摘要
为了探究液滴撞击热壁面的动力学及汽化特性,设计与搭建了可视化实验系统,探究了液滴相态变化特性,并针对典型工况开展了数值模拟分析。研究发现壁面温度与液滴撞击速度是影响液滴形变及壁面传热的重要因素。撞击速度的增加促进液滴铺展,增加液滴与壁面的接触面积从而增强传热,同时液膜变薄也有利于热量传递;壁面温度的升高会加快液滴汽化,引发液滴相态的转变,呈现膜态蒸发、接触沸腾、破碎雾化、雾化弹跳、膜态飞溅和中心射流六种相态。
To investigate the dynamics and vaporization characteristics of droplet impact on a hot wall,a visualization experimental system was designed and built.The phase change characteristics of the droplet were studied,and numerical simulations were conducted for typical conditions.The investigations found that the wall temperature and droplet impact velocity are important factors affecting droplet deformation and wall heat transfer.An increase in impact velocity promotes droplet spreading,increases the contact area between the droplet and the wall,thereby enhancing heat transfer.At the same time,the thinning of the liquid film also facilitates heat transfer.An increase in wall temperature accelerates droplet vaporization,triggering the phase morphological evolution of the droplet,presenting six phase states:film evaporation,contact boiling,fragmentation and atomization,atomization bouncing,film splash,and central jet.
作者
王太
孙亦铁
李晟瑞
刘璐
闫润
王腾
董新宇
WANG Tai;SUN Yitie;LI Shengrui;LIU Lu;YAN Run;WANG Teng;DONG Xinyu(College of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei,China;Energy Storage and Novel Technology of Electrical Engineering Department,China Electric Power Research Institute Limited Company,Beijing 100192,China)
出处
《化工学报》
北大核心
2025年第11期5853-5864,F0004,共13页
CIESC Journal
基金
国家自然科学基金项目(52406183)
河北省自然科学基金项目(E2023502054,E2019502151)。
关键词
液滴
传质
汽化
传热
droplet
mass transfer
vaporization
heat transfer
