Effect of Magnetic Field on Heat Transfer of Nanofluid with Variable Properties on the Inclined Enclosure

Document Type: Research Paper

Authors

1 Mechanical Engineering, University of Kashan, Kashan, Iran

2 Department of Mechanical Engineering, University of Kashan, Kashan, Iran

Abstract

The purpose of this study is to investigate the effect of magnetic field on the fluid flow and natural convection of CuO-water nanofluids with variable properties in an inclined square enclosure. The horizontal walls of cavity are insulated, the left sidewall assumed as hot wall and the right sidewall assumed as cold wall. Effects of Rayleigh numbers 103, 104, 105 and 106, Hartmann numbers 0, 10, 50, with horizontal angles of cavity, ,  and , and solid volume fraction of nanoparticles 0%, 2% and 4% are explored. Governing equations were solved numerically using finite volume and the SIMPLER algorithm. The result show that with applying magnetic field and increasing it, the velocity of nanofluids and thus the power of fluid decreases and behavior of nanofluids is more close to thermal conductivity than natural convection. At all ranges of studied Rayleigh numbers and volume fractions, with increasing the Hartmann number, the average Nusselt number decreases. Also with increasing cavity angle with the horizontal axis, the values of Nusselt number on the all ranges of Rayleigh numbers decreases.

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[1]   Abu-Nada, E., Masoud, Z., and Hijazi, A., “Natural Convection Heat Transfer Enhancement in Horizontal Concentric Annuli using Nanofluids”, International Communications in Heat and Mass Transfer, Vol. 35, No. 5, pp. 657–665, (2008).

[2]   Arefmanesh, A., Amini, M., Mahmoodi, M., and Najafi, M., “Buoyancy-driven Heat Transfer Analysis in Two-square Duct Annuli Filled with a Nanofluid”, European Journal of Mechanics B/Fluids, Vol. 33, pp. 95–104, (2012).

[3]   Sheikhzadeh, G.A., Arefmanesh, A., Kheirkhah, M.H., and Abdollahi, R., “Natural Convection of Cu–Water Nanofluid in a Cavity with Partially Active Side Walls”, European Journal of Mechanics B/Fluids, Vol. 30, No. 2, pp. 166–176, (2011).

[4]    Kandaswamy, P., Sundari, S.M., and Nithyadevi, N., “Magneto Convection in an Enclosure with Partially Active Vertical Walls”, International Journal Heat Mass Transfer; Vol. 51, pp. 1946–1954, (2008).

[5]    Pirmohammadi, M., and Ghassemi, M., “Effect of Magnetic Field on Convection Heat Transfer Inside a Tilted Square Enclosure”, International Communications Heat Mass Transfer; Vol. 36, pp. 776–780, (2009).

[6]    Mahmoudi, A., Pop, I., and Shahi, M., “Effect of Magnetic Field on Natural Convection in a Triangular Enclosure Filled with Nanofluid”, International Journal of Thermal Sciences, Vol. 59, pp. 126–140, (2012).

[7]    Ashorynejad, H., Mohamadb, A .A., and Sheikholeslami, M. ,“Magnetic Field Effects on Natural Convection Flow of a Nanofluid in a Horizontal Cylindrical Annulus using Lattice Boltzmann Method”, International Journal of Thermal Sciences, Vol. 64, pp. 240–250, (2013).

[8]    Hwang, Y., Lee, J.K., Jung, Y.M., Cheong, S.I., Lee, C.G., Ku, B.C., and Jang, S.P, “ Stability and Thermal Conductivity Characteristics of Nanofluids”, Thermochimica Acta, Vol. 455, No. 1–2, pp. 70–74, (2007). April

[9]    Brinkman, H.C., “The Viscosity of Concentrated Suspensions and Solution”, the Journal of Chemical Physics, Vol. 20, pp. 571–581, (1952).

[10]    Maxwell-Garnett, J.C., “Colors in Metal Glasses and in Metallic Films, Philos”, Trans. Roy. Soc. A, Vol. 203, pp. 385-420, (1904).

[11]    Koo, J., Kleinstreuer, C., “A New Thermal Conductivity Model for Nanofluids”, Journal of Nanoparticle Research, Vol. 6, pp. 577–588, (2004).