POOL BOILING HEAT TRANSFER ENHANCEMENT OF WATER USING BRAZED COPPER MICROPOROUS COATINGS

被引:0
|
作者
Jun, Seongchul [1 ]
Wi, Hyoseong [1 ]
Gurung, Ajay [2 ]
Amaya, Miguel [2 ]
You, Seung M. [1 ]
机构
[1] Univ Texas Dallas, Dept Mech Engn, 800 W Campbell Rd, Richardson, TX 75083 USA
[2] Univ Texas Arlington, Mech & Aerosp Engn Dept, 500 W First St, Arlington, TX USA
来源
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2015, VOL 8A | 2016年
关键词
SURFACES;
D O I
暂无
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
A novel, high-temperature, thermally-conductive, microporous coating (HTCMC) is developed by brazing copper particles onto a copper surface. This coating is more durable than many previous microporous coatings and also effectively creates reentrant cavities by optimizing brazing conditions. A parametric study of coating thicknesses of 49 - 283 mu m with an average particle size of 25 mu m was conducted using the HTCMC coating to understand nucleate boiling heat transfer (NBHT) enhancement on porous surfaces. It was found that there are three porous coating regimes according to their thicknesses. The first regime is "microporous" in which both NBHT and critical heat flux (CHF) enhancements gradually grow as the coating thickness increases. The second regime is "microporous-to-porous transition" where NBHT is further enhanced at lower heat fluxes but decreases at higher heat fluxes for increasing thickness. CHF in this regime continues to increase as the coating thickness increases. The last regime is named as "porous", and both NBHT and CHF decrease as the coating thickness increases further than that of the other two regimes. The maximum nucleate boiling heat transfer coefficient observed was 350,000 W/m(2)K at 96 mu m thickness ("microporous" regime) and the maximum CHF observed was 2.1 MW/m(2) at 225 mu m thickness ("porous" regime).
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页数:9
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