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Experimental study on evaporative heat transfer in falling film outside horizontal tube

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Indexed by:Journal Papers

Date of Publication:2015-08-28

Journal:ACTA ENERGIAE SOLARIS SINICA

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:36

Issue:8

Page Number:1996-2001

ISSN No.:0254-0096

Key Words:海水淡化;水平管;多效蒸发;降膜蒸发;传热系数

Abstract:以水为工质,对直径为19 mm的铝黄铜管外降膜蒸发传热过程进行实验研究.实验通过测量管表面和饱和蒸气温度,计算得到平均和局部传热系数.由实验数据分析喷淋密度、蒸发温度、热流密度、管间距等参数对管外平均传热系数的影响,并与直径25.4 mm铝黄铜管降膜蒸发传热系数进行比较,讨论局部传热系数随周向角度的变化.结果表明,在实验范围内,管外平均传热系数随温度的升高而增大,随喷淋密度的增大先增大,后略微下降.小管径管的降膜蒸发传热系数大于大管径管的传热系数.

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