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The accurate thermal conductivity of fouling plays a very significant role in  designing heat exchanger. In this paper, a novel method of calculating the  effective thermal conductivity (ETC) of particulate fouling is put forward  by using Image-Pro-Plus image processing, the finite element method and  ANSYS parametric design language (APDL). First of all, according to the  analysis on the particulate fouling samples features, the particulate  fouling is considered as porous media with fractal characteristics, whose  microscopic network model is established using the finite element method,  and each unit body material properties are randomly assigned by APDL.  Secondly, ETC of particulate fouling model is calculated by the steady state  plate method. And then, the influence of particulate fouling microstructure  on ETC is explored. Last, it is also show that the calculation resulting of  ETC agrees well with available experimental data and empirical correlation.  Moreover, it has been shown that ETC of particulate fouling is closely  associated with the porosity and pore size. The method can be used to  research on the thermal conductivity of fouling, discuss the influence of  microstructure on ETC of fouling, and provide the guidelines for designing  of heat exchanger on calculating accurate thermal conductivity of fouling.

A novel method for calculating effective thermal conductivity of particulate fouling