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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제48권 제4호
발행연도
2016.1
수록면
932 - 940 (9page)

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Pool boiling heat transfer of water saturated at atmospheric pressure was investigatedexperimentally on Cu surfaces with high-temperature, thermally-conductive, microporouscoatings (HTCMC). The coatings were created by sintering Cu powders on Cu surfaces in anitrogen gas environment. A parametric study of the effects of particle size and coatingthickness was conducted using three average particle sizes (APSs) of 10 mm, 25 mm, and67 mm and various coating thicknesses. It was found that nucleate boiling heat transfer(NBHT) and critical heat flux (CHF) were enhanced significantly for sintered microporouscoatings. This is believed to have resulted from the random porous structures that appearto include reentrant type cavities. The maximum NBHT coefficient was measured to beapproximately 400 kW/m2k with APS 67 mm and 296 mm coating thicknesses. This value isapproximately eight times higher than that of a plain Cu surface. The maximum CHFobserved was 2.1 MW/m2 at APS 67 mm and 428 mm coating thicknesses, which isapproximately double the CHF of a plain Cu surface. The enhancement of NBHT and CHFappeared to increase as the particle size increased in the tested range. However, two largerparticle sizes (25 mm and 67 mm) showed a similar level of enhancement.

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