NDLI: Effect of a Magnetic Field on the Heat Transfer Rate on Free Convection in a Rectangular Cavity

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gutierrez, Gustavo Medici, Ezequiel
Copyright Year	2005
Abstract	The interaction between magnetic fields and convection is an interesting phenomenon because of its many important engineering applications. Due to natural convection motion the electric conductive fluid in a magnetic field experiences a Lorenz force and its effect is usually to reduce the flow velocities. A magnetic field can be used to control the flow field and increase or reduce the heat transfer rate. In this paper, the effect of a magnetic field in a natural convection flow of an electrically conducting fluid in a rectangular cavity is studied numerically. The two side walls of the cavity are maintained at two different constant temperatures while the upper wall and the lower wall are completely insulated. The coupling of the Navier-Stokes equations with the Maxwell equations is discussed with the assumptions and main simplifications assumed in typical problems of magnetohydrodynamics. The nonlinear Lorenz force generates a rich variety of flow patterns depending on the values of the Grashof and Hartmann numbers. Numerical simulations are carried out for different Grashof and Hartmann numbers. The effect of the magnetic field on the Nusselt number is discussed as well as how convection can be suppressed for certain values of the Hartmann number under appropriate direction of the magnetic field.
Sponsorship	Heat Transfer Division
Starting Page	227
Ending Page	239
Page Count	13
File Format	PDF
ISBN	0791842215
DOI	10.1115/IMECE2005-82032
e-ISBN	0791837696
Volume Number	Heat Transfer, Part A
Conference Proceedings	ASME 2005 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2005-11-05
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Magnetohydrodynamics Temperature Navier-stokes equations Computer simulation Natural convection Flow (dynamics) Maxwell equations Convection Engineering systems and industry applications Cavities Fluids Magnetic fields Heat transfer
Content Type	Text
Resource Type	Article

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