Influence of the Velocity, Local Position, and Relative Humidity of Moist Air on the Convective Mass Transfer Coefficient in a Rectangular Tunnel — Theory and Experiments

Abstract

This paper explores the effect of the relative humidity (RH) of moist air as well as velocity on the convective mass transfer coefficients (CMTC) at different positions. Experiments determined the local mass transfer coefficients of three water samples mounted in line with the bottom wind tunnel surface. The experiments were carried out at a temperature of 20°C, relative humidities of 30, 50, and 70%, and velocities between 0.1 and 5m/s. The experimental data show that the convective mass transfer coefficient is a function of velocity, the RH of the air and the local position. The experimental results are compared to expressions for the convective mass coefficients from the literature.