水平上向き平面系での非定常ミスト冷却熱伝達特性に関する研究

抄録

The effects of cooling rate and thermal conductance of a heat transfer plate on the heat transfer coefficient of mist cooling are experimentally investigated in the high-temperature region. Experiments are conducted for horizontal upward facing surfaces made of silver, stainless steel and fused quartz. The experimental conditions of mist flow are as follows: the air velocity is V_a=20m/s, the temperature of the water droplet is T_l=21°C, and the volumetric-droplet-flow-rate is D=0.00043-0.00472m³/m²s. It is found that, in the case where the horizontal surfaces face upward, thermal conductance of the surface material does not significantly affect the heat transfer coefficient, but the cooling rate of the surface affects the heat transfer coefficient if the heat capacity of the surface decreases to less smaller than a critical value.