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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Vapor free convection film condensation heat transfer in the presence of non-condensable gases with smaller molecular weights than the vapor
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Vapor free convection film condensation heat transfer in the presence of non-condensable gases with smaller molecular weights than the vapor

机译：蒸汽自由对流膜冷凝热传递在不可凝聚的气体存在下，分子量小于蒸气

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Non-condensable gases seriously reduce the free convection film condensation heat transfer on surfaces with greater reductions when the gas molecular weight is smaller than that of the vapor (M-NG M-v) than when M-NG M-v. Thus, existing approximate heat transfer models for M-NG M-v cannot accurately predict the heat transfer for M-NG M-v. In this study, R11 free convection film condensation heat transfer on a horizontal tube outside surface was experimentally investigated in the presence of three non-condensable gases, N-2, CO2 and R22, whose molecular weights are all smaller than that of R11. The results show that the heat transfer is sharply reduced at very low gas concentrations with smaller reductions at increasing gas concentrations. The condensation heat transfer reduction due to the gases with M-NG M-v is much stronger than that with M-NG M-v at low gas concentrations. The reductions for the two types of gases get closer with increasing gas concentrations. A heat transfer correlation was developed with 95% of the predictions within 20% of the experimental data. (C) 2017 Elsevier Ltd. All rights reserved.
机译：当气体分子量小于蒸汽（M-Ng＆Lt; M-V）时，不可凝聚的气体在表面上重新降低的自由对流膜冷凝传热比蒸汽（M-Ng＆ M-V）的蒸汽（m-ng）; m-v。因此，M-NG＆GT的现有近似传热模型; M-V不能准确地预测M-NG＆LT; m-v。在该研究中，在三种不可冷凝气体，N-2，CO 2和R22的存在下实验研究了水平管外表面的R11自由对流膜冷凝传热，其分子量均小于R11的含量。结果表明，在气体浓度上较小的较低的气体浓度下，热传递在非常低的气体浓度下急剧下降。由于具有M-NG＆LT的气体引起的冷凝传热降低。 M-V比M-NG＆GT更强大;低气体浓度的M-V。两种类型的气体减少越来越接近气体浓度。在实验数据的20％以内，开发了传热相关性，其中95％的预测。 （c）2017 Elsevier Ltd.保留所有权利。

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