjected to the influence of matter flow velocity degree, and matter speed is big more, condensate liquid is derived soon more, and strengthening effect is obvious more.The node enhanced tube generally can improve 50% with the heat transfer coefficient of plain tube; Insert the enhanced tube of double helix silk structure in addition in the pipe, also can significantly strengthen condensing heat-exchange in the VERTICAL TUBE.But, the present condensation enhanced tube that adopts, all fail to notice the condensation flow pattern variation, develop at all from flow pattern, and just by causing rotating flow, secondary stream, make core flow and tube wall fluid produce displacement, destroy development of boundary layer, thereby strengthen in-tube condensation.Have following common ground: (1) inwall fine structure has mainly changed flowing and heat transfer property of near wall region, can not regulate and control flow pattern on the whole.(2) though inner-wall reinforced structure has strengthening effect and the differentiation feature of heat exchange property decay on the unresolved condenser pipe length direction.(3) enhanced tube has increased manufacture difficulty, and the condenser cost increases.
2007, Tsing-Hua University's phase transformation and interface are transmitted laboratory professor Peng Xiaofeng whole in-tube condensation are approximately the thin liquid film condensation, according to Nu Saier laminar flow, film condensation analytic solution know that the condensing heat-exchange thickness of liquid film is directly proportional with 1/4 power of pipe range, 1/4 power of average surface heat transfer coefficient and whole pipe range is inversely proportional to, quantitative announcement the objective fact that decays with the increase of heat exchanger tube length of condensation coefficient; And utilize the short tube effect, and give up the follow-up low heat transfer flow pattern of condensing heat-exchanging pipe, keep initial procedure high heat-transfer performance flow pattern; The vapour phase that obtains after utilizing gravity with vapor-liquid separation the short tube outlet simultaneously enters next short tube again and continues condensation, and the method that makes the condensation flow pattern maintain annular flow has all the time significantly improved the heat transfer efficiency of condensing heat-exchanging pipe.It is based on the understanding to each flow pattern heat transfer property of condensation, from the angle augmentation of heat transfer of condensation scientific process; But its starting point is directly to avoid the flow pattern of heat-transfer effect difference, shortens heat exchanger tube length; Simultaneously, the method for utilizing gravity to carry out vapor-liquid separation makes that the design of condenser under the different angle heat exchanger must be different, and the application under microgravity condition has certain limitation.
In sum, significantly improving condensation heat transfer efficient must be from the physical process of condensation, the regulation and control flow pattern, could fundamentally improve its heat exchange property, solve the present situation that it worsens along pipe range, need be a kind of according to the feature that liquid film in the flow pattern evolution process thickens, thermal resistance increases, by science regulation and control flow pattern, fundamentally improve the method and the technology of the high-efficiency condensation heat exchanger tube of condensing heat-exchange efficient.
Summary of the invention
The objective of the invention is to change and ignore flow pattern and the situation of conducting heat and separating in traditional intensified heat transfer method, solve the key issue that condensation phase-change heat transfer process runs down, a kind of capillary structure liquid division type condenser pipe is provided, it is characterized in that, capillary structure liquid division type condenser pipe is by common condensing heat-exchanging pipe 1, wall capillary structure section 2, liquid collecting cavity 3 and catheter 4 are formed, its structure is connected in series 2～5 wall capillary structure sections 2 at interval for the pipe range direction along common steam condenser pipe 1, liquid collecting cavity 3 surrounds wall capillary structure section 2 outsides and is fixed on the common condensing heat-exchanging pipe 1, liquid collecting cavity 3 and wall capillary structure section 2 constitute capillary reinforced structure assembly, each liquid collecting cavity 3 of organizing capillary reinforced structure assembly links to each other with catheter 4, and the end of catheter 4 links to each other with condenser pipe is terminal.
Described common condensing heat-exchanging pipe 1 is light pipe, the finned tube with extended surface, groove pipe or bellows tube, by realizing steam condensation in the pipe with the outer working medium heat exchange of pipe.
The axial cross section of described liquid collecting cavity 3 is rectangle or semicircle.
Described wall capillary structure section 2, during by working medium condensation phase transformation in the flow pattern development law distribution of annular flow, semicircular stream, slug flow or slug flow and length thereof determine the position and the area of wall capillary structure section, the wall capillary structure section 2 of first group of capillary reinforced structure assembly is arranged on the thick liquid film place before the annular flow end in the pipe, since second group, the wall capillary structure section 2 of adjacent set capillary reinforced structure assembly is the length of slug flow or slug flow vapour bullet in axial distance, to eliminate or to weaken the liquid bridge thermal resistance of slug flow, the regulation and control flow pattern, augmentation of heat transfer; The liquid collecting amount that need be derived by the part is determined the circumferential distribution of capillary structure, for example, because second group of capillary reinforced structure assembly of respectively organizing after reaching need be derived the liquid of whole liquid bridge, therefore the wall capillary structure section 2 capillary hole counts of first group of capillary reinforced structure assembly are less than the wall capillary structure section 2 capillary hole counts of second group of capillary reinforced structure assembly of respectively organizing after reaching.
The pore diameter or the equivalent diameter of the wall capillary structure of described wall capillary structure section 2 are calculated by following formula:
Wherein σ is that condensate liquid surface tension, g are acceleration of gravity, ρ
fBe condensate liquid density, ρ
gBe vapour phase density, i.e. condensation working medium surface tension is big, the slightly larger in diameter of pore, on the contrary smaller, water for example, the diameter of pore is between 1～2mm, but the pore diameter analogy of corresponding different working medium and mixture.
The wall capillary structure of described wall capillary structure section 2 is wall pore type structure, wall slit 205 type structures, porous foam type structure or wall silk screen type structure.
The wall micropore 201 of the wall pore type structure of described wall capillary structure section 2 is circular hole or the square hole that evenly distributed or non-homogeneous arrangement has different apertures, the wall micropore 201 circumferential distribution densities of each section after first section wall micropore 201 circumferential distribution densities reach less than second section.
The wall slit 205 of the wall slit-type structure of described wall capillary structure section 2 has the slit of identical or different width for parallel, staggered or cross modal distribute, the circumferential distribution density of wall slit of each section after first section the circumferential distribution density of wall slit reaches less than second section.
The porous foam type structure of described wall capillary structure section 2 is each section porous foam ring length after 204, the first sections porous foam ring lengths of porous foam ring reach less than second section.
The material of described porous foam ring 204 is foam metal or foamed ceramics.
The wall silk screen type structure of described wall capillary structure section 2 is made up of the circular hole on the tube wall that is open at common condensing heat-exchanging pipe 1 202 woven wire 203 outer with being coated on circular hole, the circumferential number of each section circular hole after the circumferential number of first section circular hole reaches less than second section.
The novel condensation enhanced tube that the present invention is conducted heat mutually for a kind of enforcing condensation, physical process from condensation, control from flow pattern, increase substantially the efficient of condensation phase-change heat transfer, to improve flow new thought with heat transfer property of complete condensation heat transfer, provide a kind of a kind of novel capillary structure liquid division type condenser pipe that is different from the short tube effect described in the background technology, Gravity Separation based on regulation and control condensation heat transfer flow pattern.Capillary structure liquid division type condenser pipe promptly is provided with wall capillary structure section at common condensing heat-exchanging pipe local wall, liquid collecting cavity and catheter are set to store also transporting in time by the isolated condensate liquid of loose structure in wall capillary structure section periphery, thereby attenuate liquid film, reduce the liquid film thermal resistance, even stratified flow, slug flow condensation flow pattern be converted to the annular flow of efficient heat transfer, thereby fundamentally significantly improve condensation phase-change heat transfer performance.Its course of work is, be near the condensate liquid of wall capillary structure section and under capillary effect, in time isolated condenser pipe by structures such as micropore or slits, and the liquid collecting cavity by the capillary structure assembly and catheter auto-pumping are to the end of condenser pipe, position by wall capillary structure section is set and area are with the too much timely diversion heat exchange of the condensate liquid wall in thick liquid film district or liquid bridge district, thereby the regulation and control flow pattern guarantees whole pipe range direction and is the annular flow heat transfer of thin liquid film, reaches the purpose that fundamentally improves condensing heat-exchange efficient.
Effect of the present invention is: (1) is by being provided with wall loose structure, liquid collecting cavity and catheter according to the flow pattern rule at common heat exchanger tube local location, the timely a large amount of condensate liquid of separating and condensing process, make the thick liquid film flow pattern in the condenser pipe change the annular flow that thin liquid film conducts heat into, thereby regulate and control flow pattern, enforcing condensation heat transfer with slug flow that contains the liquid bridge or slug flow; The present invention is from the basic physical process of condensation, solves the problem that worsens along pipe range direction condensation heat transfer from the angle of science, fundamentally broken through condensation heat transfer and formed the technical bottleneck that thick liquid film makes heat transfer deterioration along the pipe range direction; (2) utilizing the surface tension tapping of capillary structure and liquid among the present invention is the non-active process that need not to consume energy, its effect is not subjected to gravity effect, promptly be not subjected to the restriction at heat exchanger tube inclination angle, thereby, this structure is not only applicable to common condensation heat transfer and has the occasion of steam condensation, can also be extended to the condensation heat transfer under the microgravity condition.Make it under the situation that does not increase resistance, significantly improve the heat transfer efficiency of condensation phase-change heat-exchange pipeline.
Description of drawings
Fig. 1 is a capillary structure liquid division type condenser pipe overall structure schematic diagram;
Fig. 2 (a) is the capillary reinforced structure assembly axial section of wall pore type;
Fig. 2 (b) is the circumferential profile of capillary reinforced structure assembly of wall pore type;
Fig. 3 (a) is the capillary reinforced structure assembly axial section of wall silk screen type;
Fig. 3 (b) is the circumferential profile of capillary reinforced structure assembly of wall silk screen type;
Fig. 4 (a) is the capillary reinforced structure assembly axial section of porous foam type;
Fig. 4 (b) is the circumferential profile of capillary reinforced structure assembly of porous foam type;
Fig. 5 (a) is the capillary reinforced structure assembly axial section of wall slit-type;
Fig. 5 (b) is the circumferential profile of capillary reinforced structure assembly of wall slit-type;
Fig. 6 is semicircular condenser pipe example structure schematic diagram for the liquid collecting cavity cross section.
Among the figure, the common condensing heat-exchanging pipe of 1--, 2--wall capillary structure section, the 3--liquid collecting cavity, the 4--catheter, 5--condensation working medium flows to the side, 201--wall micropore, 202--circular hole, 203--woven wire, 204--porous foam ring, 205--wall slit.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing and instantiation.
Fig. 1 is a capillary structure liquid division type condenser pipe overall structure schematic diagram, capillary structure liquid division type condenser pipe is by common condensing heat-exchanging pipe 1, wall capillary structure section 2, liquid collecting cavity 3 and catheter 4 are formed, extremely terminal from the head end of condenser pipe, 2～5 wall capillary structure sections 2 are serially connected in the common condensing heat-exchanging pipe 1 at interval along the pipe range direction of common steam condenser pipe 1, liquid collecting cavity 3 surrounds wall capillary structure section 2 and is fixed on the common condensing heat-exchanging pipe 1, liquid collecting cavity 3 and wall capillary structure section 2 constitute capillary reinforced structure assembly, catheter 4 is interconnected the liquid collecting cavity 3 of each group capillary reinforced structure assembly, and catheter 4 extends to the terminal coupled of common condensing heat-exchanging pipe 1.Common condensing heat-exchanging pipe 1 is a light pipe, by realizing steam condensation in the pipe with the outer working medium heat exchange of pipe.The axial cross section of liquid collecting cavity 3 is a rectangle.Condensation working medium is pressed the condensation working medium shown in the figure and is flowed terminal from the head end flow direction of condenser pipe to side 5.
Wall capillary structure section 2, during by working medium condensation phase transformation in the flow pattern development law distribution of annular flow, semicircular stream, slug flow or slug flow and length thereof determine the position and the area of wall capillary structure section, the wall capillary structure section 2 of first group of capillary reinforced structure assembly is arranged on the thick liquid film place before the annular flow end in the pipe, since second group, the wall capillary structure section 2 of adjacent set capillary reinforced structure assembly is the length of slug flow or slug flow vapour bullet in axial distance, to eliminate or to weaken the liquid bridge thermal resistance of slug flow, the regulation and control flow pattern, augmentation of heat transfer; The liquid collecting amount that its circumferential distribution need be derived by the part is determined, because second group and after capillary reinforced structure assembly of each group need derive the liquid of whole liquid bridge, therefore second group and after respectively organize capillary reinforced structure assembly wall capillary structure section 2 capillary hole counts more than first group capillary hole count.
The pore diameter or the equivalent diameter of the wall capillary structure of wall capillary structure section 2 are calculated by following formula:
Wherein σ is that condensate liquid surface tension, g are acceleration of gravity, ρ
fBe condensate liquid density, ρ
gBe vapour phase density, i.e. condensation working medium surface tension is big, the slightly larger in diameter of pore, on the contrary smaller; For water, the diameter of pore is between 1～2mm, but the pore diameter analogy of corresponding different working medium and mixture.
To shown in Figure 5, in the capillary reinforced structure assembly, the wall capillary structure of wall capillary structure section 2 is wall pore type structure, wall slit-type structure, porous foam type structure or wall silk screen type structure as Fig. 2.
Fig. 2 (a) and Fig. 2 (b) are respectively the capillary reinforced structure assembly axial section and the circumferential profile of wall pore type, wall pore type structure is directly to beat wall micropore 201 on the tube wall of common condensing heat-exchanging pipe 1, from the axial section of Fig. 2 (a) as seen along on the pipe range direction, 5 groups of wall micropores 201 distribute in the liquid collecting cavity 3, and from visible every group of wall micropore 8 the wall micropores 201 that evenly distributed in a circumferential direction of the circumferential profile of Fig. 2 (b), condensed fluid can directly enter liquid collecting cavity 3 by wall micropore 201, thereby in time is separated to the condenser pipe end through catheter 4.The circumferential distribution density of wall micropore of each section after the circumferential distribution density of wall micropore of first section wall capillary structure section 2 reaches less than second section.
Fig. 3 (a) and Fig. 3 (b) are respectively the capillary reinforced structure assembly axial section and the circumferential profile of wall silk screen type, the wall silk screen type structure of wall capillary structure section 2 is made up of with the woven wires 203 that are coated on outside the circular hole 202 the bigger circular hole 202 of the packet size on the tube wall that is open at common condensing heat-exchanging pipe 1, shown in Fig. 3 (b), 8 circular holes 202 evenly distribute on circumferential, condensed fluid can directly enter liquid collecting cavity 3 by circular hole 202 and woven wire 203, thereby in time is separated to the condenser pipe end through catheter 4.The circumferential number of each section circular hole after the circumferential number of circular hole of first section wall capillary structure section 2 reaches less than second section.
Fig. 4 (a) and be respectively the capillary reinforced structure assembly axial section of porous foam type and circumferential profile for Fig. 4 (b), wall capillary structure section 2 is the porous foam ring 204 that the perforated foams of foam metal or foamed ceramics processes, and be serially connected in the common condensing heat-exchanging pipe 1 along the pipe range direction with support or welding method, the capillary pore size of porous foam ring 204 is selected the order number in foam hole according to the result of calculation of the pore diameter of the wall capillary structure of described wall capillary structure section 2 or equivalent diameter, condensed fluid can directly enter liquid collecting cavity 3 by porous foam ring 204, thereby in time is separated to the condenser pipe end through catheter 4.Each section porous foam ring length after the porous foam ring length of first section wall capillary structure section 2 reaches less than second section.
Fig. 5 (a) and be respectively the capillary reinforced structure assembly axial section of wall slit-type and circumferential profile for Fig. 5 (b), wall slit-type structure is directly to process evenly parallel wall slit 205 on the tube wall of common condensing heat-exchanging pipe 1, identical from the length of the visible wall slit 205 of Fig. 5 (a) axial section with the length of liquid collecting cavity 3, from the circumferential visible wall slit 205 of profile 12 the wall slits 205 that evenly distributed in a circumferential direction of Fig. 5 (b).Condensed fluid can directly enter liquid collecting cavity 3 by wall slit 205, thereby in time is separated to the condenser pipe end through catheter 4.The circumferential distribution density of wall slit of each section after the circumferential distribution density of wall slit of first section wall capillary structure section 2 reaches less than second section.
Embodiment
Fig. 6 is semicircular condenser pipe example structure schematic diagram for the liquid collecting cavity cross section.Present embodiment is that the wall capillary structure of wall capillary structure section 2 is a wall pore type structure, the axial cross section of liquid collecting cavity 3 is semicircular capillary structure liquid division type condenser pipe, whole capillary structure liquid division type condenser pipe to be along the 2 groups of capillary reinforced structure assemblies that distribute on the pipe range direction, and the catheter 4 back end that links to each other with the liquid collecting cavity 3 of two groups of capillary reinforced structure assemblies directly links to each other with the condenser pipe end.
The preparation process of present embodiment is: with long 2.5m's
The copper pipe of 12mm * 1mm is as common condensing heat-exchanging pipe 1; Make first group of capillary reinforced structure assembly, at the head end of distance condenser pipe, promptly the wall position of working medium inlet 50mm circumferentially evenly distributes and makes a call to 4
The wall micropore 201 of 2mm, the pipe outside utilizes
The semicircle copper pipe of 5mm * 1mm surrounds whole wall micropores 201 and makes liquid collecting cavity 3 with the heat exchanger tube welded seal; Make second group of capillary reinforced structure assembly, at the head end 120mm place of distance condenser pipe, axial distribution two circles, circle circumferentially evenly distribute and make a call to 8 apart from being 3mm
The wall micropore 201 of 2mm, the same utilization
The semicircle copper pipe of 9mm * 1mm becomes liquid collecting cavity 3 in pipe outside welding processing; At last with 2 liquid collecting cavity 3 usefulness
The catheter 4 of 2mm is communicated with, and at heat exchanger tube afterbody 240mm place, the end of catheter 4 is communicated with heat exchanger tube, and this section heat exchanger tube all becomes the trunk line of condensed fluid, thus the capillary structure liquid division type condenser pipe that acquisition has enforcing condensation phase phase transition function.
The present invention is applicable to any occasion that needs the steam condensation, can use by single tube, and multitube parallel uses, and perhaps condenser pipe is assembled into condenser and uses; Owing to adopt capillary structure, utilize surface tension to realize that the outer vapor-liquid separation of condenser pipe is not subjected to gravity effect, all can significantly improve condensation coefficient under ground and microgravity environment.The present invention is not only applicable to common condensation heat transfer and has the occasion of steam condensation, can also be extended to the condensation heat transfer under the microgravity condition.
The above; only for the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (11)
1. capillary structure liquid division type condenser pipe, it is characterized in that, capillary structure liquid division type condenser pipe is by common condensing heat-exchanging pipe (1), wall capillary structure section (2), liquid collecting cavity (3) and catheter (4) are formed, pipe range direction along common steam condenser pipe 1 is connected in series 2～5 wall capillary structure sections (2) at interval, liquid collecting cavity (3) surrounds wall capillary structure section (2) outside and is fixed on the common condensing heat-exchanging pipe (1), liquid collecting cavity (3) and wall capillary structure section (2) constitute capillary reinforced structure assembly, each liquid collecting cavity (3) of organizing capillary reinforced structure assembly links to each other with catheter (4), and the end of catheter (4) links to each other with condenser pipe is terminal.
2. a kind of capillary structure liquid division type condenser pipe according to claim 1 is characterized in that described common condensing heat-exchanging pipe (1) is light pipe, the finned tube with extended surface, groove pipe or bellows tube.
3. a kind of capillary structure liquid division type condenser pipe according to claim 1 is characterized in that the axial cross section of described liquid collecting cavity (3) is rectangle or semicircle.
4. a kind of capillary structure liquid division type condenser pipe according to claim 1, it is characterized in that, described wall capillary structure section (2), annular flow in the development law of flow pattern during by working medium condensation phase transformation, semicircular stream, the distribution of slug flow or slug flow and length thereof are determined the position and the area of wall capillary structure section, the wall capillary structure section (2) of first group of capillary reinforced structure assembly is arranged on the thick liquid film place before the annular flow end in the pipe, since second group, the wall capillary structure section (2) of adjacent set capillary reinforced structure assembly is the length of slug flow or slug flow vapour bullet in axial distance.
5. a kind of capillary structure liquid division type condenser pipe according to claim 1 is characterized in that, the pore diameter of the wall capillary structure of described wall capillary structure section (2) or equivalent diameter are calculated by following formula and determined:
Wherein σ is that condensate liquid surface tension, g are acceleration of gravity, ρ
fBe condensate liquid density, ρ
gBe vapour phase density, i.e. condensation working medium surface tension is big, the slightly larger in diameter of pore, on the contrary smaller.
6. a kind of capillary structure liquid division type condenser pipe according to claim 1 is characterized in that, the wall capillary structure of described wall capillary structure section (2) is wall pore type structure, wall slit-type structure, porous foam type structure or wall silk screen type structure.
7. according to claim 1 or 6 described a kind of capillary structure liquid division type condenser pipes, it is characterized in that the wall micropore (201) of the wall pore type structure of described wall capillary structure section (2) has the circular hole or the square hole in different apertures for evenly distributed or non-homogeneous arrangement.
8. according to claim 1 or 6 described a kind of capillary structure liquid division type condenser pipes, it is characterized in that the wall slit (205) of the wall slit-type structure of described wall capillary structure section (2) has the slit of identical or different slit width for parallel, staggered or cross modal distribute.
9. according to claim 1 or 6 described a kind of capillary structure liquid division type condenser pipes, it is characterized in that the porous foam type structure of described wall capillary structure section (2) is porous foam ring (204).
10. a kind of capillary structure liquid division type condenser pipe according to claim 9 is characterized in that the material of described porous foam ring (204) is foam metal or foamed ceramics.
11. according to claim 1 or 6 described a kind of capillary structure liquid division type condenser pipes, it is characterized in that the wall silk screen type structure of described wall capillary structure section (2) is by the circular hole on the tube wall that is open at common condensing heat-exchanging pipe (1) (202) and be coated on the outer woven wire (203) of circular hole and form.
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| CN114148553A (en) * | 2021-11-12 | 2022-03-08 | 中国运载火箭技术研究院 | Weightless-like fluid distribution form construction system and control system |
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| CN111306591A (en) * | 2020-03-13 | 2020-06-19 | 晏兵 | Energy-saving water curtain type range hood for smart home |
| CN114148553A (en) * | 2021-11-12 | 2022-03-08 | 中国运载火箭技术研究院 | Weightless-like fluid distribution form construction system and control system |
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