Entropy Generation in MHD Natural Convection Within Curved Enclosure Filled with Cu-Water Nanofluid

摘要

An analysis of natural convection flow in a differentially heated enclosure having a sinusoidal upper wall filled with Cu-water nanofluid under the influence of constant vertical magnetic field has been performed numerically. The results are analyzed for various combinations of Rayleigh number (10~2 ≤ Ra ≤ 10~4), amplitude of the sinusoidal wall (0 ≤ a ≤ 0.4), volume fraction of nanoparticles (0.0 ≤ φ ≤ 0.2) and Hartmann number (0 ≤ Ha ≤ 50). Numerical simulations have been presented in the form of streamlines (ψ), isotherms (θ), entropy generation due to heat transfer (S_θ), fluid friction (S_ψ), magnetic field (S_m) and average Nusselt number (Nu_(avg)). It has been observed that the presence of magnetic field and nanofluid strongly affects the flow behaviour and heat transfer rate inside the enclosure. Heat transfer rate rises with surge in Rayleigh number and attenuates with increase in amplitude of the wavy wall.