飽和沸騰熱伝達における極小熱流束点条件の整理 : 第2報

抄録

In this report, the correlation technique of conditions at minimum heat flux point (ΔT_M, q_M) for saturated boiling proposed by the author in the previous report is compared with experimental data for the effects of surface-geometry and system-pressure. Experiments to measure ΔT_M and q_M on horizontal cylinders of 0.39.6 mm in diameter are conducted for nitrogen and water at atmospheric pressure. The experimental results show that ΔT_M is almost independent of surface-geometry and is in good agreement with the author's correlation. This is confirmed also by the experimental data reported by Hein et al. for a downward facing conical surface at high system-pressures. Minimum heat fluxes on various surface-geometries for nitrogen, water, freons and isopropanol are estimated using existing correlations of fully developed film boiling and the author's correlation of ΔT_M. They are compared with a number of experimental data and it is confirmed that the present correlation technique is available as a tool for estimating the effects of surface-geometry and system-pressure on minimum heat flux.