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자료유형
학술대회자료
저자정보
Ogah Friday Imhanmhenisi (Pukyong National University) Jong-Seok Shin (Pukyong National University) Jong-Soo Kim (Pukyong National University)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2013년도 열공학부문 춘계학술대회 논문집
발행연도
2013.5
수록면
52 - 56 (5page)

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This paper introduces the results of the effect of working fluid on thermal performance of Pulsating Heat Pipe (PHP) for medium temperature range. The serpentine type of PHP was fabricated with copper tube outside diameter (O.D. 12.7㎜) and inner diameter (I.D. 9.7㎜). The working fluid employed was Dowtherm J and R-141b. We examined the performance of PHP filled with Dowtherm J and R-141b mixture. Results indicate that with small percentage mixture of R-141b (0.5%<SUB>vol</SUB>, 1%<SUB>vol</SUB>, and 2%<SUB>vol</SUB>) with Dowtherm J, the PHP performance was stable in the case of 0.5%<SUB>vol</SUB> of R-141b mixed with Dowtherm J. However, Increase proportion of R-141b in the mixture also increases saturation vapor pressure which is not desirable for heat pipe operation. In the case of 2%<SUB>vol</SUB> of R-141b results shows high temperature fluctuation in PHP operation. It was observed at a temperature below 100℃, R-141b was boiling with increased nucleation site and the average temperature difference between the evaporator and condenser section was 47.5℃ in the case of PHP filled with Dowtherm J and R-141b (0.5%<SUB>vol</SUB>), and 89.4℃ for Dowtherm J only. In the case of 1%<SUB>vol</SUB> the temperature difference was 80℃. PHP operation was stable in the case of Dowtherm J and R-141b (0.5%<SUB>vol</SUB>). The results indicate that the properties of working fluids significantly affect the start up characteristics and thermal performance of PHP.

목차

Abstract
1. Introduction
2. Experimental Set Up
3. Results
4. Conclusion
References

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UCI(KEPA) : I410-ECN-0101-2014-500-003551591