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Journal of Porous Media
IF: 1.49 5-Year IF: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Print: 1091-028X
ISSN Online: 1934-0508

Volumes:
Volume 23, 2020 Volume 22, 2019 Volume 21, 2018 Volume 20, 2017 Volume 19, 2016 Volume 18, 2015 Volume 17, 2014 Volume 16, 2013 Volume 15, 2012 Volume 14, 2011 Volume 13, 2010 Volume 12, 2009 Volume 11, 2008 Volume 10, 2007 Volume 9, 2006 Volume 8, 2005 Volume 7, 2004 Volume 6, 2003 Volume 5, 2002 Volume 4, 2001 Volume 3, 2000 Volume 2, 1999 Volume 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.2019027028
pages 81-99

INVESTIGATION OF MIXING PROCESS OF TWO DIFFERENT GASES IN A MICROMIXER: EFFECT OF POROUS MEDIUM AND KNUDSEN NUMBER

Farzad Pourfattah
Department of Mechanical Engineering, University of Kashan, Kashan, Iran
Davood Semiromi Toghraie
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
Omid Ali Akbari
Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
Mahsa Adhampour
Department of Mechanical Engineering, Urmia University of Technology, Urmia, Iran
Amin Shahsavar
Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran

ABSTRACT

In the present research, by using finite volume method and applying a first-order slip boundary condition, the effect of porous media on the mixing process of CO and N2 gases in the T-shaped micromixer is investigated. The effect of the permeability coefficient of the porous medium (Darcy number) and its length on the quality of mixing and heat transfer have been investigated. The results indicate that the increase of the length of porous medium leads to an increase of the length of entrance region by blocking the flow and causes the improvement of the mixing process and reduction of the mixing lengths. The obtained results show that, by decreasing Darcy number, the quality of mixing has been improved and the mixing length is reduced. According to the results, when there is no porous media, the complete mixing is accrued at x/L = 0.54, and the presence of the porous media (Da number = 0.001, length of porous media = 2 μm) leads to complete mixing at x/L = 0.2. The results demonstrate that the use of a porous medium reduces the thermal entrance length and increases the temperature difference between gases and micromixer walls that causes the reduction of heat transfer coefficient and Nusselt number. The results show that when there is no porous media the Nusselt number is 4, whereas with the existence of the porous media (Da number = 0.001, length of porous media = 2 μm) the Nusselt number is 1.9. The influence of Knudsen number on the mixing efficiency is investigated, too. According to the results, by increasing Knudsen number, the heat transfer and friction coefficient decrease; however, due to the improvement of permeability of species, because of Knudsen number increment, the mixing has been improved and the length of mixing reduces.

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