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mahmoodi, I., gharedagi, R., dostdar-, M. (2023). Numerical Study of the Mixed Convection in a Cavity with a Movable Cap and Baffle Containing Aluminum Oxide / Water Nanofluid. Electronic and Cyber Defense, 11(2), 139-154.
iman mahmoodi; reza gharedagi; mohammad mehdi- dostdar-. "Numerical Study of the Mixed Convection in a Cavity with a Movable Cap and Baffle Containing Aluminum Oxide / Water Nanofluid". Electronic and Cyber Defense, 11, 2, 2023, 139-154.
mahmoodi, I., gharedagi, R., dostdar-, M. (2023). 'Numerical Study of the Mixed Convection in a Cavity with a Movable Cap and Baffle Containing Aluminum Oxide / Water Nanofluid', Electronic and Cyber Defense, 11(2), pp. 139-154.
mahmoodi, I., gharedagi, R., dostdar-, M. Numerical Study of the Mixed Convection in a Cavity with a Movable Cap and Baffle Containing Aluminum Oxide / Water Nanofluid. Electronic and Cyber Defense, 2023; 11(2): 139-154.

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

مکانیک سیالات و آیرودینامیک
Volume 11, Issue 2 - Serial Number 30, March 2023, Pages 139-154    PDF (4.2 M)
Document Type: Original Article
Authors
iman mahmoodi1; reza gharedagi1; mohammad mehdi- dostdar-* 2
1Master's degree, Imam Hossein University, Tehran, Iran
2Professor, Imam Hossein University, Tehran, Iran
Receive Date: 20 November 2022,  Revise Date: 20 January 2023,  Accept Date: 29 January 2023 
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
Mixed Convection; Cavity; Movable Cap; Baffle; Nano Fluid; Numerical Investigation
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