대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제29권2호
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  • Pages.239-246
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  • 2005
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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액체과냉도가 하부폐쇄 수직환상공간 내부의 풀비등 열전달에 미치는 영향

Effect of Liquid Subcooling on Pool Boiling Heat Transfer in Vertical Annuli with Closed Bottoms

  • 발행 : 2005.02.01
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초록

Effects of subcooling on pool boiling heat transfer in vertical annuli with closed bottoms have been investigated experimentally. For the test, a tube of 19.1mm diameter and the water at atmospheric pressure have been used. Three annular gaps of 7.05, 18.15, and 28.20 have been tested in the subcooled water and results of the annuli are compared with the data of a single unrestricted tube. The increase in pool subcooling results in much change in heat transfer coefficients. At highly subcooled regions, heat transfer coefficients for the annuli are much larger than those of a single tube. As the heat flux increases and subcooling decrease, a deterioration of heat transfer coefficients is observed at the annulus of 7.05mm gap. Single-phase natural convection and liquid agitation are the governing mechanisms for the single tube while liquid agitation and bubble coalescence are the major factors at the bottom closed annuli.

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참고문헌

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