Direct numerical simulation of taylor bubble with phase change

Abstract

Direct numerical simulation of evaporating Taylor bubble flow in a vertical cylindrical microchannel is performed. The numerical method for multiphase flow is based on the level set methods with sharp temperature and pressure jump conditions, and diffused interface method with mass flux projection correction scheme for accurate and numerically stable phase change implementation. The numerical method shows good agreement with analytical solutions of adiabatic Taylor bubble flow. Dimensionless parameters: the Reynolds number, the capillary number, the Froude number and the Bond number have been considered in a series of parametric studies to characterize the bubble shape and identify their effects on heat transfer rate enhancement for evaporating Taylor bubble flow.