Investigation of the nanofluids over a decelerated rotading disk with roughness

This study was prepared as a master's thesis at Bursa Technical University, Bursa Institute of Graduate Studies, Department of Mathematics. The thesis deals with flows related to nanofluids induced by a disk with a surface roughness that rotates deceleratingly. Nanofluids are special fluids, a product of nanotechnology, which have attracted much attention in engineering and fluid mechanics in recent years. These fluids are used in various industrial and medical applications and are an important research topic. In particular, the unsteady flow of nanofluids on a rotating disk and the frictional effects of this flow are studied. This study was conducted to understand the effects of nanofluids on fluid properties and to optimize these effects.For easy understanding of the subject, in the first part, definitions and terms related to the terms to be used in the future, equations to be used in the definition of the problem and numerical solution methods to be used in the solution are briefly mentioned. The MW partial slip model was used to model the surface roughness. This model allows a more detailed analysis of the interaction between the roughness structure of the surface and the fluid and plays an important role in predicting the fluid behavior. In the first part of the thesis, the definitions of the terms that will be used in the following, the equations and numerical solution methods that will be used to solve the problem are briefly introduced. Afterwards, a comprehensive literature review is made. In this review, emphasis is placed on the oldest and most emphasized version of the rotating disk problem. In the next section, the flow on a rotating disk is investigated, in particular the effects of the unsteady flow of nanofluids caused by a decelerating rotating disk. This study deals with the interaction between the base fluid water and of three different elements: Silver (Ag), Copper (Cu) and Copper Oxide (CuO). In the last chapter, the effects of the nanofluids on the characteristics of the fluid are detailed by examining their response to factors such as surface roughness, instability parameter and nanoparticle volume fraction. This part added originality to the thesis and made an important contribution to understanding the fluid properties.