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Title: Heat and Mass Transfer Analysis During the 3D Non-newtonian Magnetohydrodynamics Fluid Flow
Authors: Khan, Shahid
Keywords: Physical Sciences
Issue Date: 2022
Publisher: Kohat University of Science and Technology, Kohat
Abstract: Non-Newtonian fluids are the ones whose viscosity change in time course. Understanding the dynamics of such fluid past through different geometries yield an insight about complex problems which are ubiquitous in nature. From an array of approaches to tackle such problems, this thesis used a semi-analytical approach called as Homotopy analysis method (HAM) for the non-Newtonian fluid models by considering different physical geometries. Along the lines of our exploration, important physical parameters are identified and its impact on fluid properties is discussed. For the main chapters, mathematical models presented are PDE (partial differential equations) system of equations which are then reduced to ODE (ordinary differential equations) models using similarity transformation, thereby, reducing the system complexity. Reduced models are then solved using HAM and qualitative information is obtained with the help of graphs and tables. Chapter 1 provides some background knowledge about fluids, different constitutive equations and conservation equations. Special types of fluid such as Ferrofluid, magne tohydrodynamic (MHD) fluid and various impacts like Hall effect are briefly described. Some basic models for the non-Newtonian fluid are also presented. For analytic treatment, background knowledge about HAM is provided. Relevant work and results on Non-Newtonian fluids from the literature are discussed in Chapter 2. In Chapter 3, we used HAM to explore the dynamics of mathematical model for the three dimensional magnetized Carreau fluid past a perforated surface by considering the convective heat and mass transfer. Various physical parameters of interest (We, M, m,Rd, Pr, Sc, Du, Sc, n) are identified. By changing these physical parameters, effect on the velocity gradient of the fluid is explored. For validation of the results, the current x study is compared with the available results in literature. Chapter 4 is mainly concerned with the heat transfer analysis of the Casson fluid flow past a yawed cylindrical geometry. A brief discussion of impact of various physical parameters on velocity gradient is presented. Chapter 5 sheds light on the non-Newtonian fluid over a paraboloid of revolution with heat and mass transfer analysis. The results are presented in the form of graphs and tables for various state variables and engineering quantities of interest. Concluding thoughts about the main results and future work are presented in Chapter 6.
Gov't Doc #: 25513
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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