Abstract
The paper presents key assumptions of the mathematical model which
describes heat and mass transfer phenomena in a solar sewage drying
process, as well as techniques used for solving this model with the Fluent
computational fluid dynamics (CFD) software. Special attention was paid to
implementation of boundary conditions on the sludge surface, which is a
physical boundary between the gaseous phase - air, and solid phase - dried
matter. Those conditions allow to model heat and mass transfer between the
media during first and second drying stages. Selection of the
computational geometry is also discussed - it is a fragment of the entire
drying facility. Selected modelling results are presented in the final
part of the paper.
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