摘要
为研究冷壁表面特性和空气温度对液滴冻结过程的影响,以及液滴冻结过程中液滴内部温度随时间的变化规律,通过Ansys Fluent软件的凝固/熔化模型对冷壁表面上的液滴冻结过程进行数值模拟。结果表明:冷壁表面上的液滴在冻结过程中,内部温度分布不均匀,会随位置高度变化而变化。同时冷壁表面与液滴接触角越小,液滴内部温度散热越快,冻结时间也就越短。当接触角由60°增加到160°时,液滴冻结时间由24.7 s增加到337 s。空气温度越低,液滴发生相变的驱动力增加,液滴完全冻结时间越短,当空气温度由283.15 K降到263.15 K时,冻结时间由62.3 s降到55.7 s。
In order to study the influence of the cold wall surface characteristics and air temperature on the droplet freezing process,and the variation of the droplet internal temperature with time during the droplet freezing process,the freezing process of droplets on the surface of the cold wall was simulated by using the solidification/melting model of the Ansys Fluent software.The results show that the temperature distribution of the droplets on the surface of the cold wall was uneven during the freezing process,which will change with the location and height.At the same time,the smaller the contact angle between the cold wall surface and the droplet,the faster the internal temperature dissipation of the droplet,and the shorter the freezing time.When the contact angle increases from 60°to 160°,the freezing time of droplets increases from 24.7 s to 337 s.The lower the air temperature is,the greater the driving force for the phase change of the droplet is,and the shorter the complete freezing time of the droplet is.When the air temperature drops from 283.15 K to 263.15 K,the freezing time drops from 62.3 s to 55.7 s.
作者
王洪利
赵乾辉
梁精龙
张振迎
WANG Hongli;ZHAO Qianhui;LIANG Jinglong;ZHANG Zhenying(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei Province,China;College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan 063210,Hebei Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2023年第11期67-72,共6页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(51774143)
河北省自然科学基金资助项目(E2020209121)
唐山市科技创新团队培养计划资助项目(21130207D)。
关键词
冷壁表面
液滴冻结
固相体积分数
接触角
数值模拟
cold wall surfaces
droplet freezing
solid volume fraction
contact angle
numerical simulation
