摘要
采用数值模拟的方法,研究了沸腾雾化喷射过程中热壁面薄液膜层受到液滴碰撞扰动时液膜层内汽泡运动、相界面变化和由此引起的壁面换热特性。模拟结果显示汽泡生长初期相界面变化与液膜层内二次核化特征与文献结果吻合良好,汽泡生长后期相界面变化存在滞后。讨论了液滴下降速度、液滴直径与初始位置、多液滴碰撞对液膜层内流动与壁面换热的影响。
A mathematical model is developed to investigate the details of two-phase flow and heat transfer when a liquid droplet impacts a thin liquid film with vapor bubble growing during the nucleate spray,including the dynamics of bubble growth,the movement of the interface between two fluids and the surface heat transfer characteristics.It is found that the movement of the vapor-liquid interface and the fact that some new bubbles occur inside the film at the beginning of the bubble growth are in agreement with the results of the literature.The influences of droplet falling velocity, droplet diameter,initial position and the multi-droplets impact on the flow and heat transfer are discussed in the present study.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2011年第5期807-810,共4页
Journal of Engineering Thermophysics
基金
国家自然科学青年基金资助项目(No.50906083)
关键词
汽泡运动
壁面换热
数值模拟
vapor bubble growth
surface heat transfer
numerical simulation
