Is there relationship between wall roughness and sand grain height, and what will be sand grain height if we know wall roughness Ra 0.59?

03 March 2022 1 2K Report

Hello,

I am studying the effect of wall roughness on particle transport using CFD "Ansys". I have the wall roughness Ra=0.55, 0.73, what should I put or use in wall boundary condition for sand grain height (m). Is there relationship between wall roughness and sand grain height.

Thank you

Luiz Alberto Pereira das Neves Franco

The following paper might help: Adams, T., Grant, C. & Watson, H., A simple algorithm to relate measured surface roughness to equivalent sand-grain roughness, Int. Journal of Mechanical Engineering and Mechatronics, Vol 1, Issue 1, 2012.

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