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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL STUDY ON THE EFFECT OF INCLINATION ON HEAT AND MASS TRANSFER OF ZEOTROPIC MIXTURE

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.024113
pages 6583-6592

Abstract

A numerical simulation is conducted to study the effect of inclination on the heat and mass transfer of zeotropic mixture of isobutene and pentane during flow boiling. A 2D channel with four different inclinations, 0°,5°,10°,15°, is used in the simulation, in which the gas and liquid phases flow in a fair-current direction. The effective diffusion model and volume of fluid (VOF) multiphase model are applied to describe the heat and mass transfer characteristics of two-phase flow. The source terms in the continuity, momentum, energy and species conservation equations and the properties of the mixture and its components are coded in User Defined Functions (UDF). The numerical results indicate that the inclination noticeably influences the characteristics of zeotropic mixture during flow boiling. The heat fluxes at the top and bottom walls increase with the inclination increasing and the bottom wall is more susceptible to the inclination. The heat transfer coefficient at bottom wall increases by increasing the inclination due to the interaction of heat flux and temperature difference. The velocity of liquid increases while the velocity of gas decreases with increase in the inclination reflecting the decrease in mass transfer on the interface. The gas velocity is parabolic caused by the effect of interface and top wall additionally. Due to the evaporation of isobutene in liquid, the mass fraction of isobutene in gas increases along with the pipe and the effect of inclination on the mass fraction of isobutene in gas is only near the interface.