NUMERICAL STUDY OF THE HEAT AND MASS TRANSFER CONDITIONS AT THE SURFACE OF A HEATED DROPLET

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.380
pages 517-525

Anna-Lena Ljung
Division of Fluid Mechanics, Luleå University of Technology, SE- 971 87, Luleå, Sweden

Staffan Lundstrom
Luleå university of technology

Abstract

This work aims to numerically investigate how the heat and mass transfer boundary conditions at a droplet surface should be presented in order to fully represent the surrounding fluid flow. With aid of Computational Fluid Dynamics, a numerical study is carried out to investigate the validity of the heat and mass transfer analogy at the droplet surface. Natural convection in the air surrounding the droplet, arising from the heated surface below the droplet, is considered. The heat and mass transfer analogy needs to be deliberated when the evaporation is dominated by density differences rather than temperature differences and the numerical results show this transition in detail.