Transport Phenomena Modeling During Drying of Shrinking Materials

摘要

Different kind of materials are usually submitted to drying. In some cases the aim is torndecrease their transportation costs in some others to preserve materials fromrndeterioration. The latter is the case of foods drying. Foods usually exhibit changes inrnshape and dimensions (known as shrinkage) during drying caused by water loss. Thernaim of the present work is the modeling of the transport phenomena involved in dryingrnprocess accounting for also the shrinkage effects. The simultaneous transfer ofrnmomentum, heat and mass occurring in a convective drier where hot dry air flows aboutrnthe food sample have been modeled. The system of non-linear unsteady-state partialrndifferential equations modeling the process has been solved by means of FiniternElements Method coupled to the ALE (Arbitrary Lagrangian Eulerian) procedure that,rnby a proper modification of integration domain, accounts for shrinkage effects. Thernmodel proposed is suitable for industrial equipment optimization.