Effects of magnetic field on natural convective heat transfer of nanofluid flow in a two-dimensional rectangular cavity in the presence of constant-temperature triangular blades on the bottom wall

Abstract

The simulation of the natural convective heat transfer (HTR) of nanofluid (NFD) flow in a two-dimensional rectangular cavity is performed in this paper. A magnetic field (MFD) is placed close to the cavity and the NFD. The top wall of the cavity is cold, and the side walls are insulated. Three isothermal triangular blades are mounted on the bottom wall at the same temperature as the wall. By changing the height of one of these blades from 0.1 to 0.7 and changing the location of this blade, three HTR models are estimated. Lattice Boltzmann method (LBM) and an in-house code are used for the simulations. The findings show that including the MFD lowers the Nu. The Nu is reduced with the Ha. Enhancing the length of the blades intensifies the average Nu for three studied models so that an increment in the blade length from 0.1 to 0.7 enhances the Nu from 9.3% to 18.5%, respectively. For the blade length of 0.1 and 0.3, model 2 has the maximum Nu, while model 1 has the maximum Nu for the blade length of 0.5 and 0.7.