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Volume 2, Issue 2 (3-2017)
Abstract
In this study, heat transfer coefficient and the bubble diameter during pool boiling of pure water, pure ethanol and water-ethanol solutions on a horizontal tube in an atmospheric pressure is examined. Experiments are accomplished for different mole fraction of ethanol in water and in heat flux of 5-103 .The results reveal that heat transfer coefficient increases by increasing heat flux for pure water and pure ethanol and the combination of these two liquids. The heat transfer coefficient in the solution except for ethanol molar concentration of 0.04 is less than those in single component substances at the same heat flux. Also the heat transfer coefficient for azeotrope molar concentration y an error about 6% is almost equal to ideal heat transfer coefficient. Finally, the results are analyzed by Genetic Algorithm and a new model is presented to calculate the heat transfer coefficient of the water-ethanol solution.
