مرکز منطقه ای اطلاع رساني علوم و فناوري - Laminar Natural Convection Heat Transfer of Water-Based Nanofluids in Square Enclosure Containing Heater

Abstract :

In this study, a square enclosure is analyzed while one of the vertical side is cooling and the left vertical side is heating. The top and the bottom sides are isolated. The inside of the enclosure is filled with a single-phase, water-based nanofluid. Cu, Al2O3 and TiO2 are selected as of nanoparticles. The volume fraction of solid particles is in the range 0.0 ≤ Φ ≤ 0.2 . Steady laminar natural convection heat transfer in the enclosure, while changing the type and the volume fraction of nanoparticle and the position of heater on the left vertical side, is investigated numerically. The effect of using two discrete heaters on the heat transfer and flow circulation is investigated. The total heat strength of the discrete heaters, which are the only source of heat to the system, is kept constant. The heater and cold side are isothermal. The governing equations; continuity equation, Navier-Stokes equations and the energy equation along with Boussinesq approximation are solved using the Fluent®software. The SIMPLE algorithm and second order upwind scheme was used in the discretization of transport terms. Rayleigh number is chosen as 10^3 − 5 × 10^8 and as a measure of the steady state convection heat transfer, the average Nusselt number over the cold surface is calculated. In this parametric study, the position of heater, the type of water-based nanofluid and the volume fraction of solid particles are changed and parametric analyses are conducted. As a result, obtained numerical values and the contours of temperature and stream function for cooling of heaters are given.