Author/Authors :
Siqueira, A. M. O Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil , Krink, N Technische Universität Berlin, Berlin, Germany , Pereira, F. P. S Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil , Villela, F. G Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil , Silva, G. S Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil , Moura, A. F Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil
Abstract :
A one-dimensional mathematical model for the description of solar drying of beds of sewage sludge is
developed and implemented with the software Engineering-Equation-Solver. After the discussion of relevant
literature, the assumptions and general conditions of the model are explained. Governing differential
equations for heat and mass transport inside the sludge are derived, followed by a discussion about
correlations used for the determination of surface transport phenomena and for the description of
thermophysical properties. Numerical discretization is achieved locally through the Finite Difference Method
and temporary through the Runge-Kutta-Method. Finally, a parametric analysis on the sludge drying process
is carried out. The obtained results demonstrate the effect of ambient parameters such as solar radiation,
airflow rate, gas temperature, geometric aspects etc. on the drying process. The developed model may be used
for further prediction and estimation of drying characteristics under several conditions.
Keywords :
Porous material , Simulation , Mathematical model , Dryer performance , Heat and mass transfer
