Title: Discrete pore network modeling of superheated steam drying
Authors : Le, Kieu Hiep
Kharaghani, Abdolreza
Kirsch, Christoph
Tsotsas, Evangelos
Published in : Drying Technology
Volume(Issue) : 35
Issue : 13
Pages : 1584
Pages to: 1601
Publisher / Ed. Institution : Taylor & Francis
Issue Date: 2016
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subject (DDC) : 660: Chemical engineering
Abstract: A nonisothermal two-dimensional pore network model is developed to describe the superheated steam drying of a capillary porous medium. The complex void space is approximated by a network of spherical pores interconnected by cylindrical throats. In this model, the condensation of water vapor at the network surface as well as the network drying are taken into account. During the network drying period, the liquid transport is driven by capillary action, whereas vapor transport occurs because of convection. The condensation of water vapor within the pores is modeled based on newly formulated liquid invasion rules. The simulation results, presented as temperature and moisture content profiles over time, indicate qualitative agreement with available experimental observations. The inclusion of the liquid invasion rules is shown to accommodate more of the condensed water mass compared to earlier models, in which condensation is only partly treated. Due to the viscous vapor flow, the vapor overpressure within the network, which is the driving force of vapor transport, is reproduced in these simulations. The influence of vapor overpressure on the disintegration of the liquid phase is also discussed.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific Journal
DOI : 10.1080/07373937.2016.1264414
ISSN: 0737-3937
1532-2300
URI: https://digitalcollection.zhaw.ch/handle/11475/12348
Appears in Collections:Publikationen School of Engineering

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