Magnetic field effect on the cooling of a low-Pr fluid in a vertical cylinder

dc.contributor.author	Σαρρής, Ιωάννης Ε.	el
dc.contributor.author	Ιατρίδης, Α.Ι.	el
dc.contributor.author	Δριτσέλης, Χρήστος Δ.	el
dc.contributor.author	Βλάχος, Νικόλας Σ.	el
dc.date.accessioned	2015-05-07T18:54:51Z
dc.date.available	2015-05-07T18:54:51Z
dc.date.issued	2015-05-07
dc.identifier.uri	http://hdl.handle.net/11400/9890
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://scitation.aip.org/	en
dc.subject	numerical simulations
dc.subject	vertical magnetic field
dc.subject	Flow stratification
dc.subject	low-Prandtl number
dc.subject	Rayleigh number
dc.subject	αριθμός Rayleigh
dc.subject	χαμηλός Prandtl αριθμός
dc.subject	διαστρωμάτωση της ροής
dc.subject	κατακόρυφο μαγνητικό πεδίο
dc.subject	αριθμητικές προσομοιώσεις
dc.title	Magnetic field effect on the cooling of a low-Pr fluid in a vertical cylinder	en
heal.type	journalArticle
heal.classification	Technology
heal.classification	Engineering
heal.classification	Τεχνολογία
heal.classification	Μηχανική
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://zbw.eu/stw/descriptor/19795-3
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Μηχανική
heal.identifier.secondary	doi:10.1063/1.3291074
heal.language	en
heal.access	free
heal.publicationDate	2010
heal.bibliographicCitation	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]	en
heal.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.	en
heal.publisher	American Institute of Physics	en
heal.journalName	Physics of Fluids	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true