Numerical investigation on the heat transfer enhancement using a confined slot impinging jet with nanofluid
Ibrahim K. Alabdaly, M.A. Ahmed *
Department of Mechanical Engineering, College of Engineering, University of Anbar, Ramadi, Anbar, Iraq
Abstract: In this article, laminar convective heat transfer of a confined slot impinging jet with nanofluid has been numerically investigated over Reynolds number ranges of 200-1000. Two circular ribs are mounted on the lower-target surface: one rib located right the stagnation point and another one located on the left of the stagnation point. SiO2-water nanofluid with nanoparticles volume fraction ranging from 0 to 4% and nanoparticles diameters of 30 nm has been examined. The two-dimensional governing continuity, momentum and energy equations have been solved using finite volume method based on SIMPLE algorithm. The effect of Reynolds number, nanoparticles volume fraction, rib height and rib location on the flow and thermal characteristics are presented and discussed. Results showed that the average Nusselt number, performance factor, total entropy generation as well as friction factor increase with increasing nanoparticles volume fraction. In addition, it is found that the best thermal-hydraulic performance factor is around 1.89 which is obtained at Reynolds number of 1000, nanoparticles volume fraction of 4%, the rib height of 0.1 and the rib location of 2.
Keywords: Jet impingement; Nanofluid; Entropy generation; Thermal-hydraulic performance; Finite volume method