MHD liquid metal flow and heat transfer between vertical coaxial cylinders under horizontal magnetic field |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Thessaly, Athens Avenue, 38334 Volos, Greece;2. Department of Energy Technology, Technological & Educational Institute of Athens, Ag. Spyridona 17,12210 Egaleo, Greece;3. Statistical and Plasma Physics, Universite Libre de Bruxelles, Campus de la Plaine CP 231, Boulevard du Triomphe 1050, Bruxelles;1. Department of Engineering, University of Leicester, Leicester, LE1 7RH, UK;2. Department of Mathematics, Bursa Technical University, Bursa, 16330, Turkey;3. Centre for Fluid and Complex Systems, Coventry University, CV1 5FB Coventry, UK;4. School of Mathematics & Actuarial Science, University of Leicester, Leicester, LE1 7RH, UK |
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| Abstract: | Direct numerical simulations are presented of MHD liquid metal flow and heat transfer in vertical annuli. Three annular gaps and four ratios of annular height to annular gap are considered. The walls of the external and internal cylinders are isothermal with the temperature of the outer cylinder being higher and, thus, buoyancy is the driving force. The results show that the fluid motion increases as the aspect ratio and the annular gap become larger. The presence of the magnetic field results to fluid deceleration and, thus, to flow stabilization. Additionally, non symmetric flow patterns develop, due to the magnetic field, resulting in differently sized normal and parallel wall layers, namely the Hartmann and the Roberts layers, respectively. For all annular gaps considered, the highest spatially averaged heat transfer rates are obtained for aspect ratios equal to 1. |
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