连续液滴撞击热壁面传热特性的研究  

Research on heat transfer characteristics of continuous droplets impinging on heated surface

作　　者：董凡琦 苏新军[1] 商彤 DONG Fan-qi;SU Xin-jun;SHANG Tong

机构地区：[1]天津商业大学机械工程学院天津市制冷技术重点实验室,天津300134

出　　处：《节能》2023年第3期30-33,共4页Energy Conservation

基　　金：国家自然科学基金项目(项目编号:51706154)。

摘　　要：为了研究不同碰撞速度以及不同换热方式对连续液滴撞击热壁面传热特性的影响,以8滴去离子水和铜板为试验材料,设置了速度分别为0.63 m/s、0.77 m/s、0.89 m/s、0.99 m/s的8滴去离子水液滴在膜态蒸发(铜板温度60℃)和核态沸腾(铜板温度110℃)两种换热方式下的液滴撞击热铜板试验,探究铜板热流密度值的变化。结果表明:膜态蒸发换热方式下,液滴撞击热壁面速度越大,铜板的最大热流密度值越大,液滴与壁面之间的换热效果越好。核态沸腾换热方式下,以0.89 m/s的速度值为转折点,当连续液滴撞击热壁面速度小于0.89 m/s时,液滴撞击速度越大,铜板热流密度值越大;当连续液滴撞击热壁面速度大于0.89 m/s时,随着液滴撞击速度的增大,铜板的热流密度值减小。In order to study the effects of different impinging velocities and heat transfer modes on the heat transfer characteristics of continuous droplets impacting on the heated surface,eight drops of deionized water and copper plates were used as the experimental materials.Four velocities of 0.63 m/s,0.77 m/s,0.89 m/s,and 0.99 m/s were set up for impinging experiments under two heat transfer modes of film evaporation(the copper plate temperature is 60℃)and nucleate boiling(the copper plate temperature is 110℃).The heat flux field during continuous droplets impinging on the heated surface were studied.The results show that under the condition of film evaporation,with the increase of droplets impinging velocity,the temperature of droplets increases faster,so the heat transfer between droplets and copper plates is better.Under the condition of nucleate boiling,the crisis point is the velocity of 0.89 m/s.When the velocity of continuous droplets impinging on the heated surface is less than 0.89 m/s,the heat flux value of copper plate increases with the increase of velocity.When the velocity of continuous droplets impinging on the heated surface is larger than 0.89 m/s,the heat flux value of copper plate decreases with the increase of velocity.

关 键 词：连续液滴 撞击速度 换热方式 传热特性 

分 类 号：TK124[动力工程及工程热物理—工程热物理]