摘要
建立了燕尾形轴向槽道热管蒸发和冷凝薄液膜传热特性理论模型,并对模型进行了数值求解.对蒸发薄液膜区液膜厚度、接触面温度和热流密度分布进行了分析,给出了汽液接触面蒸发/冷凝传热系数沿轴向的变化.研究表明:在蒸发薄液膜区域,薄液膜厚度沿槽壁方向呈线性增加;汽液接触面的温度在起点几乎和壁面温度相同,随着薄液膜厚度的增加而迅速降低;在薄液膜的起始段,热流密度快速达到最大值,随即迅速减小.蒸发段的蒸发传热系数大于冷凝段的冷凝传热系数,蒸发/冷凝传热系数在整个绝热段并不都为零.同时,通过实验验证了模型的正确性.
A theoretical model with a focus on the thin liquid film of the evaporator and condenser section is developed to predict the evaporation and condefisation heat transfer characteristics of heat pipes with axially swallow-tailed microgrooves, which is then solved numerically. The thin film thick- ness, temperature of vapor-liquid interface and heat flux variations in the evaporating thin film region are analyzed. Meanwhile, the heat transfer coefficient of evaporation/condensation along the axial di- rection in the liquid-vapor interface is presented. The results indicate that the film thickness increases along the wall of microgroove in a linear fashion in the evaporating thin film region; the temperature of the vapor-liquid interface is equal to the wall temperature at the start point and decreases drastically with the increase of the film thickness; in the initial section of thin film, heat flux quickly gets to the maximum value and then rapidly decreases along the wall of microgroove. The evaporating heat trans- fer coefficient in the evaporator section is higher than the condensing heat transfer coefficient in the condenser section. In the adiabatic section, the heat transfer coefficient of evaporation/condensation is not all of zero. In addition, the accuracy of the numerical results is verified by the experimental data.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第3期453-456,共4页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金重大资助项目(11190015)
高等学校博士学科点专项科研基金资助项目(20110092110049)
关键词
槽道热管
传热
薄液膜
grooved heat pipe
heat transfer
thin liquid film
