Sklopljen model prenosa toplote in snovi med delcem in tokom tekočine pri razpršilnem sušenju na osnovi metode robnih elementov : doktorska disertacija

slovenian

doktorska dela

2020

boundary elements method   computational fluid dynamics   coupled model for heat and mass transfer   porous particle drying   porous particle drying kinetic   spray drying

Univerza v Mariboru, Fakulteta za strojništvo

Drying of porous particles is one of the oldest process technique which is used in different industrial applications. In drying processes, we consider complex physical processes which involve coupled multiphase heat, mass and momentum transfer. By the porous particle drying, drying process have to be treated in more stages because particles beside surface moisture includes moisture in his interior. After surface moisture removing, drying process moves in particles interior where heat transfer in particles interior has to be solved. Energy needed for drying process is supplied by hot drying gas. Through the drying process heat and mass exchange between particles and drying gas occur which results in local change of drying gas conditions. One of the most important informations in particle drying process is a drying time. To get the accurate results all interactions (drying air to particle and particle to drying air) need to be considered. In present work the 3D-axisymmetrical model for heat transfer in the spherical porous particle and fully coupled model for heat and mass transfer between particles and drying gas on the base of Boundary Elements Method was developed. Particles in coupled model were modeled as points. Results represented in this work show that keeping of coupling between particles and drying gas is very important to provide the accurate results.

08.08.2023