内翅板蒸发式冷凝器水膜流动特性-化工进展.pdf

化 工 进 展 2017 年第36 卷第6 期 CHEMICAL INDUSTRY AND ENGINEERING PROGRESS ·2017 · 内翅板蒸发式冷凝器水膜流动特性 吴学红，陆刘记，刘旭，龚毅 （郑州轻工业学院能源与动力工程学院，河南郑州450002 ） 摘要：为了提高蒸发式冷凝器板外换热性能以及增强板外气液两相流动，设计了 4 种新型内翅板蒸发式冷凝器 换热板片结构，实验测试不同喷淋密度下各换热板片上的水膜流动形态及喷淋密度对板片换热性能的影响。结 果表明：水膜厚度随喷淋密度减小而减薄；喷淋密度较大时，受板片结构及气液剪切力影响，水膜流动向中心 区域聚集，且部分区域会出现水膜飞溅现象；随着喷淋密度减小，水膜飞溅现象逐渐消失，但在低喷淋密度时 部分板片会有“干斑”现象。半圆波纹板片在喷淋密度分别为 0.524kg/(m·s)、0.738kg/(m·s)、0.905kg/(m·s)时， 换热性能均优于其他换热板片，且在此喷淋密度时，板片换热面积及水膜稳定时间是影响其换热性能的主要因 素。本实验研究为内翅板蒸发冷凝器的工程应用和设计提供理论指导。 关键词：气液两相流；蒸发；传热；水膜；喷淋密度 中图分类号：TB657.5 文献标志码：A 文章编号：1000 –6613 （2017 ）06 –2017 –06 DOI ：10.16085/j.issn.1000-6613.2017.06.007 Experimental study on the water film flowing characteristics of the internal fin-plate evaporative condenser WU Xuehong，LU Liuji ，LIU Xu ，GONG Yi （School of Energy and Power Engineering，Zhengzhou University of Light Industry ，Zhengzhou 450002 ，Henan ，China ） Abstract ：In order to improve heat transfer performance of the evaporative condenser plate and enhance the gas-liquid two-phase flow，four heat-exchange plates of internal fin-plate evaporative condenser were developed. The water film flowing form with different spray densities and the influence of spray density on heat transfer of heat-exchange plate were investigated. The results showed that the thickness of water film thinned with the decrease of the spray density. Affected by the plate type and gas fluid shear stress ，water film flowing gathered toward the center area ，and the splash of water film appeared in local area with larger spray density.