Fundamental Studies on the Ice Condenser of Vacuum Cooler
1980 Volume 42 Issue 3 Pages 413-420
Details
1980 Volume 42 Issue 3 Pages 413-420
The melting phenomena of an ice sphere placed in the vacuum cooler (total pressure: 11-19 Torr, fraction of air in vapor-air mixture: 0.3-0.7) was theoretically and experimentally investigated by measuring the velocity of fusion and the vapor partial pressure of water when total pressure and electric power supply were varied.
The summary of results were shown below.
1) Condensation flux (flux of condensing water vapor) decreased with total presture (Fig. 4).
2) Condensation flux decreased with the fraction of air in vapor-air mixture (Fig. 4).
3) The linear relationship was established between logarithmic partial pressure ratio of vapor-air mixture and condensation flux (Fig. 5). Consequently, the melting phenomena of an ice sphere can be explained well by film theory within the limits of this experiment.
4) Within the limits of this experiment, the relationship between mass transfer coefficient, kx and total pressure, II, was correlated as follows (Fig. 6).
kx=22.6II-1.1
