CN109059604A - A kind of unstable wave intensified condenser tube and production method based on close and distant water spacer - Google Patents
A kind of unstable wave intensified condenser tube and production method based on close and distant water spacer Download PDFInfo
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- CN109059604A CN109059604A CN201810621273.6A CN201810621273A CN109059604A CN 109059604 A CN109059604 A CN 109059604A CN 201810621273 A CN201810621273 A CN 201810621273A CN 109059604 A CN109059604 A CN 109059604A
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- close
- curved surface
- bellows
- trough
- water spacer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/04—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by preventing the formation of continuous films of condensate on heat-exchange surfaces, e.g. by promoting droplet formation
Abstract
The present invention provides a kind of unstable wave intensified condenser tube based on close and distant water spacer, including condenser pipe body, the bellows that the inner tube of the condenser pipe body is smooth pipe, outer tube is sine wave shape, curved surface where the wave crest of the bellows is hydrophilic area, and curved surface where the trough of the bellows is hydrophobic region.In addition, the present invention also provides a kind of method for making above-mentioned condenser pipe, this method hydrophobic modification technology easy making process is applicable to stainless steel, copper, aluminium, quartz, glass and various material surface.
Description
Technical field
The present invention relates to a kind of equipment for enhancing condensation heat transfer, and in particular to one kind is based on pula support-Rayleigh unstability
Selectivity transformation is carried out to condenser pipe surface topography and hydrophobe row with hydrophobically modified technology to enhance the technology of condensation heat transfer.
Background technique
Under the action of gas-liquid interface unstability, the liquid film on round tube surface is locally gathered, and forms drop, which is claimed
For pula support-Rayleigh unstability, this be one kind as caused by surface tension, round tube surface thin liquid film form can be had an impact
Unstable effect.The critical instability wavelength of pula support-Rayleigh is only directlyed proportional to the sum of round tube diameter and initial thickness of liquid film.By
In the influence of the random perturbation from environment, condensation surface always will form unstable wave.Pula support-Rayleigh unstability causes
Liquid film locally gather can make condense pipe surface occur thin and thick it is different liquid film distribution, part of region because liquid film be thinned due to band
Carry out the enhancing of condensation heat transfer, principle is similar with ribbed pipe enhanced heat exchange.
Hydrophobic or super hydrophobic surface is a kind of and water mutual exclusion surface nature.Because of the effect of surface tension, water is hydrophobic
Tend to form drop on surface, rather than spreads and dissipate and infiltrate surface.Vapor condenses to form drop in hydrophobic surface, referred to as pearl
Shape condensation, and condense to form liquid film in water-wetted surface, referred to as film condensation.On the surface of close and distant water spacer, coagulating liq
Tend to flow from hydrophobic region to hydrophilic region.
Existing literature research instable to pula support-Rayleigh is concentrated mainly on the relevant mass transfer of the liquid film regularity of distribution and grinds
On studying carefully, rarely has the research that condensation heat transfer influential effect is carried out on the basis of uneven, unstable liquid film form, also without to condensation
Surface carries out structure and chemical modification, is allowed to match simultaneously the further application of enhanced heat transfer effect with instability wavelength.
The scheme for strengthening tube bank heat exchange currently with the effect of surface tension is mainly ribbed pipe (also known as screwed pipe).The technology
By significantly strengthening and changing in fin partial shape thin liquid film by pipe external fin, effectively increase heat exchange area, and conducive to surface tension
Heat.Since middle period the 1940s, 2D ribbed pipe is promoted rapidly in refrigeration industry, and since the seventies, ribbed pipe technology is obtained into one
Step development, 3D ribbed pipe is promoted and applied, while 2D ribbed pipe surface texture optimizes to have obtained significant progress.
But above-mentioned ribbed pipe has the following deficiencies:
1, the existing technological means for strengthening tube bank condensed exterior is mainly ribbed pipe, has obtained in industrial circle and has answered extensively
With.But ribbed pipe because caused by intensive rib structure tube bottom lime set be detained, form flooding area, cause Local Heat Transfer less able, have
Heat exchange area is imitated to reduce.Simultaneously ribbed pipe because surface texture it is tiny, intensive complicated, process is more complex, higher cost.
2, current research is only dedicated to understanding that pula support-Rayleigh unstability grows liquid film, migration, falls, is broken
The influence of process there is no the technology being modified to condensation tube bank surface using this unstability to Augmentation of condensation heat transfer ability
Scheme, also without the technical solution for maintaining thin liquid film area enhanced heat transfer effect further combined with hydrophilic and hydrophobic.
Summary of the invention
The present invention provides a kind of based on close and distant water spacer to solve drawbacks described above and deficiency existing in the prior art
Unstable wave intensified condenser tube and production method, the condenser pipe have close and distant water spacer curved surface.
In order to solve the above technical problems, the present invention provides a kind of unstable wave intensified condenser tube based on close and distant water spacer,
Including condenser pipe body, the bellows that the inner tube of the condenser pipe body is smooth pipe, outer tube is sine wave shape, the wave
Curved surface where the wave crest of line pipe is hydrophilic area, and curved surface where the trough of the bellows is hydrophobic region.
Further, the hydrophobic region is to first pass through to carry out chemical modification to curved surface where trough, is then connect again using chemistry
Branch method carries out hydrophobic grouping with modified curved surface to react acquisition.
Further, chemical modification modifies curved surface where trough using functionalized silane.
Further, functionalized silane is vinyltriethoxysilane.
Further, the hydrophobic grouping is dimethyl silicone polymer.
The present invention also provides the production methods of the above-mentioned unstable wave intensified condenser tube based on close and distant water spacer, including with
Lower step:
Step 1 calculates the instable critical instability wavelength of pula support-Rayleigh according to round tube size and thickness of liquid film
λ*:Wherein, r is round tube radius, h0For average thickness of liquid film；
Step 2, the side that cooperation corrugated mold is formed using inflation or directly smooth pipe is machined
Method, production outer tube are the condenser pipe of sine wave shape bellows, and wherein the wavelength of sine wave is λ*；
Step 3, it is then hydrophobically modified to curved surface progress where trough by curved face shielding where bellows wave crest, it obtains
The bellows of close and distant water spacer.
Further, carry out that hydrophobically modified specific step is as follows to curved surface where trough:
Step 3.1, chemical modification is carried out using surface of the functionalized silane to curved surface where trough；
Step 3.2, hydrophobic grouping is reacted using chemical graft process with modified surface, obtains the table in water transport property
Face.
Further, functionalized silane is vinyltriethoxysilane.
Further, the hydrophobic grouping is dimethyl silicone polymer.
Present invention advantageous effects achieved: a kind of unstable wave based on close and distant water spacer provided by the invention is strong
Change condenser pipe, pipe thickness is in periodic relief according to pula support-critical instability wavelength of Rayleigh, makes to adhere to outside pipe liquid film not
Locally gather at wave crest under stability action, form drop, causes liquid film at trough to be thinned, enhanced heat transfer effect；At trough
The condensation process in the hydrophobically modified region be dropwise condensation, exchange capability of heat is better than film condensation.And due to round tube moistened surface
Property is spaced apart in hydrophobe, tends to leave hydrophobic region after droplets agglomerate, it is ensured that it is less that the region is in drop always
State keeps higher condensation heat transfer coefficient.In addition, production method provided by the invention, hydrophobic modification technology easy making process, can fit
For stainless steel, copper, aluminium, quartz, glass and various material surface.
Detailed description of the invention
The condenser tube structure schematic diagram of Fig. 1 present invention；
The outer condensation process schematic diagram of the pipe of the condenser pipe of Fig. 2 present invention；
Fig. 3 present invention's carries out hydrophobically modified flow diagram to curved surface where trough.
Wherein: 1 inner tube；2 outer tubes；3 hydrophilic areas；4 hydrophobic regions；5 coagulating liqs.
Specific embodiment
The invention will be further described combined with specific embodiments below.Following embodiment is only used for clearly illustrating
Technical solution of the present invention, and not intended to limit the protection scope of the present invention.
The invention patent is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, the present invention provides a kind of unstable wave intensified condenser tube based on close and distant water spacer, including condenser pipe
Ontology, the inner tube 1 of the condenser pipe body are smooth pipe, the bellows that outer tube 2 is sine wave shape, the wave of the bellows
Curved surface where peak is hydrophilic area 3, and curved surface where the trough of the bellows is hydrophobic region 4.
The hydrophobic region is to first pass through to carry out chemical modification to curved surface where trough, then will be dredged using chemical graft process again
Water base group carries out reacting acquisition with modified curved surface；Wherein, chemical modification using functionalized silane to curved surface where trough into
Row modification, functionalized silane is vinyltriethoxysilane；The hydrophobic grouping is dimethyl silicone polymer.
The bellows of the close and distant water spacer of the present invention is installed among condensation heat transfer device, interior logical cooling water is managed.Vapor
It will be coagulated in tube outer surface, heat is released to condensation pipe surface in a manner of the latent heat of condensation, and finally by cooling in pipe
Water is taken away, and vapor condensation process outside pipe is as shown in Figure 2.In same chilled(cooling) water supply (CWS) amount, comparison is conventional smooth cold
Solidifying pipe, such as copper, stainless steel, can take away more heats using the unstable wave intensified condenser tube of close and distant water spacer
The present invention also provides the production methods of the above-mentioned unstable wave intensified condenser tube based on close and distant water spacer, including with
Lower step:
Step 1 calculates the instable critical instability wavelength of pula support-Rayleigh according to round tube size and thickness of liquid film
λ*:Wherein, r is round tube radius, h0For average thickness of liquid film；
Step 2, the side that cooperation corrugated mold is formed using inflation or directly smooth pipe is machined
Method, production outer tube are the condenser pipe of sine wave shape bellows, and wherein the wavelength of sine wave is λ*；
Step 3, it is then hydrophobically modified to curved surface progress where trough by curved face shielding where bellows wave crest, it obtains
The bellows of close and distant water spacer, specific steps are as shown in Figure 3, wherein base is curved surface where trough:
Step 3.1, chemical modification is carried out using surface of the functionalized silane to curved surface where trough, wherein function SiClx
Alkane is vinyltriethoxysilane.
Step 3.2, hydrophobic grouping is reacted using chemical graft process with modified surface, obtains the table in water transport property
Face, wherein the hydrophobic grouping is dimethyl silicone polymer.
The present invention is disclosed with preferred embodiment above, so it is not intended to limiting the invention, all to take equivalent replacement
Or the scheme technical solution obtained of equivalent transformation, it falls within the scope of protection of the present invention.
Claims (9)
1. a kind of unstable wave intensified condenser tube based on close and distant water spacer, it is characterised in that: described cold including condenser pipe body
The inner tube of solidifying tube body is smooth pipe, the bellows that outer tube is sine wave shape, and curved surface where the wave crest of the bellows is
Hydrophilic area, curved surface where the trough of the bellows are hydrophobic region.
2. the unstable wave intensified condenser tube according to claim 1 based on close and distant water spacer, it is characterised in that: described to dredge
Pool is to first pass through to carry out chemical modification to curved surface where trough, then again using chemical graft process by hydrophobic grouping with it is modified
Curved surface carry out reaction acquisition.
3. the unstable wave intensified condenser tube according to claim 2 based on close and distant water spacer, it is characterised in that: chemistry changes
Property curved surface where trough is modified using functionalized silane.
4. the unstable wave intensified condenser tube according to claim 3 based on close and distant water spacer, it is characterised in that: functionalization
Silane is vinyltriethoxysilane.
5. the unstable wave intensified condenser tube according to claim 2 based on close and distant water spacer, it is characterised in that: described to dredge
Water base group is dimethyl silicone polymer.
6. the production method of the unstable wave intensified condenser tube according to claim 1 based on close and distant water spacer, feature
Be the following steps are included:
Step 1 calculates the instable critical instability wavelength λ of pula support-Rayleigh according to round tube size and thickness of liquid film*:Wherein, r is round tube radius, h0For average thickness of liquid film；
Step 2, the method that cooperation corrugated mold is formed using inflation or directly smooth pipe is machined, system
Make the condenser pipe that outer tube is sine wave shape bellows, wherein the wavelength of sine wave is λ*；
Step 3, it is then hydrophobically modified to curved surface progress where trough by curved face shielding where bellows wave crest, it obtains close and distant
The bellows of water spacer.
7. production method according to claim 6, it is characterised in that: carry out hydrophobically modified tool to curved surface where trough
Steps are as follows for body:
Step 3.1, chemical modification is carried out using surface of the functionalized silane to curved surface where trough；
Step 3.2, hydrophobic grouping is reacted using chemical graft process with modified surface, obtains the surface in water transport property.
8. production method according to claim 7, it is characterised in that: functionalized silane is vinyltriethoxysilane.
9. production method according to claim 7, it is characterised in that: the hydrophobic grouping is dimethyl silicone polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810621273.6A CN109059604B (en) | 2018-06-15 | 2018-06-15 | Unstable wave reinforced condensation pipe based on hydrophilic and hydrophobic intervals and manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810621273.6A CN109059604B (en) | 2018-06-15 | 2018-06-15 | Unstable wave reinforced condensation pipe based on hydrophilic and hydrophobic intervals and manufacturing method |
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| CN109059604A true CN109059604A (en) | 2018-12-21 |
| CN109059604B CN109059604B (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810621273.6A Active CN109059604B (en) | 2018-06-15 | 2018-06-15 | Unstable wave reinforced condensation pipe based on hydrophilic and hydrophobic intervals and manufacturing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170235A (en) * | 2019-06-14 | 2019-08-27 | 华中农业大学 | The double film heat exchangers of hydrophobe strengthen the CO of waste heat recycling2Chemical absorbing System and method for |
| CN111238277A (en) * | 2020-01-09 | 2020-06-05 | 广东工业大学 | Flat heat pipe with composite liquid absorption core structure |
| CN111534871A (en) * | 2020-04-08 | 2020-08-14 | 北京航空航天大学 | Structural fiber for overcoming Rayleigh unstable behavior of fluid and application |
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| CN102538542A (en) * | 2011-12-30 | 2012-07-04 | 西安交通大学 | Flue gas condensation-type heat transfer pipe with bionic structure |
| WO2017163127A1 (en) * | 2016-03-24 | 2017-09-28 | The Hong Kong University Of Science And Technology | Enhanced condensed water capture by alternate arrangement of heterogeneous wetting surfaces |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110170235A (en) * | 2019-06-14 | 2019-08-27 | 华中农业大学 | The double film heat exchangers of hydrophobe strengthen the CO of waste heat recycling2Chemical absorbing System and method for |
| CN111238277A (en) * | 2020-01-09 | 2020-06-05 | 广东工业大学 | Flat heat pipe with composite liquid absorption core structure |
| CN111534871A (en) * | 2020-04-08 | 2020-08-14 | 北京航空航天大学 | Structural fiber for overcoming Rayleigh unstable behavior of fluid and application |
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| Publication number | Publication date |
|---|---|
| CN109059604B (en) | 2020-06-16 |
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