Minimum Heat Flux of Saturated Pool Boiling on a Horizontal Heated Surface : An Experiment for R113 at Reduced and Elevated Pressures

Abstract

Minimum heat flux as well as well as minimum film boiling temperature was measured for R113 under pressures from 0.05 to 0.90 MPa. The diameter of the heated surface was 62 mm, which is about five times larger than the most dangerous wavelength of R113. At the periphery of the heated surface, an auxiliary ring was set in order to prevent the collapse of the vapor film. Data obtained agree with Berenson's equation at atmospheric pressure, but at both low and high pressures they deviate markedly. Dimensional analysis shows that the liquid-vapor density ratio should be included in the correlation of Berenson. Present data can be correlated well in dimensionless form as a function of density ratio. It is also shown that the author's theory in a previous paper explains the result in a high pressure region fairly well.