Abstract

The aim of the present research is to analyse evaporation intensity induced by natural convection. Simultaneous heat and mass transfer is observed in the case of evaporation from open water tanks as well as during the evaporation of surface moisture when drying materials. Relationships to determine the evaporation rate at natural convection were collected within this work. The equations for evaporation rate from these studies are valid in different ranges of interpretation (different gas and liquid temperature, surface area) and under certain conditions, which reduces their usefulness. New measuring apparatus has been installed and equations for determination of evaporation rate were validated. As a result of the validation, the equations of Leven, Boelter et al. and Bower and Saylor proved to be the most precise (±5% deviation) and equations of Box showed ±10% deviation to our measurement results.

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