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Title: Transient laminar MHD natural convection cooling in a vertical cylinder
Authors: Ιατρίδης, Α.Ι.
Δριτσέλης, Χρήστος Δ.
Σαρρής, Ιωάννης Ε.
Βλάχος, Νικόλας Σ.
Item type: Journal article
Keywords: electrically conducting fluid;axial magnetic field;cylindrical wall;Prandtl numbers;Rayleigh number;ηλεκτρικά αγώγιμο ρευστό;αξονικό μαγνητικό πεδίο;κυλινδρικό τοίχωμα;αριθμοί Prandtl;αριθμός Rayleigh
Subjects: Technology
Issue Date: 7-May-2015
Date of availability: 7-May-2015
Publisher: Taylor & Francis
Abstract: A numerical study is presented of transient laminar natural convection cooling of an electrically conductive fluid, placed in a vertical cylinder in the presence of an axial magnetic field. The cylindrical wall is suddenly cooled to a uniform temperature, thus setting the fluid to motion. The cooling process starts with the development of momentum and thermal boundary layers along the cylindrical cold wall, followed by the intrusion of the cooled fluid into the bulk, and finally, by fluid stratification. A range of Hartmann, Rayleigh, and Prandtl numbers are studied for which the flow remains laminar in all stages. It is found that the increase of the magnetic field reduces the heat transfer rate and decelerates the cooling process. This can be attributed to the damping of the fluid motion by the magnetic field, which results in the domination of conduction over convection heat transfer. The increase of the Rayleigh number enhances heat transfer, but the cooling process lasts longer due to the higher temperature of the hot fluid. The flow deceleration and the reduction of heat transfer are less intense for fluids with low Prandtl number.
Language: English
Citation: IATRIDIS, A.I., DRITSELIS, C.D., SARRIS, I.E. & VLACHOS, N.S. (2012). Transient laminar MHD natural convection cooling in a vertical cylinder. Numerical Heat Transfer: Part A - Applications. [Online] 62 (7). p.531-546. Available from:[Accessed 27/09/2012]
Journal: Numerical Heat Transfer, Part A: Applications
Type of Journal: With a review process (peer review)
Access scheme: Publicly accessible
License: Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες
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