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Numerical simulation of Al2O3–water nanofluid mixed convection in an inclined annulus | ||
| Energy Equipment and Systems | ||
| مقاله 3، دوره 3، شماره 2، آذر 2015، صفحه 97-111 اصل مقاله (1.55 M) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/ees.2015.56034 | ||
| نویسندگان | ||
| Hadi Imani1؛ Ali Cheraqi2؛ Ali Jafarian1؛ Mohammad Mahdi Heyhat1 | ||
| 1Faculty of Mechanical Engineering, Tarbiat Modares University, Iran P.O. Box 14115-143 Tehran, Iran | ||
| 2Faculty of Aerospace Engineering, KNTU, P .O. Box 16765-3381 Tehran, Iran | ||
| چکیده | ||
| Laminar mixed convection of Aluminium oxide (Al2O3)–water nanofluid flow in an inclined annulus using a single-phase approach was numerically studied. Constant heat flux boundary conditions were applied on the inner and outer walls. All the thermophysical properties of nanofluid, such as, viscosity, heat capacity, thermal conductivity, and thermal expansion coefficient, except density in the body force term were assumed to be constant. Based on Boussinesq’s hypothesis, density was assumed to be a linear function of temperature. The nanofluid properties were calculated in terms of constant properties of nanoparticles and the base fluid. Using the finite volume method the continuity, momentum, and energy equations were numerically solved. Numerical simulations were conducted for the nanoparticle concentrations of 0, 2, and 5% and five different inclination angles including -30o, -15o ,0 , +15o, and+30o. Results showed that a variation in the inclination angle affected the Nusselt number on the inner wall more than the outer one. The Nusselt number in negative angles was higher than in the positive ones, so that at a volume fraction of 5%, the average Nusselt number at the inner wall decreased almost 2% when changing the angle from -30o to+30o. The local Friction factor in the positive angles was higher than in the negative ones. | ||
| کلیدواژهها | ||
| Inclined Annulus؛ laminar؛ Mixed Convection؛ Nanofluid | ||
| مراجع | ||
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