CN1464024A - Process for preparing high thermal factor - Google Patents
Process for preparing high thermal factor Download PDFInfo
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- CN1464024A CN1464024A CN 02133334 CN02133334A CN1464024A CN 1464024 A CN1464024 A CN 1464024A CN 02133334 CN02133334 CN 02133334 CN 02133334 A CN02133334 A CN 02133334A CN 1464024 A CN1464024 A CN 1464024A
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Abstract
The present invention is one kind of nano diamond-water fluid. Diamond particle is first prepared in high speed airflow crusher or other efficient crushing apparatus and then selected via floating process to obtain diamond particle with size smaller than 500 nm, and through further acid pickling to eliminate impurity and drying, fine diamond powder is prepared. Ionic and/or non-ionic surfactant are mixed with water to compound water solution of surfactant in 0.01-0.5 % concentration. Under stirring and ultrasonic vibration, fine diamond powder is added into the water solution of surfactant to form diamond-water suspension. The diamond-water suspension has high heat conducting coefficient and may be used as heat exchanging or cooling medium.
Description
The invention belongs to field of material preparation, specifically is the method that the diamond particle that will have high thermal conductivity coefficient adds " diamond-water " series nano fluid of making high thermal conductivity coefficient in the water to, can be used as high efficient heat exchanging working medium and is used.
Along with becoming increasingly conspicuous of science and technology development and energy problem, more and more higher to the requirement of the performance index such as efficient low-resistance compactness of heat exchanging apparatus.Usually the measure of enhancement of heat transfer is mainly started with from enhanced heat exchange surface, manufacturing process, has obtained some achievements.But along with to the going deep into of heat exchanging apparatus heat exchange surface enhancement of heat transfer technical study, the heat transfer property of heat-exchange working medium becomes a principal element that influences heat exchanging apparatus high-efficiency compact performance.To develop further that volume is little, in light weight, the high-efficiency compact formula heat exchanging apparatus of good heat-transfer, satisfy high loading heat transfer requirement, the research high strength is conducted heat and cooling technology, must start with from working medium itself and develop the new high-efficiency heat-exchange working medium of high thermal conductivity coefficient, good heat-transfer.
Since Maxwell theory (1881) was delivered, many scholars had carried out studying with the theory and practice that improves its thermal conductivity about add solids in liquid in a large number, and have obtained some achievements.Because previous research all is confined to technical qualification at that time, can only use millimeter or micron-sized solids to be suspended in the liquid, easily cause ill effects such as wearing and tearing and particle plugging in actual applications, thereby limited its application in industry greatly.Since the last century the nineties, the researchist uses nano particle to add in the liquid to improve the thermal conductivity of liquid.Nineteen ninety-five, the people such as Choi of U.S. Argonne National Laboratory propose a new notion-nano-fluid, promptly add nano level metal or metal oxide particle with ratio in liquid in some way, form the new heat-conductive cooling working medium of a class.Compare with former neat liquid, the thermal conductivity of nano-fluid significantly improves, and has extremely superior heat transfer property.Improve 20% (Lee etc., 1999) as the copper oxide nanometer particle thermal conductivity that in ethylene glycol, adds 4% volume ratio; In water, add copper oxide nano particle, under identical flow state, can improve convection transfer rate more than 20% (Eastman etc., 1997 years) less than 1% volume ratio.Constitute efficient cooling system to solve the high loading heat dissipation problem of crystalline silicon eyeglass under the effect of high strength X ray with nano-fluid and micro heat exchanger.The cooling intensity of system can reach 30MW/M
2(Lee etc., 1996).Domestic nearest research also shows, adds the copper nano-particle of 2% volume fraction in deionized water, and the thermal conductivity ratio deionized water of formed nano-fluid improves 20%; Add the copper nano-particle of 1% volume fraction in water, the thermal conductivity of its nano-fluid improves 5%, and the convection transfer rate of the nano-fluid under flow state improves about 24% than pure water.By research to the nano-fluid enhanced heat transfer mechanism, can develop new and effective heat-transfer working medium, can effectively improve the heat transfer property of heat exchanging apparatus, improve the performances such as high-efficiency compact of heat exchanging apparatus greatly, reduce the manufacturing cost of heat exchanging apparatus, satisfy enhancement of heat transfer requirement under the microscale condition, the high loading that satisfies equipment such as high-power engine, superconducting magnet and supercomputer conducts heat and the cooling requirement.
The objective of the invention is in order to prepare " diamond-water " series nano fluid of high thermal conductivity coefficient, and used as novel high efficient heat exchanging working medium.
The objective of the invention is to realize: 1. prepare the diamond nano particulate by following technical proposals.
Adopt high velocity air pulverizer or other efficient disintegrating apparatus that the diamond particles of synthetic is further pulverized, adopt flotation process therefrom to select the diamond particle of particle diameter then less than 250 nanometers, and it is carried out pickling, to remove catalyzer and other impurity, with pure water diamond particle is cleaned dry for standby again.2. configuration contains the aqueous solution of tensio-active agent.
According to the diamond surface characteristic, can select ionic, non-ionic type and both compound tensio-active agents by a certain percentage for use, be configured to contain the aqueous solution of tensio-active agent.As select the anion surfactant of fluorine carbon type for use, its concentration of aqueous solution is 0.01-0.1%.3. under stirring and ultrasonic vibration condition, diadust is added in the aqueous solution that contains tensio-active agent, making " diamond-water " is suspension, and wherein adamantine volume content is 1-5%.
Adopting prepared " diamond-water " of the present invention is that suspension is measured through the 4th detection of Beijing's construction project quality control center, and its thermal conductivity is 0.981w.m
-1.k
-1, improve about 80% than the thermal conductivity of pure water, it as heat-exchange working medium, under quite wide Reynolds number condition, is all had very high heat exchange or cooling efficiency.
Claims (4)
1. " diamond-water " series nano fluid of high thermal conductivity coefficient, it is characterized in that selecting for use the diamond particle of high thermal conductivity coefficient under stirring or ultrasonic vibration condition, add to and contain ionic, non-ionic type or both by a certain percentage in the aqueous solution of compound tensio-active agent, forming " diamond-water " is suspension.
2. the preparation method of " diamond-water " series nano fluid of high thermal conductivity coefficient according to claim 1 is characterized in that selecting for use the diamond particle of high thermal conductivity coefficient, and the particle diameter of diamond particle should be less than 500 nanometers.
3. the preparation method of " diamond-water " series nano fluid of high thermal conductivity coefficient according to claim 1, it is characterized in that described tensio-active agent can select ionic, non-ionic type or both compound tensio-active agents by a certain percentage for use, surfactant concentrations is 0.01-0.5%.
4. according to the preparation method of " diamond-water " series nano fluids of claim 1,2,3 described high thermal conductivity coefficients, it is characterized in that except that selecting diamond particle for use, also can select the nanoparticle of other high thermal conductivity coefficient for use, as non-metal particles such as the aluminium nitride of high-crystallinity, carbon 60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133334 CN1464024A (en) | 2002-06-24 | 2002-06-24 | Process for preparing high thermal factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133334 CN1464024A (en) | 2002-06-24 | 2002-06-24 | Process for preparing high thermal factor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1464024A true CN1464024A (en) | 2003-12-31 |
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| CN 02133334 Pending CN1464024A (en) | 2002-06-24 | 2002-06-24 | Process for preparing high thermal factor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388645A (en) * | 2014-12-11 | 2015-03-04 | 山东大学 | Diamond liquid quenching medium as well as preparation method and application thereof |
| CN104449593A (en) * | 2014-12-11 | 2015-03-25 | 山东大学 | Diamond type cooling medium as well as preparation method and application thereof |
| CN105271173A (en) * | 2015-09-25 | 2016-01-27 | 郑州华晶金刚石股份有限公司 | Preparation process of nano carbon crystals |
| CN107365571A (en) * | 2017-06-09 | 2017-11-21 | 内蒙古工业大学 | The preparation technology and microchannel heat-transfer working medium of carbon pipe nano-fluid |
| CN109370540A (en) * | 2018-11-14 | 2019-02-22 | 深圳市爱能森储能技术创新有限公司 | Thermally conductive suspension and preparation method thereof |
| CN113811585A (en) * | 2019-05-28 | 2021-12-17 | 沃尔沃卡车集团 | Methods and systems for enhancing solid/liquid interface heat transfer via charge-induced manipulation of functionalized nanofluids |
| CN115449352A (en) * | 2022-09-20 | 2022-12-09 | 江阴市利伟轧辊印染机械有限公司 | Heat-conducting medium and hot roll |
-
2002
- 2002-06-24 CN CN 02133334 patent/CN1464024A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388645A (en) * | 2014-12-11 | 2015-03-04 | 山东大学 | Diamond liquid quenching medium as well as preparation method and application thereof |
| CN104449593A (en) * | 2014-12-11 | 2015-03-25 | 山东大学 | Diamond type cooling medium as well as preparation method and application thereof |
| CN104388645B (en) * | 2014-12-11 | 2017-01-18 | 山东大学 | Diamond liquid quenching medium as well as preparation method and application thereof |
| CN105271173A (en) * | 2015-09-25 | 2016-01-27 | 郑州华晶金刚石股份有限公司 | Preparation process of nano carbon crystals |
| CN105271173B (en) * | 2015-09-25 | 2017-12-12 | 郑州华晶金刚石股份有限公司 | A kind of preparation technology of nanometer carbon crystal |
| CN107365571A (en) * | 2017-06-09 | 2017-11-21 | 内蒙古工业大学 | The preparation technology and microchannel heat-transfer working medium of carbon pipe nano-fluid |
| CN107365571B (en) * | 2017-06-09 | 2020-05-26 | 内蒙古工业大学 | Preparation process of carbon tube nano fluid and microchannel heat transfer working medium |
| CN109370540A (en) * | 2018-11-14 | 2019-02-22 | 深圳市爱能森储能技术创新有限公司 | Thermally conductive suspension and preparation method thereof |
| CN113811585A (en) * | 2019-05-28 | 2021-12-17 | 沃尔沃卡车集团 | Methods and systems for enhancing solid/liquid interface heat transfer via charge-induced manipulation of functionalized nanofluids |
| CN115449352A (en) * | 2022-09-20 | 2022-12-09 | 江阴市利伟轧辊印染机械有限公司 | Heat-conducting medium and hot roll |
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