Performance analysis of extended surfaces subjected to fouling |
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Authors: | H S Aparajith C Balaji V R Raghavan |
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Institution: | (1) Department of Chemical Engineering Indian Institute of Technology Madras, IN;(2) Heat Transfer and Thermal Power Laboratory Department of Mechanical Engineering Indian Institute of Technology, Madras, IN |
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Abstract: | The time dependent performance of extended surfaces subjected to fouling is addressed in this work. Where fins are used for
augmenting boiling heat transfer, the interaction of local values of temperature excess, fouling resistance and surface characteristics
of the deposit can be quite complex. Taking typical asymptotic fouling growth parameters from literature for reverse solubility
salts, three kinds of fin geometry are analysed – rectangular, triangular and annular. For various values of the fin parameter
mL, the temperature distribution and variation of fouling resistance are obtained as a function of time. To interpret the
performance of a fouled fin, a new term `cleanliness efficiency' is introduced. The necessity of choosing an optimal value
of mL for the fin is also highlighted here. It is shown that for all three fin configurations, cleanliness efficiency differs
little, thus simplifying the geometry dependence. The approach set out in this work will help in the design of finned heat
exchangers subjected to fouling and thereby minimise their overdesign.
Received on 12 July 2000 |
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