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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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Year 1996

• 1International Symposium on Transient Convective Heat Transfer
19 - 23 August, 1996, Çesme, Turkey

600 pages

Volume price - $179.00

STUDY ON THE EFFECTS OF FREE CONVECTION AND ELEVATED PRESSURE ON TRANSIENT DROPLET EVAPORATION

A. Ali Cherif
Laboratoire de Mécanique, Acoustique et Instrumentation, UPRES EA 1945, Université de Perpignan, 52 Avenue de Villeneuve, 66860 Perpignan Cedex - France

M. Bouaziz
Laboratoire de Mécanique, Acoustique et Instrumentation, UPRES EA 1945, Université de Perpignan, 52 Avenue de Villeneuve, 66860 Perpignan Cedex - France

X. Chesneau
Laboratoire de Mecanique, Acoustique et Instrumentation, Universite de Perpignan 52, Avenue de Villeneuve, 66860 PERPIGNAN Cedex - France

A. Daif
Laboratoire de Mécanique, Acoustique et Instrumentation, UPRES EA 1945, Université de Perpignan, 52 Avenue de Villeneuve, 66860 Perpignan Cedex - France

ABSTRACT

In this paper, we present a model for pure fuel droplet evaporation at high pressure with natural convection. The principle of the method uses the film theory : heat and mass transfer between droplet surface and ambiant gas takes place in a thin film around the droplet. In addition, in order to take natural convection into account, we first of all write and resolve local equations for a limited gas phase around a porous sphere. With this calculation, we able to estimate the corresponding mean Nusselt and Sherwood numbers in terms of mass and thermal Grashof numbers and thus determine the thickness of the gas film. In the first section of this paper, we present the numerical method and the correlation obtained for taking natural convection into account. In the last section of this paper, we present a comparison between our numerical results and experimental and numerical results in the appropriate literature.