Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity

The present work investigates numerically the natural convection within a square cavity under effects of inclined magnetic field with focus on heat transfer transition. The streamlines and the corresponding isotherms at various magnetic field intensities and angles are evaluated. The results disclos...

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Autores principales:	Chuan-Chieh Liao, Wen-Ken Li
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Heat transfer transition Magnetic field intensity Nusselt number Hartmann number Magnetic angle Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/f8317ff54f044a5c866ae09b9b299c29
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spelling	oai:doaj.org-article:f8317ff54f044a5c866ae09b9b299c292021-11-18T04:48:55ZAssessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity2214-157X10.1016/j.csite.2021.101638https://doaj.org/article/f8317ff54f044a5c866ae09b9b299c292021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2214157X21008017https://doaj.org/toc/2214-157XThe present work investigates numerically the natural convection within a square cavity under effects of inclined magnetic field with focus on heat transfer transition. The streamlines and the corresponding isotherms at various magnetic field intensities and angles are evaluated. The results disclose that enhancing the magnetic field intensity causes significant changes of streamlines and isotherms. Both the average Nusselt number (Numean) and maximum streamline function (Smax) decrease with magnetic field and exhibit sinusoidal oscillations with a period of 180°. In the condition of high Hartmann number (Ha), maximum velocity and Nusselt number appear at the left bottommost corner of the cavity subjected to magnetic angle of θ = 45◦, leading to the largest Smax and the best heat transfer performance. Owing to the interaction between the flow field and magnetic field, heat transfer patterns can be characterized by the variation of dimensionless Nusselt number Nu* over the angle of magnetic field, and named Pattern unimodal, Pattern peak-valley, Pattern transition, and Pattern bimodal. At various conditions of Ha and Rayleigh number (Ra), an empirical correlation is proposed to predict the heat transfer transition, which is useful in further understanding of the heat transfer mechanism within the square cavity.Chuan-Chieh LiaoWen-Ken LiElsevierarticleHeat transfer transitionMagnetic field intensityNusselt numberHartmann numberMagnetic angleEngineering (General). Civil engineering (General)TA1-2040ENCase Studies in Thermal Engineering, Vol 28, Iss , Pp 101638- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Heat transfer transition Magnetic field intensity Nusselt number Hartmann number Magnetic angle Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Heat transfer transition Magnetic field intensity Nusselt number Hartmann number Magnetic angle Engineering (General). Civil engineering (General) TA1-2040 Chuan-Chieh Liao Wen-Ken Li Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
description	The present work investigates numerically the natural convection within a square cavity under effects of inclined magnetic field with focus on heat transfer transition. The streamlines and the corresponding isotherms at various magnetic field intensities and angles are evaluated. The results disclose that enhancing the magnetic field intensity causes significant changes of streamlines and isotherms. Both the average Nusselt number (Numean) and maximum streamline function (Smax) decrease with magnetic field and exhibit sinusoidal oscillations with a period of 180°. In the condition of high Hartmann number (Ha), maximum velocity and Nusselt number appear at the left bottommost corner of the cavity subjected to magnetic angle of θ = 45◦, leading to the largest Smax and the best heat transfer performance. Owing to the interaction between the flow field and magnetic field, heat transfer patterns can be characterized by the variation of dimensionless Nusselt number Nu* over the angle of magnetic field, and named Pattern unimodal, Pattern peak-valley, Pattern transition, and Pattern bimodal. At various conditions of Ha and Rayleigh number (Ra), an empirical correlation is proposed to predict the heat transfer transition, which is useful in further understanding of the heat transfer mechanism within the square cavity.
format	article
author	Chuan-Chieh Liao Wen-Ken Li
author_facet	Chuan-Chieh Liao Wen-Ken Li
author_sort	Chuan-Chieh Liao
title	Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
title_short	Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
title_full	Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
title_fullStr	Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
title_full_unstemmed	Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
title_sort	assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/f8317ff54f044a5c866ae09b9b299c29
work_keys_str_mv	AT chuanchiehliao assessmentofthemagneticfieldinfluenceonheattransfertransitionofnaturalconvectionwithinasquarecavity AT wenkenli assessmentofthemagneticfieldinfluenceonheattransfertransitionofnaturalconvectionwithinasquarecavity
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Assessment of the magnetic field influence on heat transfer transition of natural convection within a square cavity

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