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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Removal of particles from powdery fouled surfaces

Get access (open in a dialog) DOI: 10.1615/IHTC12.1750
6 pages

Abstract

Particulate fouling is defined as the deposition of unwanted particles on heat exchange surfaces. For a complete description of the growth rate of a fouling layer, the removal mechanism needs to be included. Deposited particles can be removed from the fouling layer by the shear stress of the fluid flow and also because of an incident particle impact. Both mechanisms are studied and presented. Particles can be detached from the fouled surface if the flow velocity is higher than a certain limit (critical flow velocity). The critical flow velocity is determined as function of the flow temperature and the particle's diameter and material. Particles can also be removed due to an impact of an incident particle, if the incident kinetic energy is high enough to release other particles. This amount of energy can be determined experimentally as function of the layer structure and the incident particle diameter. Preliminary experiments are performed which show the removal of particles as function of impact speed.