Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/6669
Title: A pore scale analysis for determination of interfacial convective heat transfer coefficient for thin periodic porousmedia undermixed convection
Authors: Çelik, Hasan
Mobedi, Moghtada
Manca, Oronzio
Özkol, Ünver
Çelik, Hasan
Özkol, Ünver
Keywords: Porous media
Heat transfer
Mixed convection
Interfacial heat transfer coefficients
Issue Date: 2017
Publisher: Emerald Group Publishing Ltd.
Source: Çelik, H., Mobedi, M., Manca, O., and Özkol, Ü. (2017). A pore scale analysis for determination of interfacial convective heat transfer coefficient for thin periodic porousmedia undermixed convection. International Journal of Numerical Methods for Heat and Fluid Flow, 27(12), 2775-2798. doi:10.1108/HFF-01-2017-0036
Abstract: Purpose - The purpose of this study is to determine interfacial convective heat transfer coefficient numerically, for a porous media consisting of square blocks in inline arrangement under mixed convection heat transfer. Design/methodology/approach - The continuity, momentum and energy equations are solved in dimensionless form for a representative elementary volume of porous media, numerically. The velocity and temperature fields for different values of porosity, Ri and Re numbers are obtained. The study is performed for the range of Ri number from 0.01 to 10, Re number from 100 to 500 and porosity value from 0.51 to 0.96. Based on the obtained results, the value of the interfacial convective heat transfer coefficient is calculated by using volume average method. Findings - It was found that at low porosities (such as 0.51), the interfacial Nusselt number does not considerably change with Ri and Re numbers. However, for porous media with high Ri number and porosity (such as 10 and 0.51, respectively), secondary flows occur in the middle of the channel between rods improving heat transfer between solid and fluid, considerably. It is shown that the available correlations of interfacial heat transfer coefficient suggested for forced convection can be used for mixed convection for the porous media with low porosity (such as 0.51) or for the flow with low Ri number (such as 0.01). Originality/value - To the best of the authors' knowledge, there is no study on determination of interfacial convective heat transfer coefficient for mixed convection in porous media in literature. The present study might be the first study providing an accurate idea on the range of this important parameter, which will be useful particularly for researchers who study on mixed convection heat transfer in porous media, macroscopically.
URI: http://doi.org/10.1108/HFF-01-2017-0036
http://hdl.handle.net/11147/6669
ISSN: 0961-5539
1758-6585
Appears in Collections:Mechanical Engineering / Makina Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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