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MHD Natural Convection Heat Transfer in a Nanofluid Filled Finned Square Cavity

K. S. Arjun & K. Rakesh
Source: K. S. Arjun & K. Rakesh, "MHD Natural Convection Heat Transfer in a Nanofluid Filled Finned Square Cavity,” Journal of Mechanical Engineering Research and Developments, vol. 40, no. 3, pp. 481-489, 2017. 
 
Document Type: Research Article

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Abstract: Steady laminar natural convection enhanced in differentially heated square cavity of aspect ratio 3 with 3 horizontal conducting thin fins attached to its hot wall and adiabatic horizontal walls under Ha = 10. 6% Cu-water nanofluid with non-uniform nanoparticles (R = 0.007) at 50 nm average diameter at 333.15K with fin length 0.5 and fin position 0.4 at Ra 10^6 enhances average Nu to the maximum in cold wall. Heat transfer can be enhanced by increasing ratio of minimum to maximum nanoparticle diameter, aspect ratio, at magnetic field strength Ha = 10, Ra up to 10^6 , fin number up to 15 at Ra = 10 3 and fin number up to 6 from Ra = 10^5 to 10^8 and fins length from 0.25 to 0.5. But heat transfer decreases by increasing Ha after 10, at Ra 10^8 and by increasing fin number from 9 to 15 from Ra 10^5 to 10^8 . Increase of nanofluid temperature is found to augment the effects of ratio of minimum to maximum nanoparticle diameter. Increase of nanofluid solid volume fractions found to augment the effects of magnetic field strength and Ra. Higher Ra augment the effect of aspect ratio, fin number, fin length and fin position.

Keywords: Magneto Hydro Dynamics; Natural convection; Fin; Heat transfer; Nanofluid; Square cavity.