Theoretical analysis of the thermal resistance of non-uniform fouling on cross-flow heat exchanger tubes

Owen, I. and Buyruk, E. and Barrow, H. (1996) Theoretical analysis of the thermal resistance of non-uniform fouling on cross-flow heat exchanger tubes. Applied Thermal Engineering, 16 (1). pp. 43-50. ISSN 1359-4311

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Abstract

A theoretical analysis of steady-state heat conduction through homogenous fouling on the external surface of tubes in cross-flow has been made. Modelling the fouling geometry as an eccentric annulus, a finite difference procedure in bipolar coordinates has been developed to predict the effect of fouling on the thermal performance. Theoretical predictions for a range of geometry, thermal conductivity and variable convection boundary conditions are presented. It is shown how, for a range of foulant thickness, eccentricity and thermal conductivity, the rate of heat transfer to a given size tube can be reduced or increased. The case of non-homogeneity of the fouling is explored with a view to extending the analysis towards varying thermal conductivity.

Keywords:Fouling, Heat Exchangers, Heat Transfer, Tubes, Boundary conditions, Finite difference method, Geometry, Heat conduction, Heat resistance, Mathematical models, Surfaces, Thermal conductivity, Cross-flow tubes, Eccentric annulus, Steady state condition, Tubes (components)
Subjects:H Engineering > H100 General Engineering
Divisions:College of Science > School of Engineering
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ID Code:18276
Deposited On:19 May 2017 13:58

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