肋片参数对辐射器散热性能的影响研究

采用蒙特卡罗法计算等截面圆管直肋式辐射器的肋片和外管壁相互间的辐射换热,数值模拟了第一类换热边界条件下散热器的散热过程。分析了辐射器的肋片数、肋片高度、肋片厚度及管壁温度对肋片散热性能的影响。结果发现,在肋片质量一定的条件下肋片数及肋片高度均存在一优值,在该值附近肋片的散热效率最高,且该值受管壁温度的影响,温度越高该值越小;在肋片外形不变的条件下,增加肋片的厚度来提高辐射器的散热性能并不是经济的途径;肋片的散热效率随管壁温度的升高而减小,壁温较高时安装肋片的必要性降低。

Impact of Fin Parameters on Heat Rejection Performance of the Radiator of Straight Fins-Tube

Radiation heat transfer between fins and tube wall of the radiator of straight fins-tube was calculated by Monte Carlo Method.The impact of quantity of fin,fin height,fin thickness and the temperature of tube wall on heat rejection performance of the radiator under the first boundary condition were analyzed by numerical simulation.The analysis shows that,under a certain fin mass,there is an optimum quantity of fin and fin height to get the highest heat rejection efficiency.Fixed the fin shape,adding the fin thickness is not an effective way to increase the efficiency.The heat rejection efficiency of the fin is decreased with the temperature of tube wall decreasing,and the necessity of fitting fin is reduced when the wall temperature is higher.