The effect of magnetic field on heat transfer coefficient in the inlet pipe for laminar flow

سال انتشار: 1391
محل انتشار: دومین همایش ملی نفت ،گاز و پتروشیمی
کد COI اختصاصی: NCOGP02_002
زبان مقاله: انگلیسی
تعداد مشاهده: 1196

نویسندگان

Department of Chemistry, Islamic Azad University, Omidiyeh Branch, Omidiyeh, Iran

Department of Chemical Engineering, Islamic Azad University, Gachsaran Branch, Gachsaran, Iran

چکیده

The influence of a transverse magnetic field on the local heat transfer of an electrically-conducting laminar fluid flow with high Prandtl number through a pipe was studied experimentally. Experiments indicated an increase in the local Nusselt number. The coupled set of the equations of motion and the energy equation including the viscous and Joule dissipation terms becomes non-linear and is solved numerically using a finite difference scheme. Favorable comparisons with experimental results confirm the correctness of the numerical results. It is found that the influence of magnetic field can be diminished by reducing the angle between the flow direction and the direction of magnetic field. The wall temperature reduces as the value of Hartmann number increases and the reduction rate of the wall temperature decreases as the value of Hartmann number exceeds a certain value. The average Nusselt number asymptotically approaches its limit as the Hartmann number becomes larger. Also, curve fitting can be employed to derive an equation for the average Nusselt number as a function of the Hartmann number. This equation is similar to the Sieder-Tate equation. It is observed that increasing the Hartmann number has no considerable effect on the thermal boundary layer thickness but decreases the temperature of fluid layers inside the boundary layer.

کلیدواژه ها

Convection; Heat transfer; Laminar flow; Magneto-hydrodynamics (MHD

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