Abstract
If we describe the progress of a thermal fouling process by a plot of thermal fouling resistance, Rf, against time, t, then the three upper curves of Figure 1 represent the most common and primitive, though not the only, configurations observed in practice. These are designated linear, falling rate (non-asymptotic) and (falling rate) asymptotic, respectively. A delay period, tD, is often, but not always and not consistently, observed before any appreciable fouling is recorded after starting an experiment or a process with an apparently clean heat transfer surface. The delay period is frequently much less reproducible than the subsequent fouling curve. The cleanliness of the initial heat transfer surface can be a crucial factor. Thus the presence of a measurable delay period in Figure 2 for the upper heater but none for the spare heater is probably related to the fact that the former was reported by the operator to be in a cleaner condition than the latter at time zero [1].
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© 1988 Kluwer Academic Publishers
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Epstein, N. (1988). General Thermal Fouling Models. In: Melo, L.F., Bott, T.R., Bernardo, C.A. (eds) Fouling Science and Technology. NATO ASI Series, vol 145. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2813-8_2
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DOI: https://doi.org/10.1007/978-94-009-2813-8_2
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