平面噴流沸騰系の限界熱流束 : サブクールの影響について  [in Japanese] Critical Heat Flux in Forced Convective Boiling with a Plane Jet : Effect of Subcooling on CHF  [in Japanese]

Critical heat flux (CHF) has been measured on rectangular heated surfaces 40,60 and 80 mm in length and 10 and 20 mm in width during forced convective boiling with a plane jet. The experiments were carried out at jet velocities of 3 to 15 m/s, subcooling temperatures of 0 to 60 K, and system pressures of 0.1 to 3.1 MPa, depending on the test liquid, i. e., water and R22. The experimental results show that most of the existing correlations can be applied to the CHF of saturated water, but is barely applicable to the CHF of saturated R22. After the effects of jet velocity and subcooling on the CHF are elucidated, a new correlation including the effect of subcooling for prediction of most of the CHF data within an accuracy of ±20 percent is proposed. This correlation for saturation conditions is found to agree with that theoretically derived by application of the Katto and Haramura criterion to this system.