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Nonwetting flow of a liquid through a packed bed with gas cross-flow

Gupta, GS and Litster, JD and White, ET and Rudolph, VR (1997) Nonwetting flow of a liquid through a packed bed with gas cross-flow. In: Metallurgical and Materials Transactions B, 28 (4). pp. 597-604.

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Abstract

In this study, the effect of a cross-flow gas field on the percolating flow of a non-wetting liquid through a packed bed was investigated. Experiments were conducted to measure the liquid shift, due to the cross-flow of air, for the flow of aqueous barium chloride solutions and mercury percolating through beds of polyethylene and expanded polystyrene particles. An X-ray technique was used to visualize the liquid flow pattern through the packed bed. The liquid percolates through a packed bed as a series of rivulets and droplets which are continuously breaking up and coalescing. A mathematical model to predict the direction of the liquid rivulet/droplet flow under the influence of a gas flow field was developed. The model treats the liquid as a discrete phase and includes the effects of gravity, gas drag, and inertial and viscous bed resistance. The effective droplet/rivulet size is an important model parameter, and the model postulates that the droplet/rivulet size is a function of both the effective capillary size of the bed and the liquid flow rate. A simplified population balance analysis for droplet coalescence is used to predict the effect of liquid flow rate on droplet/rivulet size. The model predictions are consistent with the experiments.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Minerals, Metals & Materials Society.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 18 May 2007
Last Modified: 27 Aug 2008 12:40
URI: http://eprints.iisc.ernet.in/id/eprint/10021

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