동굴 내면 형상을 갖는 평판형 히트파이프의 응축 액막 유동 해석

이진성; 김태규; 박태상; 김충식; 박찬훈

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자료유형: 학술대회자료

저자정보: 이진성 (삼성종합기술원) 김태규 (삼성종합기술원) 박태상 (삼성종합기술원) 김충식 (삼성종합기술원) 박찬훈 (삼성전자)

저널정보: 대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2001년도 열공학/유체공학 부문 공동 추계학술대회 논문집

발행연도: 2001.9

수록면: 144 - 150 (7page)

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An analytic approach has been employed to study condensate film thickness distribution inside cave-shaped wall of a flat plate heat pipe. The results indicate that the condensate film thickness largely depends on condensate mass flow rate and local velocity of condensate. The increasing rate of condensate film for circular region reveals about 50% higher value than that of vertical region. The physical properties of working fluid significantly effect on condensate film thickness, and the values of condensate film thickness for the case of FC-40 is 5 times higher than that of water. In comparison with condensation on a vertical wall, the average heat transfer coefficient in cave-shaped wall presented 10-15% lower values due to the fact that the average film thickness formed inside cave-shaped wall was more thicken than that of vertical wall with equivalent flow length. A correlation formula which is based on the condensate film analysis for cave-shaped wall to predict average heat transfer coefficient is presented. Also, the critical minimum working fluid fill charge ratio based on condensate film analysis have been predicted, and the minimum fill charge ratio for FC-40 and water reveals about Ψ<SUB>crit</SUB> = 3-7%, Ψ<SUB>crit</SUB> = 0.5-1.3%, respectively, in the range of heat flux of q" = 5-90㎾/㎡.

#Condensate Film #Cave-Shaped Wall #Flat Plate Heat Pipe #Fill Charge Ratio

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