| 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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