A simplified model for bi-component droplet heating and evaporation

Sazhin, S.S., Elwardany, A.E., Krutitskii, P.A., Castanet, G., Lemoine, F., Sazhina, E.M. and Heikal, M.R. (2010) A simplified model for bi-component droplet heating and evaporation International Journal of Heat and Mass Transfer, 53 (21-22). pp. 4495-4505. ISSN 0017-9310

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Abstract

A simplified model for bi-component droplet heating and evaporation is developed and applied for the analysis of the observed average droplet temperatures in a monodisperse spray. The model takes into account all key processes, which take place during this heating and evaporation, including the distribution of temperature and diffusion of liquid species inside the droplet and the effects of the non-unity activity coefficient (ideal and non-ideal models). The effects of recirculation in the moving droplets on heat and mass diffusion within them are taken into account using the effective thermal conductivity and the effective diffusivity models. The previously obtained analytical solution of the transient heat conduction equation inside droplets is incorporated in the numerical code alongside the original analytical solution of the species diffusion equation inside droplets. The predicted time evolution of the average temperatures is shown to be reasonably close to the measured one, especially in the case of pure acetone and acetone-rich mixture droplets. It is shown that the temperatures predicted by the simplified model and the earlier reported vortex model are reasonably close. Also, the temperatures predicted by the ideal and non-ideal models differ by not more than several degrees. This can justify the application of the simplified model with the activity coefficient equal to 1 for the interpretation of the time evolution of temperatures measured with errors more than several degrees.

Item Type: Journal article
Uncontrolled Keywords: Droplets; Multi-component fuel; Heating; Evaporation; Diffusion equation; Acetone; Ethanol
Subjects: H000 Engineering > H300 Mechanical Engineering > H330 Automotive Engineering
DOI (a stable link to the resource): 10.1016/j.ijheatmasstransfer.2010.06.044
Faculties: Faculty of Science and Engineering > School of Computing, Engineering and Mathematics > Engineering and Product Design Research > Automotive Engineering
Depositing User: editor engineering
Date Deposited: 22 Nov 2011 09:45
Last Modified: 19 Apr 2012 10:07
URI: http://eprints.brighton.ac.uk/id/eprint/8357

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