Numerical study on evaporation of spherical droplets impinging on the wall using Volume of Fluid (VOF) model

Paper #:
  • 2017-01-0852

Published:
  • 2017-03-28
Abstract:
This paper aims to present the results of numerical modeling and simulation of evaporation of single and multiple spherical n-heptane droplets impinging on a hot wall at a temperature above the Leidenfrost temperature at atmospheric pressure. Volume of Fluid (VOF) method is chosen for tracking the liquid gas interface and an open source CFD software, OpenFOAM, is chosen for modeling and simulations. The capability of VOF method implemented in interDyMFoam solver of OpenFOAM to simulate hydrodynamics during droplet-droplet interaction and droplet-film interaction is explored. The in-built solver is used to simulate problems in isothermal conditions and the simulation results are compared qualitatively with the published results to validate the solver. A numerical method for modeling heat and mass transfer during evaporation is implemented in conjunction with the VOF. An additional vapor phase is introduced apart from the liquid and gas phases to understand the mixing and diffusion of vapor and gas phases. The evaporation model is validated quantitatively and qualitatively with fundamental problems having analytical solutions and published results. The effect of mesh dependency is studied with meshes of three different levels of refinement. The influence by droplet number on evaporation is studied using simulations of multiple droplets impinging on hot wall at a fixed temperature and a constant non-dimensional distance between droplets
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