CATEGORY: FOULING
Proceedings of International Conference on Heat
Exchanger Fouling and Cleaning, June 9-14, 2013, Budapest, Hungary
When
is fouling too fast to measure thermally?
V. Y. Lister (1), J. F. Davidson (1) and D. I. Wilson (1)
vyl20@cam.ac.uk
1 Dept. of Chemical Engineering and Biotechnology, University of Cambridge,
Cambridge, UK
Abstract
Many
fouling tests employ an analysis of the change in heat transfer and thermal
resistance to monitor fouling quantitatively. This approach is based on the
assumption of momentary steady state. A mathematical analysis considering the
validity of this steady state approach is described for three sets of boundary
conditions commonly employed in fouling tests, and criteria for when the
results are reliable are presented.
An example of how ageing can affect the validity of the steady state
approach is also presented. A short survey of experimental studies of fouling
presented in the literature shows that gas-side particulate fouling is likely
to contravene the reliability criteria, indicating that non-thermal methods
should be used to study this phenomenon.
Free Full Text Source: http://www.heatexchanger-fouling.com/papers/papers2013/24_Lister_F.pdf
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