Please use this identifier to cite or link to this item: http://hdl.handle.net/11400/9890
Title: Magnetic field effect on the cooling of a low-Pr fluid in a vertical cylinder
Authors: Σαρρής, Ιωάννης Ε.
Ιατρίδης, Α.Ι.
Δριτσέλης, Χρήστος Δ.
Βλάχος, Νικόλας Σ.
Item type: Journal article
Keywords: numerical simulations;vertical magnetic field;Flow stratification;low-Prandtl number;Rayleigh number;αριθμός Rayleigh;χαμηλός Prandtl αριθμός;διαστρωμάτωση της ροής;κατακόρυφο μαγνητικό πεδίο;αριθμητικές προσομοιώσεις
Subjects: Technology
Engineering
Τεχνολογία
Μηχανική
Issue Date: 7-May-2015
2010
Date of availability: 7-May-2015
Publisher: American Institute of Physics
Abstract: Results of direct numerical simulations are presented for the transient and turbulentnatural convection cooling of an initially isothermal quiescent liquid metal placed in a vertical cylinder in the presence of a vertical magnetic field. The electrically conductive low-Prandtl number fluid is put to motion when the cylindrical wall is suddenly cooled to a uniform lower temperature. For this particular cooling process, the flow is characterized by three sequential almost discrete stages: (a) development of momentum and thermal boundary layers along the cylindrical cold wall, (b) intrusion of the cooled fluid into the main fluid body, and (c) flow and thermal stratification. The selected Rayleigh numbers in the present study are high enough so that turbulentconvection is established. The numerical results show that the magnetic field has no observable effect at the initial stage of the vertical boundary layer development and conduction heat transfer is favored during the intrusion stage. An interesting effect of the magnetic field during the stratification stage is the deceleration of the cooling process for low Rayleigh numbers and its acceleration for high ones. This dependence of the magnetic fieldeffect on the Rayleigh number was found to be related to the cold vortices emanating from the vertical boundary layer. In contrast with the hydrodynamic cooling, the magnetic field was also found to accelerate the cooling near the bottom of the cylinder.
Language: English
Citation: SARRIS, I.E., IATRIDIS, A.I., DRITSELIS, C.D. & VLACHOS, N.S. (2010). Magnetic field effect on the cooling of a low-Pr fluid in a vertical cylinder. Physics of Fluids. [Online] 22 (1). p.017101. Available from: http://scitation.aip.org/[Accessed 11/01/2010]
Journal: Physics of Fluids
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
URI: http://hdl.handle.net/11400/9890
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