DRYING OF HIGHLY POROUS PARTICLE AGGREGATES: PORE-SCALE SIMULATION AND X-RAY MICROTOMOGRAPHY
A 3D numerical simulation and experimental study on convective drying of highly porous particle aggregates is presented in this paper.A computational tool based on the volume-of-fluid (VOF) approach was developed to simulate the liquid distribution over time in an aggregate subjected to drying.The effect of wettability is studied by carrying out simulations for different values of the equilibrium contact angle.Capillary effects are more pronounced for smaller equilibrium contact angles.Highly porous real particle aggregates were produced by the sintering of glass beads inside a graphite mold.X-ray microtomography ( μ -CT) and image analysis have been used to obtain the 3D spatial distributions of the solid, liquid, and gas phases in a loose packing of sintered glass beads.These measurements are used to validate the computational tool.It shall then give insight into the pore-scale phenomena and, as a long-term objective, into the micromechanical behavior of particle aggregates during convective drying.
volume-of-fluid method X-ray microtomography convective drying sintered porous structures
Abdolreza Kharaghani Yujing Wang Christoph Kirsch Thomas Metzger Evangelos Tsotsas
Thermal Process Engineering,Otto von Guericke University,P.O.Box 4120,39016 Magdeburg,Germany Department of Mathematics,University of North Carolina at Chapel Hill,NC 27599-3250,USA
国际会议
The 7th Asia-Pacific Drying Conference(第七届亚太地区干燥会议 ADC2011)
天津
英文
1-8
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）