Thermophoretic effects on submicron particle deposition in turbulent flow

Authors: Chiu, C. H.; Wang, C. M.; Chiou, M. C.

Source: Acta Mechanica, Volume 170, Numbers 3-4, July 2004 , pp. 213-226(14)

Publisher: Springer

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Abstract:

Based on the model of surface renew and penetration the local cumulative sub-micron particle deposition from a turbulent flow onto a tube wall has been theoretically predicted. The conjoint effects of eddy diffusion, Brownian diffusion, and thermophoresis are considered in the deposition process. The quantitative predictions of mean particle deposition velocity coupled with appropriate estimates of the mean residence time are evaluated by comparison with previous models and experimental measurements. The thermophoretic effect can decrease particle transfer by about two orders of magnitude and fluctuates with particle size, Reynolds number and temperature gradient. Results show similar trends to the previous predictions and good agreement for the percentage change in deposition relative to that obtained under the isothermal conditions.

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s00707-004-0124-z

Affiliations: 1: Department of Vehicle Engineering, 011011011011011011011National Huwei University of Technology, 01101101101101101101164 Wenhua Road, Huwei, Yunlin, Taiwan,

Publication date: 2004-07-01