M.Sc. Hafiz Tariq Mahmood
born 1988 in Bhakkar, Pakistan
December 2006 - May 2011
B.Sc. Chemical Engineering, University of the Punjab, Lahore, Pakistan
Bachelor Thesis: Production of Syngas by Auto Thermal Reforming of Natural Gas and Production of Methanol.
October 2011 - September 2013
MSc. Chemical and Energy Engineering, Otto von Guericke University, Magdeburg, Germany
Master Thesis: Modeling of annular liquid films by three-dimensional pore network drying model.
Since September 2014 (now on study leave)
Lecturer, Department of Chemical Engineering, University of Wah-Pakistan
Since October 2017
PhD Student, Chair of Thermal Process Engineering, Otto von Guericke University
Sponsored by Higher Education Commission (HEC) Pakistan and DAAD.
Discrete modeling of capillary ring structures during drying of particle aggregates
Although drying is a quite old method to remove liquid from a material, drying of porous materials is still an important topic to study transport phenomena at pore scale. Historically the drying problem has been addressed mostly by continuum approaches, which are based on volume-averaged quantities and the relation of fluxes to gradients via empirically determined coefficients. Due to the limitation of continuum models, discrete network approaches named pore network modelling are used to provide understanding and insights into the physics of phenomena that occur at the pore level.
Several mechanisms act simultaneously at the pore level during the convective drying process and affect its macroscopic behavior. The results of drying experiments with packings of glass beads saturated with water show that the liquid phase stays connected through liquid rings (thick films) at contact points between particles until very low water content. The conjecture of the discrepancy in drying rates obtained from the pore network simulation and from the drying experiment is due to the neglect of these liquid film effects in the pore network drying model.
The purpose of this study is to model the liquid rings in three-dimensional (3D) regular pore network drying model. Then compare regular 3D ring pore network model with regular 3D without ring model. Parametric study on this model will be conducted. After that, this model will be extended to predict the mass exchange between a particle aggregate surface and the adjacent gas-side boundary layer. Another milestone in this project will be to incorporate the liquid viscous effect into this pore network model.