Abstract
In order to discover the fouling characteristic inside enhanced tubes,the particulate fouling tests including one smooth tube and three internal repeated rib tubes with different geometry designs were carried out.Foulant in the particulate fouling tests was aluminum oxide and ferric oxide,which had an average diameter of 1.75 μm and 2.11 μm,respectively.The foulant concentration was about 1500 mg/L and the heat flux in the test section was about 13 kW/m2.The experimental results show that the plane tube has the smallest fouling resistance,and the next is rib tube of product code 30/10,30/20,15/10.A semi-theoretical model was developed to investigate the main factors of particulate fouling formation from the fouling tests.The fouling model which started from the mass balance model considered the influences of the mass transfer coefficient,wall shear stress,sticking probability and deposit bond strength factor.The model analysis results fit the experimental data well.After some simplifications,the 2D numerical models for the experimental tubes were established,in which volume-control method and standard k-ω model were used.To explain the diversity of anti-fouling performance in different tubes,the influences of velocity field near wall and wall shear stress to the particulate fouling deposition were also discussed.It is found that that the fouling resistance decreases with the increase of the wall shear stress which is affected by the fin distance.The numerical results had reasonable deviations with the experimental data.
Published Version
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