Abstract
On heated horizontal tubes (18mm O.D.) having the porous surface, a falling film of R-11 (flow rate 0.008-0.091 kg/(m.s)) was evaporated at atmospheric pressure. The heat transfer coefficient of liquid film evaporation is higher than that of pool boiling when the wall superheat is small ; however, the enhancement ratio reduces on the surface structure where the pool boiling heat transfer coefficient is already high. The appearance of dry spots on the porous surface was observed only at a small flow rate close to the threshold value for complete dry-out. Another advantage brought by the porous surface is the virtual elimination of hysteresis phenomena.
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