The aim of this present work is coming to investigate the problem of the heat transfer enhancement over a double constricted channel. A double multi-relaxation-time lattice Boltzmann method (LBM-DMRT) is suggested to simulate numerically two-dimensional incompressible laminar flow and heat transfer. The flow and the temperature fields are treated using MRT-D2Q9 and MRT-D2Q5 models, respectively. This kind of problem is related to wide range of applications in different fields of engineering, such as the heat transfer enhancement and heat exchangers.....

The physical configuration of the present problem consists of two dimensional incompressible, viscous, laminar water flow (Pr = 6) in double constricted channel where the height and the length are defined by H and L, respectively. For the constricted part, it characterized by the constricted ratio 2h/L in which h and l are respectively, the height and the width for each block, and the distance between the first and the second constriction is w. The temperature of the bottom and the top channel walls are kept to Tw=350K, and the temperature of the incoming fluid takes the value Tin=300K. In the inlet, the velocity Uin and the temperature Tin profile is considered uniform. At the outlet, the gradients of the velocity and temperature are set to zero. Numerical simulations have been realized to understand the effects of several parameters such as the Reynolds number Re, the height l and the distance w between the constriction parts of each block.