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Heat and mass transfer and chemical transformation in a cerium nitrate droplet

Pathak, Binita and Basu, Saptarshi and Kumar, Ranganathan (2013) Heat and mass transfer and chemical transformation in a cerium nitrate droplet. In: International Journal of Heat and Mass Transfer, 63 . pp. 301-312.

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Official URL: http://dx.doi.org/10.1016/j.ijheatmasstransfer.201...

Abstract

This paper deals with the thermo-physical changes that a droplet undergoes when it is radiatively heated in a levitated environment. The heat and mass transport model has been developed along with chemical kinetics within a cerium nitrate droplet. The chemical transformation of cerium nitrate to ceria during the process is predicted using Kramers' reaction mechanism which justifies the formation of ceria at a very low temperature as observed in experiments. The rate equation modeled by Kramers is modified suitably to be applicable within the framework of a droplet, and predicts experimental results well in both bulk form of cerium nitrate and in aqueous cerium nitrate droplet. The dependence of dissociation reaction rate on droplet size is determined and the transient mass concentration of unreacted cerium nitrate is reported. The model is validated with experiments both for liquid phase vaporization and chemical reaction. Vaporization and chemical conversion are simulated for different ambient conditions. The competitive effects of sensible heating rate and the rate of vaporization with diffusion of cerium nitrate is seen to play a key role in determining the mass fraction of ceria formed within the droplet. Spatially resolved modeling of the droplet enables the understanding of the conversion of chemical species in more detail.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Acoustic Levitation; Heat and Mass Transfer; Chemical Reaction; Droplet Vaporization; Nanoceria; Droplet Agglomeration
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Francis Jayakanth
Date Deposited: 05 Aug 2013 11:46
Last Modified: 05 Nov 2018 10:57
URI: http://eprints.iisc.ac.in/id/eprint/46897

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