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化工学报  2015 

水平管内纯饱和蒸汽强制对流冷凝局部换热特性

DOI: 10.11949/j.issn.0438-1157.20140754, PP. 92-98

Keywords: 水平管,环状流-半环状流,波状流,纯蒸汽,局部冷凝换热

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Abstract:

通过对水平管内饱和纯蒸汽强制对流冷凝换热的实验研究,分析在管内两相流型为环状流-半环状与波状流时,质量含汽率、蒸汽入口流速和压力对蒸汽冷凝换热的影响,并得到了同时适用于这两种流型的计算局部冷凝传热系数的经验关联式。结果表明:局部冷凝传热系数在环状流-半环状流及波状流下均随质量含汽率和压力的降低而减小;在环状流-半环状流下,随蒸汽入口流速的升高而增大,在波状流下,随蒸汽入口流速的增大而减小;实验拟合所得到的换热经验关联式与实验结果符合良好,偏差在±20%以内。

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