关键词: 液体喷雾, 液滴蒸发, 质量传递驱动力, 质量流率

Abstract: Abstract: Single droplet evaporation is one of the important physical processes in liquid spray. Various models were formulated in the literature to compute the mass flow rate of droplet evaporation. It is found that all these models can be written in a single formulation, with various models represented by the different expressions in the driving force HM, which can be classified into three kinds, namely, classical model, mass analogy model and drift-flux model. In this paper, we perform an analysis of the assumptions involved in the derivation of the three kinds of models, and find that the drift-flux model which takes into account the effects of Stefan flow and corrective mass transfer, should be the correct expression, while the classical model ignores Stefan flow effect and the mass analogy model ignores transient effect. Then a study of the influence of the mass driving force HM on the droplet evaporation is carried out, we conclude that both the classical model and the mass analogy model underestimate the effect of evaporation especially at a high evaporate rate.

Key words: liquid spray, droplet evaporation, mass transfer driving force, mass flow rate