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The main objective of this paper is to present a generic modelling framework,for the diffusive mass transport through the turbulent, reactive boundary layerof multi-component fluid mixtures that precipitate on the wall. The modellingis based on Maxwell-Stefan diffusion in multi-component mixtures, therelaxation to chemical equilibrium model, and the single-phase Navier-Stokesequations. Final-ly, turbulence is introduced by Reynolds-averaging. Thegoverning equations are simplified in accordance with common assumptions ofcomputational fluid dynamics (CFD), and based on the assumption that theover-all bulk flow is parallel to the wall, 1-dimensional equations for thespecies and heat transport perpendicular to the wall have been formulated. Theequations are solved on a fine grid in order to fully resolve the boundarylayer, and the effect of allowing/disallowing deposition and chemical reactionswas investigated for a simplified test-case (4-component ideal mixture ofperfect gasses capable of chemical reaction and sublimation fouling).  The developed framework can be employed as a sub-grid model for directprecipitation/crystallization/solidifica-tion fouling in coarse grid CFDmodels.

A wall-function approach for direct precipitation/crystallization fouling in cfd modelling