Abstract
Critical heat flux and liquid film flow rate at exit end of the test tube are measured with Freon 113 upward flow in a uniformly heated tube. The exit film flow rate at the critical heat flux condition is near to zero in all cases of the exit qualities higher than 50%, however, the exit film flow rate tends to increase as the heat flux is increased and the exit quality decreases less than 50%. A correlation is proposed for the critical condition with high heat fluxes, suggesting that the liquid film separation from the heated surface by vapor generation takes an important part of the critical phenomenon.
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