Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Pore network simulations of heat and mass transfer inside an unsaturated capillary porous wick in the dry-out regime
Authors: Le, Kieu Hiep
Kharaghani, Abdolreza
Kirsch, Christoph
Tsotsas, Evangelos
DOI: 10.1007/s11242-016-0737-4
Published in: Transport in Porous Media
Volume(Issue): 114
Issue: 3
Pages: 623
Pages to: 648
Issue Date: 2016
Publisher / Ed. Institution: Springer
ISSN: 0169-3913
1573-1634
Language: English
Subject (DDC): 530: Physics
Abstract: In this work, a two-dimensional pore network model is developed to study the heat and mass transfer inside a capillary porous wick with opposite replenishment in the dry-out regime. The mass flow rate in each throat of the pore network is computed according to the Hagen-Poiseuille law, and the heat flux is calculated based on Fourier’s law with an effective local thermal conductivity. By coupling the heat and the mass transfer, a numerical method is devised to determine the evolution of the liquid-vapor interface. The model is verified by comparing the effective heat transfer coefficient versus heat load with experimental observations. For increasing heat load, an inflation/deflation of the vapor pocket is observed. The influences of microstructural properties on the vapor pocket pattern and on the effective heat transfer coefficient are discussed: A porous wick with a non-uniform or bimodal pore size distribution results in a larger heat transfer coefficient compared to a porous wick with a uniform pore size distribution. The heat and mass transfer efficiency of a porous wick comprised of two connected regions of small and large pores is also examined. The simulation results indicate that the introduction of a coarse layer with a suitable thickness strongly enhances the heat transfer coefficient.
URI: https://digitalcollection.zhaw.ch/handle/11475/12340
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Appears in collections:Publikationen School of Engineering

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