Browsing by Author "Çoban S.Ö."

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    3D numerical study of heat and mass transfer of moving porous moist objects
    (Elsevier Ltd, 2021) Çoban S.Ö.; Selimefendigil F.; Öztop H.F.
    Heat and moisture transfer of two moving moist objects in a channel with convection of hot dry air is investigated numerically. A moving mesh approach is used for providing movement by means of the Arbitrary Lagrangian-Eulerian (ALE) framework. Governing equations for flow field and porous objects are solved by finite element discretization method for the 3D transient problem. Effects of drying air velocity and temperature are simulated by means of temperature, moisture content and heat transfer distributions. Results showed the importance of varying parameters on drying behavior. It was observed that the air velocity also has an increasing effect on evaporation and most reduction in moisture content is obtained at 0.8 m/s air velocity with 63.12% loss. Besides, there are insignificant differences between heat transfer values for fixed and moving objects, differences in average heat transfer values calculated between 6 and 13% for static bed and moving bed. © 2021 Elsevier Ltd
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    Investigation of time dependent heat and mass transportation for drying of 3D porous moist objects in convective conditions
    (Elsevier Masson s.r.l., 2021) Selimefendigil F.; Çoban S.Ö.; Öztop H.F.
    Three-dimensional numerical study of convective drying process was investigated for two porous moist blocks in a channel under turbulent flow conditions by considering different parameters which are effective on heat and moisture transfer phenomena. The 3D unsteady flow and heat and mass transfer equations were solved with Galerkin weighted residual finite element method. Drying objects were rectangular shaped porous objects and effects of size and distance between the objects, velocity and temperature of inlet drying air were investigated with varying values. Transport of heat and moisture for the problem was evaluated. Obtained results showed that all of the changing parameters had significant effects on flow properties, heat and mass transfer phenomena in 3D. As the interspacing between the blocks increases, it has a positive impact on the drying process especially for second porous block even though it is not as effective as the velocity or the size. As the height of the porous block increases, due to the blockage effect it has adverse effects on the transportation phenomena. © 2020 Elsevier Masson SAS