Heat Transfer Characteristics of Nanofuid Flow around an Elliptical Cylinder

Abstract

This paper presents the results of extensive numerical simulations, based on the control volume method, of 2D nanofluid fluid flow around a heated elliptical cylinder with different incidence angle and aspect ratio. The continuity and momentum equations have been numerically solved using a SIMPLE algorithm. Two types of nanofluids consisting of Al 2 O 3 and CuO nanoparticles dispersed separately in base fluids of water and ethylene glycol mixture 60:40 (by mass), were selected to evaluate their effect on the flow over elliptical cylinder, also their superiority over conventional fluids. The thermo-physical parameters of nanofluid have been estimated using the theory of one fluid phase, a contemporary correlations of thermal conductivity and viscosity of nanofluids have been used in this paper, which are functions of particle volumetric concentration as well as temperature. The results of heat transfer characteristics of nanofluid flow over elliptical cylinder reveled clear improvement comparing with the base fluids. This enhancement is more important in flows with different geometry characteristics of the elliptical cylinder. While the aspect ratio and the incidence angle, exert significant influence on the heat transfer characteristics. The obtained results indicate that the use of aspect ratio 0.83 and incidence angle 79.2° lead to the highest amounts of heat transfer inside the tube.

Numerical analysis of conjugate natural and mixed convection heat transfer of nanofluids in a square cavity using the two-phase method

“…In the homogenous method, 100 it is assumed that the solid particles and the base fluid are in ther-101 mal equilibrium and have the same temperature and velocity. 102 There are many numerical studies in this field which have been 103 used homogeneous approach for simulation of the nanofluids 104 [14][15][16][17][18][19]. Purusothaman et al [20], Cho et al [21], Sheremet et al 105 [22], Alsabery et al [23] and Mahmoodi [24] presented a numerical 106 study of natural and mixed convection heat transfer of nanofluid 107 flow in different geometries.…”