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从理论上分析了表面传热系数与气压的关系,实验测试了电加热器在低压与常压下的换热性能,得出以下结论:低压与常压下表面传热系数的比值与气压比值的0.2次幂成正比;电加热器在低压与常压下散热功率基本相等;表面温度随气压的降低而升高。
The relationship between surface heat transfer coefficient and air pressure is theoretically analyzed. The heat transfer performance of electric heater under low pressure and atmospheric pressure is experimentally tested. The following conclusions are obtained: the ratio of the surface heat transfer coefficient under low and normal pressure to the air pressure ratio Of 0.2 power is proportional to; electric heater in the low pressure and atmospheric cooling power is basically equal; surface temperature decreases with the pressure increases.