A LBM entropy calculation caused by hybrid nanofluid mixed convection under the effect of changing the kind of magnetic field and other active/passive methods

Abstract

The aim of this numerical study is to research the amount of effectiveness of the active methods (Exert of magnetic field as uniform/non-uniform and absorption/generation of heat uniformly) and passive methods (changing the direction of wall movement and mixing the nanoparticles in the pure fluid) on mixed convection. This research, which done based on the first and second laws of thermodynamics and via multi relaxation time lattice Boltzmann, determines the amount of heat transfer and entropy inside a trapezoidal cavity with two movable lids. According to the research findings: Enhancement of Re leads to reduce the impact of increasing HN in reducing the mean Nu. To achieve a stronger current (up to 53 %) and a higher value of the mean Nu (up to 19 %), it can benefit from changing KMF applied in terms of KMF1. If the power of MF increases, this impact can be exhibited more noticeably. Unlike production of heat mode, for CHAG < 0, enhancement of the percentage of nanoparticles leads to an augmentation of in the mean Nu, and this impact becomes stronger with an increase in HN, decrease in CHAG and decrease in Re. The greatest influence of increasing volume fraction in enhancement of the mean Nu occurs in situations where conduction overcomes convection. The maximum effect of this parameter can be exhibited for DWM4 in Re = 50. By increment of Re and CHAG, especially for DWM1, the share of MF in EP can be enhanced.