| Influence of Tube's Diameter on Boiling Heat TransferPerformance in Small Diameter Tubes |
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| 作者姓名： | Gan Chengjun Wang Weicheng Zhang Lining |
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| 作者单位： | Tsinghua University，Beijing，China |
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| 摘 要： | INTaoDUCTIONReclitlydry-troeeVaPoratorofairconditioningmaChineandreffigeratorhavebeendevefoPinginthedirectionofusingsmalldiamtertube.TheHITACHICo.conductedaserlesofeVaPoratfonhe8ttransferexperimeats,usingthethinwallcoppertubesofinnerdiamter9.52nun,8mm,7mmand5nunre-spectivelytheworkingmediawasHCFC22(qualityx=o.6)I'].TheresulthasshoWnthatheeVaPo-rationheattransfercoefficielltsweresghcatlyincreasedwiththedecreasingoftubediameter.EVaThorationheattransfercoefficientofa5.onuninnerdiare…
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Influence of Tube's Diameter on Boiling Heat Transfer Performance in Small Diameter Tubes |
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| Gan Chengjun,Wang Weicheng,Zhang Lining.Influence of Tube's Diameter on Boiling Heat TransferPerformance in Small Diameter Tubes[J].Journal of Thermal Science,1998(1). |
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| Authors: | Gan Chengjun Wang Weicheng Zhang Lining |
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| Abstract: | This paper reports the experiments of evaporation study in 6 mm inner copper diamter tubes us-ing HFC-134a, HCFC-22 and CFC-12 as working nuid. The results show that the evaporation heat transfer coefficient increases with the decreasing of inner diameter of tubes. A new concept of non-dimensional tube diameter U is proposed in this paper for correction of the influence of the tube diameter on the evaporation heat transfer coefficient. And further, a convnient empirical correction mehod is pented. |
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| Keywords: | evaporation heat transfer in-tube alternative refrigerants |
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