Relationship between diffusion boundary layer thickness and eutectic reaction?

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Chandra Bhanu Basak

It is difficult to answer without seeing any microstructure and your question is also not very clear.

Ger Koper

In general, one considers both diffusion rate and convection rate. The thickness is the boundary where these two are of comparable magnitude ("equal"). Your convection rate is the reaction rate, diffusion is what you describe.