文献类型：期刊文献

中文题名：引入接触角的滴状冷凝分形传热功当量模型

英文题名：Contact Angle Affected Fractal Model of Dropwise Condensation Heat Transfer

作者：齐宝金[1];张莉[1];徐宏[1];孙岩[1];阮艺平[1];朱登亮[1]

机构：[1]华东理工大学机械与动力工程学院化学工程联合国家重点实验室,上海200237

年份：2011

卷号：25

期号：5

起止页码：751

中文期刊名：高校化学工程学报

外文期刊名：Journal of Chemical Engineering of Chinese Universities

收录：CSTPCD;;EI(收录号：20114614524873);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金(51006037)资助;上海市科技启明星计划(11QA1401800)资助

语种：中文

中文关键词：滴状冷凝;分形;接触角;传热模型

外文关键词：dropwise condensation; fractal; contact angle; heat transfer model

摘要：以Rose模型为基础,引入接触角因素建立单个液滴传热模型,基于液滴在冷凝表面的分形分布特性,考虑接触角对分形维数的影响建立液滴分布函数,进而建立不同接触角表面通用传热模型。采用不同液滴分布模型分别计算求得通过冷凝生长的液滴的分布函数f(r)以及通过合并生长的液滴的分布函数F(r),并将总冷凝传热表示为上述两种方式生长液滴传热之和。模型计算结果表明,随着静态接触角增大,分形维数逐渐减小,液滴生长周期缩短,脱落直径变小,传热性能提高。模型可计算获得较大接触角范围内冷凝液滴的分布函数和传热量,且模型计算值与文献数据及实验测量值吻合较好。适当选取接触角范围,可将大部分文献数据包含在模型内,较为合理地解释了不同文献数据存在差异的原因。
Based on the Rose model and the fractal characteristics of drop size distribution on condensing surface, a fractal model for dropwise condensation heat transfer was developed. Compared with the well-established Rose model, the proposed new model of dropwise condensation heat transfer has the consideration of the effects of the droplet＇s contact angle, the fractal dimension of drop size and maximum and minimum drop radii on the dropwise condensation heat transfer. In the proposed model, the drop size distribution functions of both the direct condensing drops and the coalescence drops were deduced and calculated respectively, and the total heat flux of dropwise condensation on the entire condensing surface was calculated as the sum of the contributions from the condensations of above mentioned two kinds of drops. The simulation results indicate that the fractal dimension for drop size distribution and the departure diameter of droplets decrease with the increase of the contact angle, which results in the increase of the condensation heat transfer coefficient. The model proposed is applicable to predict the heat flux of the condensing drops with a wide range of contact angles, and the prediction results can agree well with the different experimental dropwise condensation heat transfer data from different references by selecting different droplet contact angles. The study can also reasonably explain the cause of the diversities of the dropwise condensation heat transfer data from different references.