New dimensionless equation for mass transfer at acetone evaporation under forced convection

Poós, Tibor and Varju, Evelin (2024) New dimensionless equation for mass transfer at acetone evaporation under forced convection. INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 159 (A). No. 107961. ISSN 0735-1933

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Abstract

Equations of evaporation rate were collected from literature for different liquids. These relationships directly result in the evaporation rate or the Sherwood number. Experiments were made for vaporization of acetone from a heated vessel, at different air velocities and temperatures of air and liquid surface. The effect of the different setting parameters, and the different directions of the heat flow on the evaporation rate were studied. As expected, when the air velocity and the temperature of the liquid were higher, the evaporation was faster, but when the temperature of the air was higher, the evaporation rate was lower. Based on the measurement results, a new dimensionless equation was created to determine the evaporation rate of acetone. The new equation and the correlations from the literature were compared with the results determined from the measurement data. Two of the ten correlations did not prove to be applicable to the measurement results, three correlations showed serious deviations, while five correlations gave fairly good results. Among these five correlations, the new dimensionless equation proved to be the most accurate for determining the evaporation rate of acetone in the examined range.

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