CFD Online Discussion Forums - Heat transfer coefficient due to coal surface reaction

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Heat transfer coefficient due to coal surface reaction

Hi, formers,

In the ReactingMultiphaseParcel.C, after calculating the heat of coal surface reaction (hReaction), one part will be left for particle (Sh), the other part will be transfered to gas (dhsTrans). However, the former part (coeff) is related with particle temperature "T/Tmax". I don't know why use this relation. Can anybody please give some explaination? Thank you in advance.

Code:

670* const scalar xsi = min(T/cloud.constProps().TMax(), 1.0);

671* const scalar coeff =

672* (1.0 - xsi*xsi)*cloud.constProps().hRetentionCoeff();

673*

674* Sh += coeff*hReaction/dt;

675*

676* dhsTrans += (1.0 - coeff)*hReaction;