有限の下向き水平面の膜沸騰熱伝達に及ぼす液体サブクール度の影響

概要

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The effect of liquid subcooling on the convective film boiling heat transfer from a finite-size horizontal downward-facing surface was investigated both theoretically and experimentally. The approximate solution with some simplified assumptions was obtained by solving the two-phase boundary layer equations including the energy equation for the liquid boundary layer. The average Nusselt number, Nu_co, derived from the solution may be expressed in a simple form with the parameters of Grashof number, density ratio, (density-viscosity) ratio, liquid Prandtl number, dimensionless degree of wall superheating and dimensionless degree of liquid subcooling. The theoretical results were compared in terms of a ratio of the average Nusselt number for the case of subcooled liquid to that for the case of the saturated liquid, Nu_<co>/Nu_<co, sat>, with the experimental data obtained by Nishio et al. under the steady-state condition and those obtained by the present authors using a quenching methed. For the case of subcooled liquids, a correlation equation of heat transfer was proposed to effectively correlate the experimental data obtained under both quenching and steady-state conditions within ±15 percent.
一般社団法人日本機械学会の論文
1998-12-25