低環境圧下での水噴霧冷却の蒸発特性解析 〔熱工学, 内燃機関, 動力など〕

抄録

The relation between the maximum heat transfer coefficient and the saturation temperature of vapor for water flash evaporation under low pressure circumstances is theoretically analyzed. The spray condition is taken into consideration as well as the experimental result that the maximum heat flux is proportional to the super heat temperature. The optimum evaporation time is introduced by the analytical consideration to reflect the experimental result of the linearity of the super heat flux, and the unknown constant included in the optimum evaporation time is determined by the experiment. The analysis result is compared with the experimental data and shows a good agreement with them. The analysis also gives the information regarding the optimum spray condition among the spray flow rate, particle diameter and the intermittent spray time to achieve the maximum heat transfer coefficient under low pressure circumstances.