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.
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.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1990年第6期676-682,共7页
CIESC Journal
基金
国家自然科学基金资助项目
