蒸发薄液膜非等温界面处电场强化传热的数值分析  

Numerical analysis on electric field heat transfer enhancement at non-isothermal interface of evaporating thin film

作　　者：张怡 刘红敏[1] 

机构地区：[1]上海海事大学

出　　处：《制冷与空调》2013年第3期105-109,119,共6页Refrigeration and Air-Conditioning

摘　　要：电场能够强化微通道中延展弯月面处蒸发薄液膜区域非等温界面处的换热。分析在扩展的拉普拉斯方程及Wayner界面传质方程的蒸发毛细弯月面薄液膜区热质传输模型的基础上,加入电场力后电场强化蒸发薄液膜的换热效果。运用数值方法,讨论电场力对薄液膜固有弯月面处的曲率、蒸发质量流量、液相压力梯度、热流密度和传热系数的影响。数值计算结果表明,电场的存在可以显著提高微通道中薄液膜区域的换热系数,进而提高换热效率。Heat transfer at non-isothermal interface of evaporating thin film can be en hanced by electric field. A new mathematical model subjected to van der Waals attractive forces, the capillary pressure and the electric is developed to describe the heat transfer en- hancement in the evaporating thin liquid film. The effect of electrostatic field on the curvature of the thin film, evaporative flux, pressure gradient distribution, heat flux, and heat transfer coefficient in the thin film is presented. The results show that heat transfer in the thin liquid film can be enhanced significantly by the electric field. In addition, using electric field at the evaporating thin film will be a way to expand the extended meniscus region to attain high heat transfer coefficient and high rates of heat flux.

关 键 词：蒸发薄液膜 电场 强化换热 微通道 

分 类 号：TK124[动力工程及工程热物理—工程热物理]