Pore network simulations of heat and mass transfer inside an unsaturated capillary porous wick in the dry-out regime

Le, Kieu Hiep; Kharaghani, Abdolreza; Kirsch, Christoph; Tsotsas, Evangelos

doi:10.1007/s11242-016-0737-4

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-12340

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 10.21256/zhaw-12340
Published in:	Transport in Porous Media
Volume(Issue):	114
Issue:	3
Page(s):	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.
Further description:	Erworben im Rahmen der Schweizer Nationallizenzen (http://www.nationallizenzen.ch)
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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Le, K. H., Kharaghani, A., Kirsch, C., & Tsotsas, E. (2016). Pore network simulations of heat and mass transfer inside an unsaturated capillary porous wick in the dry-out regime. Transport in Porous Media, 114(3), 623–648. https://doi.org/10.1007/s11242-016-0737-4

Le, K.H. et al. (2016) ‘Pore network simulations of heat and mass transfer inside an unsaturated capillary porous wick in the dry-out regime’, Transport in Porous Media, 114(3), pp. 623–648. Available at: https://doi.org/10.1007/s11242-016-0737-4.

K. H. Le, A. Kharaghani, C. Kirsch, and E. Tsotsas, “Pore network simulations of heat and mass transfer inside an unsaturated capillary porous wick in the dry-out regime,” Transport in Porous Media, vol. 114, no. 3, pp. 623–648, 2016, doi: 10.1007/s11242-016-0737-4.

LE, Kieu Hiep, Abdolreza KHARAGHANI, Christoph KIRSCH und Evangelos TSOTSAS, 2016. Pore network simulations of heat and mass transfer inside an unsaturated capillary porous wick in the dry-out regime. Transport in Porous Media. 2016. Bd. 114, Nr. 3, S. 623–648. DOI 10.1007/s11242-016-0737-4

Le, Kieu Hiep, Abdolreza Kharaghani, Christoph Kirsch, and Evangelos Tsotsas. 2016. “Pore Network Simulations of Heat and Mass Transfer inside an Unsaturated Capillary Porous Wick in the Dry-out Regime.” Transport in Porous Media 114 (3): 623–48. https://doi.org/10.1007/s11242-016-0737-4.

Le, Kieu Hiep, et al. “Pore Network Simulations of Heat and Mass Transfer inside an Unsaturated Capillary Porous Wick in the Dry-out Regime.” Transport in Porous Media, vol. 114, no. 3, 2016, pp. 623–48, https://doi.org/10.1007/s11242-016-0737-4.