摘要
辐射空调系统冷辐射板夏季运行极易发生结露现象,严重影响其工程应用,对冷辐射板表面结露时液滴生长过程的研究十分必要。基于传热学与分子动力学建立液滴生长模型,通过MATLAB迭代运算,得到液滴半径随时间的变化规律,分析冷辐射板材料特性、工作条件以及空气环境变化对液滴生长过程的影响。结果表明:液滴的曲率半径主要受环境温湿度、冷辐射板基底温度的影响,其次受表观接触角的影响;冷辐射板材料的导热系数范围在155-393 W/(m·K)、冷辐射板基底厚度小于2 mm、冷辐射板表面微结构高度在5 nm-50μm范围内时对液滴生长的影响均可以忽略。
When the radiation air conditioning system is running in summer,the cold radiation plate is prone to condensation,which can seriously affect its engineering application.It is necessary to study the process of droplet condensation on the surface of cold radiation plate.A droplet growth model based on heat transfer and molecular dynamics was established,and the influences of material characteristics,working conditions and air environment on the droplet growth process were analyzed by MATLAB.The results show that the droplet curvature radius is affected by the cold radiation plate base temperature,the air temperature and relative humidity.Surface contact angle has a slight effect on the droplet growth.When the thermal conductivity of cold radiation plate is in the range of 155 W/(m·K)to 393 W/(m·K),the thickness of cold radiation plate is less than 2 mm,and the micro-structural height is in the range of 5 nm to 50μm,its influences can be ignored.
作者
梁绮祯
丁云飞
冯永明
LIANG Qi-zhen;DING Yun-fei;FENG Yong-ming(School of Civil Engineering,Guangzhou 510006,Guangdong Province,China;Guangzhou Provincial Key Laboratory of Building Energy Efficiency and Application Technologies,Guangzhou University,Guangzhou 510006,Guangdong Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2021年第10期43-47,53,共6页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(51878187)。
关键词
冷辐射板
结露
液滴生长
传热
分子动力学
cold radiation plate
condensation
droplets growth
heat transfer
molecular dynamics
