| Enhancement of heat transfer is relatively a new topic of research and its evaluation is needed to measure the performance of any enhanced technique. Lattice Boltzmann method is also a quite new numerical technique specifically the implementation of thermal models. In this research, thermal lattice Boltzmann method was utilized to simulate heat transfer enhancement in channels of two and three dimensions. Implementation of extended surfaces is a common practice for heat transfer enhancement from hot surfaces due to its significance in different fields of engineering application. The effect of varying the heat transfer surface's geometry and the dynamics of the flow play significant role on the enhancement process.;As expected the rate of heat transfer was enhanced by increasing the flow velocity. In addition, heat transfer was found to be highly augmented for extended surfaces' height close to the channel's mid-height. The in-between spacing affected the enhancement method as well, the closer the better for all values of Reynolds number within the tested range. Several correlations are proposed to describe the relationship between the rate of heat transfer and the investigated parameter in conjunction with the effect of flow velocity. In addition, the effect of changing the tips' shapes of the extended surfaces was found to enhance the heat transfer process.;For the three-dimensional flows, changing the transversal spacing was found to enhance the heat transfer rate better than what longitudinal spacing does.;In this work, the implementation of the extended surfaces as a method for heat transfer enhancement in channels is investigated. Several geometries are considered and the effect of several parameters on the flow characteristics and the heat transfer enhancement is investigated as well. The parameters of interest are the extended surfaces' height, thickness, in-between spacing, and the Reynolds number. In addition, the effect of changing the shapes of the extended surfaces tips' on the fluid flow characteristics and heat transfer is also investigated. Seven different geometries of the tips' shapes are presented for the investigation purposes. The performance of the enhancement method is evaluated through the Nusselt number, the pressure drop, and the minimization of entropy generation. |
