Mechanism of Heat Transfer in Dropwise Condensation(Ⅱ) Measurements of Drop-size Distribution, Drop Growth Rate and Drop Departure Diameter

宋永吉; 张东昌; 林纪方

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Mechanism of Heat Transfer in Dropwise Condensation(Ⅱ) Measurements of Drop-size Distribution, Drop Growth Rate and Drop Departure Diameter

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- Mechanism of Heat Transfer in Dropwise Condensation(Ⅱ) Measurements of Drop-size Distribution, Drop Growth Rate and Drop Departure Diameter
- CIESC Journal Issue 6, (1990)
- 作者机构：
  
  大连理工大学化学工程研究所,大连理工大学化学工程研究所,大连理工大学化学工程研究所 ,,辽宁,大连,辽宁,大连,辽宁,大连
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 December 1990，
  
  Published：25 December 1990
- 稿件说明：
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宋永吉, 张东昌, 林纪方. Mechanism of Heat Transfer in Dropwise Condensation(Ⅱ) Measurements of Drop-size Distribution, Drop Growth Rate and Drop Departure Diameter[J]. CIESC Journal, 1990, (6).
DOI：

宋永吉, 张东昌, 林纪方. Mechanism of Heat Transfer in Dropwise Condensation(Ⅱ) Measurements of Drop-size Distribution, Drop Growth Rate and Drop Departure Diameter[J]. CIESC Journal, 1990, (6). DOI：

摘要

采用高速摄影方法

实时记录水蒸气在铜基合金表面上的滴状冷凝情况

利用数字图象分析系统对所得图片进行分析

研究了不同条件下的液滴分布函数、液滴生长速率及液滴脱离直径.

Abstract

The processes of dropwise condensation of steam on various copper alloy surfaces were recorded by high speed photography.The obtained negatives were analyzed by digital image processing. The results of drop-size distributions

drop growth rates and drop departure diameters under different conditions were derived

and analyzed. The drop size distribution can be expressed as N(D) = AD-B. It was mainly affected by surface properties and was little affected by operation conditions. The growth rate of a small drop was controlled by steam condensing rate

and coalescence among drops was the dominant reason of big drop growth. The drop departure diameter was determined by condensation surface properties. Operation conditions has little influence on drop departure diameter but had obvious effect on drop growth rate.

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