A numerical analysis is carried out in a lid-driven cavity using silver (Ag)-water nano-fluid by keeping different shape of conducting as well as insulating cylinders at the centre. The cavity is heated isothermally by a heater placed at the bottom. The right and the left walls are in insulated condition and the upper cold wall is moving with some constant speed. The thermal performance of the nanofluid with the cylinder is being analyzed at two Richardson number (Ri=0.01, 10), four percentage volume of Ag nanoparticles (0 %, 2 %, 5 %, 8 %), and a constant value of Grashof and Prandtl number as 10 4 and 6.2 respectively. The two-dimensional, incompressible and steady Navier-Stokes equations are solved using the commercially available Finite-volume based software Fluent. It is analysed that the thermal mixing inside the enclosure is highly dependent on the shape of a solid cylinder. Moreover, the insignificant variation in flow and thermal field is observed with change in the thermal boundary conditions (insulation and conduction) of centrally placed solid cylinder for all the range of Richardson number (Ri). With increase in percentage volume of nanoparticle Nusselt number (Nu) increases whereas Ri has reverse effect on Nu.
A numerical study of mixed convection in a square enclosure from a heating element to a cold moving wall is performed under the isothermal heating conditions. The heater is placed at the bottom boundary and the cold upper wall moves horizontally towards right side with constant velocity. The lateral walls are insulated. The study includes the thermal performance of nanofluid for various shaped obstacles kept at center of the enclosure. The application of hydro-magnetism with uniform and constant magnetic intensity throughout the bottom wall is considered. The heat convection is studied at two Richardson number (0.01 and 10), four percentage volume of silver nanoparticles (0%, 2%, 5%, and 8%) and four Hartmann number (0, 10, 20, and 50). Grashof number, Prandtl number, and Reynolds number have a constant value of 104, 6.2 and 100 respectively. The obtained results indicate the suppression of heat fluxes with increasing intensity of magnetic field whereas it increases with increasing Richardson number and percentage volume of the nano-material in the base fluid.
A computational study of laminar and steady heat transfer is carried out with copper (Cu)-water nanofluid inside a lid driven cavity. Different conducting obstacles are placed at the optimum position for which the maximum thermal transport occurs. The thermal performance of the Cu-H2O nanofluid is found out at this optimum position with three different cylinder geometries (square, rectangular and circular), two Richardson numbers (0.01 and 1), and three volume concentrations of copper nanoparticles (0 %, 3 % and 5 %) in water. The Prandtl and Grashof numbers are considered as 6.2 and 10 4 , respectively. The fluid is heated by placing a differential heater at the left wall. All the walls except the upper one are in a stationary condition. The top moving wall, stationary bottom wall and the remaining portion of the left wall, where there is no heater, are made insulated. The rectangular cylinder is placed at two different orientations (vertical and horizontal). The results show that the shape of the cylinder contributes to a compelling role in efficient heat transfer. For both Richardson numbers, the Nusselt number is maximum with the case where the square-shaped cylinder is placed at the top left corner. The Nusselt number increases with an increase in the percentage volume of nanoparticles and reduces with an increase in the Richardson number.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.