The dissertation of Mohammad Nemati, a PhD graduate in Mechanical Engineering - Energy Conversion from the Department of Mechanical Engineering at Yazd University, was selected as the best dissertation of 1402 by the Iranian Society of Mechanical Engineers.
The dissertation, titled "Assessment of Entropy Production Due to Natural Convection and Thermal Radiation of Non-Newtonian Fluid in the Presence of Heat Absorption/Generation and Magnetic Field by Lattice Boltzmann Method" presents a novel approach to analyzing heat transfer and entropy generation in complex fluid flows.
The dissertation was recognized for its innovative methodology and significant contributions to the field of heat transfer and fluid mechanics. The research findings have the potential to advance the understanding of heat transfer processes in non-Newtonian fluids and their applications in various engineering fields.
Dr. Mohammad Sefid, a faculty member of the Department of Mechanical Engineering at Yazd University, was commended for his role as the supervisor of this outstanding dissertation.
The abstract of the mentioned dissertation is as follows: "Reducing the temperature of electronic components enclosed in an unwanted space or reducing the temperature of heat-generating walls has always been an important challenge in engineering industries. In this regard, the presence of various factors such as thermal radiation, magnetic field and heat absorption/production affects the amount of heat removal from an object that needs to be cooled. Investigation of the flow behavior of electrically conductive fluids and studying the amount of heat transfer and entropy produced due to them is another very important issue. Considering the importance of these issues, determining the thermal performance index under the effect of internal and external factors influencing the natural convection flow using the lattice Boltzmann method has been the target of this research. The two-dimensional chamber containing a non-Newtonian nanofluid with a power model in which the phenomenon of natural convection occurs is subjected to uniform heat absorption/production and uniform and non-uniform magnetic fields at different angles. The feature of the present work is to investigate the effect of thermal radiation and the shape of the cold wall of the chamber in three forms: flat, curved, and diagonal on the flow characteristics. Application in the design of electronic coolers and solar collectors is one of the practical cases of this research. Acceptable agreement of the obtained results with previous related studies confirmed the validity of the presented results. Based on the acquired results, the presence of radiation parameters leads to the improvement of heat transfer, which effect is more evident due to the enhancement of the fluid power-law index. In addition to reducing the Nusselt number for enhancing the fluid power-law index, the effectiveness of the magnetic field in reducing the entropy value and heat transfer rate enhances the fluid power-law index reduction. It is possible to achieve a higher current strength and the Nusselt number up to 40% and 61%, respectively, by applying a vertical and non-uniform magnetic field. Although for heat production, there will be the lowest value of thermal performance index and the Nusselt number, but the greatest influence of the magnetic field is observed in the heat production mode. By designing the wall in a flat shape, in addition to increasing the thermal performance index, it is also possible to reduce the Bejan number."