NDLI: Natural Convection in a Tilted Rectangular Enclosure... 117 Natural Convection in a Tilted Rectangular Enclosure with a Single Discrete Heater

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Natural Convection in a Tilted Rectangular Enclosure... 117 Natural Convection in a Tilted Rectangular Enclosure with a Single Discrete Heater

Content Provider	CiteSeerX
Author	Al-Bahi, A. Al-Hazmy, M. Zaki, G. M.
Abstract	Abstract. The effect of inclination angle on the steady laminar free convection in a rectangular enclosure (aspect ratio = 5), which is discretely heated by an isoflux flush mounted small heater (L / H = 0.125) is studied numerically. The local and average Nusselt numbers are compared at inclination angles from 0 (bottom heating) to 180º (top heating), for modified Rayleigh numbers 102 ≤ Ra * ≤ 106. The two-dimensional mass, momentum and energy equations with Boussi-nesq approximation are solved for the present configuration where the sidewalls are adiabatic and the heat sink is isothermal. Forward time central space implicit finite difference scheme is employed to solve the coupled governing equations. Numerical results demonstrate the strong dependence of streamlines and isotherms on both inclination angle and Rayleigh number. Unlike fully heated enclosures the end effects of the discrete concentrated heat source enhances convection and increases the average Nusselt number as compared to that for thermally full active wall. The effect of the orientation angle on the flow structure and associated transition between unicellular and multi-ple cell flow is presented. The maximum Nusselt number is found close to the vertical orientation while the minimum is at the horizontal position with fluid heated from the top for which convection is effec-tual and the average Nusselt number is greater than unity.
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Subject Keyword	Full Active Wall Coupled Governing Equation Top Heating Strong Dependence End Effect Rayleigh Number Boussi-nesq Approximation Natural Convection Two-dimensional Mass Present Configuration Inclination Angle Bottom Heating Small Heater Orientation Angle Isoflux Flush Multi-ple Cell Flow Average Nusselt Number Rectangular Enclosure Steady Laminar Free Convection Heat Sink Horizontal Position Energy Equation Vertical Orientation Tilted Rectangular Enclosure Heat Source Single Discrete Heater Maximum Nusselt Number Flow Structure
Content Type	Text
Resource Type	Article

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