Numerical Study of the Mixed Convection in a Cavity with a Movable Cap and Baffle Containing Aluminum Oxide / Water Nanofluid

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Technical and Engineering Faculty and Research Institute, Imam Hossein University, Tehran, Iran

2 science committee of Technical Engineering Faculty of Imam Hossein University

Abstract

In this study, due to the importance of investigating the improvement of heat transfer during the movement of al2o3/water Nano fluid, mixed convection inside a square cavity with a movable cap and baffle was simulated numerically using the finite volume method. The under-study cavity is two dimensional and affecting by gravity and rotating perpendicular to the plane. Right and left walls of the cavity are adiabatic and the upper wall is warm source at a constant temperature. Lower surface is a movable cap that moves from the center to both sides and assumed to be a cold source at constant temperature. The baffle was assumed to be at the same temperature as cold wall and had a height equal to two thirds of the side of the cavity. Experimental data was used for the thermal conductivity coefficient of the Nano fluid. Simulations were performed at a constant Reynolds number to investigate the effects of three parameters of Richardson number, volume fraction of solid particles and cavity slope angle on isothermal lines, streamlines and mean Nusselt value, which created 36 different states. It was found that increasing of slop angle of cavity with respect to reference surface (0 to 90 deg), increasing Richardson number (0.01 to 100) and increasing the volume fraction (0 to 0.05), increase the mean Nusselt value, where the maximum value of which is equivalent to state ,  , . Increasing the volume fraction of the Nano fluid causes an increment in average Nusselt number. It was also observed that at low Richardson values, cavity slope angle has no effect on the results

Keywords

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References

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History

  • Receive Date: 21 October 2022
  • Revise Date: 25 January 2023
  • Accept Date: 29 January 2023
  • Publish Date: 02 March 2023

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