Browsing by Author "Baby Naznin"

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    Natural convective heat transfer of nanofluid inside a prismatic enclosure under the influence of inclined magnetic field
    (Department of Mathematics, BUET, 2024-11-24) Baby Naznin; Parveen, Dr. Nazma
    In this thesis, the fundamental concepts of nanofluids and literature reviews have been discussed, and two-dimensional natural convection flow and heat transfer inside the prismatic enclosure charged by nanofluid with the presence of the inclined magnetic field has been investigated numerically. Copper- ethylene glycol nanofluid has been taken as default nanofluid. The top two walls are cold Tc while the bottom wall is heated Th (Tc < Th). Moreover, thermal boundary condition are employed along the bottom diameter. The non-linear governing equations with boundary conditions have been transformed into dimensionless forms using a set of non-dimensional variables. The highly powerful partial differential equations solver finite element technique (FEM) of Galerkin weighted residual type has been employed for the numerical simulations in the present problem. The outcomes illustrate an excellent agreement with previously published research. The different physical model parameters such as Hartmann number, Rayleigh number, Volume fraction of nanoparticle and different angles have been investigated using streamline contours, isothermal lines, and heat transfer in terms of average Nusselt number and an inclined magnetic field are applied at an angle (α) with horizontal direction. The implications of the Rayleigh number (103 ≤ Ra ≤ 106), Prandtl number of base fluid, Ethylene Glycol (210.5), Hartmann number (0 ≤ Ha ≤ 50), and the magnetic field inclination angle (0 ≤ α ≤ 2/3π) are visualized by the streamlines, isotherms and the heatlines. The outcomes the present study may be a useful guide for experiments and research on natural convection flow of nanofluid in a prismatic enclosure to control the flow and heat transfer. The mentioned parameters have significant effects on flow and heat transfer. Moreover, inclined magnetic field play a key role on flow field. The results indicate that the mentioned parameters strongly affect the flow phenomenon and temperature field inside the cavity. By suitable combination of parameters heat transfer can be maximized. Comparisons with previously published work are performed and the results are found to be in excellent agreement.