Quasi-Steady Water Droplet Heat- and Mass-Transfer With Ventilation, Blowing, and Radiation

Abstract A quasi-explicit analytical model of quasi-steady (QS) water droplet heat- and mass-transfer, including radiation, in a prescribed gaseous environment with velocity slip, i.e., gas flow around the droplet, and high mass-transfer-rate blowing effects has been developed. The model is an extension of an atmospheric science model used for cloud and fog droplets in dilute and near-saturation conditions with negligible velocity slip (ventilation flow) and blowing. The new model includes the effects of ventilation flow, blowing, and change in relative humidity or supersaturation across the diffusion layer surrounding the droplet. Comparisons show significant improvement in accuracy over the conventional model, particularly for conditions of low relative humidity, low pressure, and high radiative flux.