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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

THE DYNAMICS OF SOLID PARTICLE AND BUBBLE GROUPS

Get access (open in a dialog) DOI: 10.1615/IHTC10.5650
pages 283-288

Abstract

Two-phase flows consisting of liquid/bubble and liquid/solid particle mixtures occur in many industrial processes, which often involve both chemical reactions and heat transfer. This paper discusses the dynamics of discrete groups of either solid particles or bubbles released under gravity into quiescent fluid, and compares the experimental results with a simple theoretical model. The experimental work showed that the initial flow generated on the release of either solid particles or bubbles closely resembles that of a single-phase thermal (e.g. Turner, 1973). As the two-phase system evolves, the discrete particles or bubbles migrate through the circulation pattern and finally enter a state of free-fall. The model, which uses an expanding Hill's spherical vortex for the background fluid flow, can be used to predict individual particle or bubble motions. The particle/bubble paths generated by the model are shown to lie within the limits given by the experimental results.