电流法测量空气换热系数

Measurement of Air Heat Transfer Coefficient by Electricity Current Method

介绍了电流法测量换热系数的基本原理,并采用该方法测量了奥氏体不锈钢(0Cr18Ni9Ti)、Q235钢平板和棒状试样在不同风速和不同风向下从高温(900℃)到室温(20℃)的风冷换热系数。结果表明,风速越大换热系数越大;垂直风向的换热系数大于水平风向的换热系数;试样形状不同,换热系数也不相同,随风速的增大, 不同形状下换热系数的差别逐渐减小。

Electricity current method for heat transfer coefficient measurement was introduced. Heat transfer coefficients of austenitic stainless steel （0Cr18Ni9Ti） and Q235 from 20℃ to 900℃ with shapes of plate and bar were measured under different wind cooling and different wind direction conditions. The results show that heat transfer coefficient is larger when wind speed is larger; heat transfer coefficient under vertical wind is larger than that under horizontal wind; the difference between heat transfer coefficient with different shapes decreases with wind speed increasing.