4.7 Article

Effect of transverse triangular wedges on the behavior of the ash deposition and heat transfer of an inline tube bundle

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Effect of transverse triangular cross-sectional wedges on the asymptotic fouling deposition behavior of the flow through an inline tube bundle

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Summary: Deposition on a superheater and economizer tubes can lead to fouling thermal resistance and increased flow pressure drop, resulting in higher operating costs. The use of high-grade fuel can help reduce the deposition effect, but it is expensive. Computational fluid dynamics software or lumped models can be used to predict deposition behavior. A novel passive approach involving installing isosceles triangle wedges on tubes can decrease deposition by increasing wall shear stress due to flow. Experimentation with different wedge configurations showed varying effects on overall thermal resistance and deposition rates.

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