13082 KB200 KB0 KB2020Gomboc, TimiHriberšek, MatjažVIII, 107 str., 30 cmCOBISSID:33807107URN:URN:NBN:SI:doc-5MNFPZPSslT. Gombocvisokošolska delaboundary elements methodcomputational fluid dynamicscoupled model for heat and mass transferDisertacijedoktorske disertacijekinetika sušenja poroznih delcevmetoda robnih elementovporous particle dryingporous particle drying kineticračunalniška dinamika tekočinrazpršilno sušenjesklopljen model za prenos toplote in snovispray dryingSušenjesušenje poroznih delcevSklopljen model prenosa toplote in snovi med delcem in tokom tekočine pri razpršilnem sušenju na osnovi metode robnih elementov| doktorska disertacija|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 resultsSušenje vlažnih snovi je ena izmed najstarejših procesnih tehnik, ki se uporablja na mnogih industrijskih področjih. Pri sušenju obravnavamo zapletene fizikalne procese, ki obsegajo vezan večfazni prenos toplote, snovi in gibalne količine. Kadar obravnavamo sušenje delcev ki so porozni, moramo proces sušenja obravnavati v več stopnjah, saj delci poleg vlage na površini vsebujejo še vlago v notranjosti. V doktorski nalogi je obravnavan razvoj numeričnega modela za izračun sušenja poroznih delcev v toku sušilnega plina, pri čemer je reševanje problema izvedeno v sklopu Euler-Lagrange modela računalniške dinamike tekočin. Tako je za numerično rešitev dvofaznega prenosa toplote s premikajočo fazno mejo znotraj gibajočega se delca bil razvit numerični model na osnovi Metode robnih elementov. Razvit je bil tudi nov model za izračun povezave prenosa toplote in snovi znotraj delca s prenosom toplote in snovi v toku sušilnega plina, in sicer z nadgradnjo modela točkovnega izvora v Metodi robnih elementov za nestacionarni prevod toplote v model, ki upošteva tudi konvektivni prenos toplote in snovi v sušilnem plinu. Izvedeni testni primeri potrjujejo primernost razvitih numeričnih modelov za prostorski in časovni izračun sušenja delcev v toku sušilnega plinaTEXTvisokošolska delatheses and dissertationsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Mariboru, Fakulteta za strojništvo