衝突噴流沸騰系の限界熱流束の改善 : 高サブクール液による200MW/m^2級限界熱束への挑戦(熱工学,内燃機関,動力など)

概要

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Critical heat flux (CHF) has been measured on a small rectangular heated surface of L=5 and 10mm in length and W=4 and 6mm in width with an impinging jet of highly subcooled water to achieve an ultra high critical heat flux. The experiments were carried out at jet velocities of u = 5-60 m/s, system pressures of P=0.1-l MPa and degree of subcooling of ΔT_<sub> = 80-170 K. The effect of heater thickness appeared below 0.3mm and the CHF reduces with decrease in the thickness. Characteristics of the CHF for the longer heated surface L = 10mm agreed well with an existing correlation within ±20%. The maximum CHF of 212 MW/m^2 was recorded at P=0.5 MPa, u = 35 m/s and ΔT_<sub>=151 K. Then, the maximum CHF at atmospheric pressure can approach to 48% of the ultimate maximum heat flux q_<max,max> proposed by Gambill and Lienhard who evaluated it from the mean velocity of molecular dynamics.
一般社団法人日本機械学会の論文
2003-05-25