Effects of the nanoparticle shape on natural convection heat transfer in a square enclosure filled with Cu-H2O nanofluid
Abstract
Heat is transferred by natural or forced convection in devices such as heat exchangers, which are frequently used in heating-cooling processes. One of the ways to passively increase heat transfer is to use nanofluid as the working fluid. In this study, natural convection heat transfer in a square enclosure having a hot vertical wall and a cold vertical wall was investigated numerically. The horizontal walls of the enclosure are perfectly insulated. The effects of the nanoparticle shape on natural convection heat transfer in a square enclosure filled with Newtonian Cu-H2O nanofluid were investigated. In this study, different volume fractions of the spherical, cylindrical, and blade-shaped nanoparticles were examined. The numerical study was carried out in the range of Rayleigh number 104-106 and the nanoparticle volume fractions were taken as 0%, 2%, and 4%, respectively. The non-dimensional equations of the continuum, momentum, and energy are discretized by the SIMPLE (Semi Implicit Pressure Linked Equations) algorithm and solved by the finite volume method (FVM) in a Fortran code. As a result of the study, it was noted that nanoparticle volume fraction, Rayleigh number, as well as nanoparticle shape, increased heat transfer up to 19% compared to the base fluid.
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URN: https://sloi.org/urn:sl:tjoee82291
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