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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Analytical and numerical modelling of convective and radiative heating of fuel droplets in diesel engines

Sergei S. Sazhin
Advanced Engineering Centre, School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, UK

Leonid A. Dombrovsky
Joint Institute for High Temperatures 17 A, Krasnokazarmennaya Street, Moscow, 111116, Russian Federation

P. A. Krutitskii
Faculty of Physics, Moscow State University, Vorobyovy Gory, Moscow, 119899, Russia

Elena M. Sazhina
School of Engineering, Faculty of Science and Engineering, University of Brighton, Cockcroft, Building, Brighton BN2 4GJ, United Kingdom

Morgan R. Heikal
Advanced Engineering Centre, School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, UK

Abstract

A simple model for convective heating of droplets, which takes into account their nite thermal conductivity and internal recirculation, is discussed. This model is based on the parabolic approximation of the temperature pro les inside droplets. The approximation of the average absorption efficiency factor of semi-transparent droplets by the expression arbdi, where rdi are the droplet radii, and a and b are quadratic functions of gas temperature, is discussed. The simplicity of both models makes them particularly convenient for implementation into CFD codes. Preliminary results of implementation of both models into the CFD code VECTIS of Ricardo Consulting engineers are presented.

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