进口段对流换热对高温换热设备管口区温度场的影响

应用数值分析方法研究了圆管进口段对流换热对高温换热设备管口区温度场和材料最高温度的影响。针对4个不同的对流换热系数计算式进行了数值模拟,结果表明:对管口的热保护而言,这种影响不可忽略;采用计入了进口段效应的平均对流换热系数进行管口热设计是合理和安全的。

THE EFFECT OF THE CONVECT1VE HEAT TRANSFER IN THE ENTRANCE REGION OF THE TUBE ON THE HEAT TRANSFER IN THE TRBE -MOUTH REGION OF THE HIGH TEMPERATURE HEAT EXCHANGE EQUIPMENT

The effect of the convective heat transfer in the entrance region of the tube on the temperature field and the maximum temperature of the tube material in the tube -mouth region of the high temperature heat exchange equipment is examined by numerical analysis. The computations on the basis of four different formulas for convection heat transfer coefficient are performed. The computed results indicate that the efect can not be ignored as for heat protection of the tube -mouth region and it is resapnable and secure that the mean convective heat transfer coefficient with taking account of the effect of the entrance region is used in the thermal design of the tube -mouth region.