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Title: Thermophysical Characteristics of Shear Thinning Fluids: A Numerical Study
Authors: Khan, Imad
Keywords: Physical Sciences
Issue Date: 2020
Publisher: Quaid-i-Azam University, Islamabad.
Abstract: Many fluids used in industries are often non-Newtonian in nature. They have a non-linear relationship between stress and deformation rate. Recently much study has been done on nonNewtonian fluids due to their wide range uses in power engineering, petroleum production, industrial production mechanism, chemical processes including food and broad spectrum. Common examples of these fluids are molten polymers, biological fluids, lubricants, mud, shampoos, tomato sauce, pastes, paints, colloidal solutions and blood etc. These fluids have nonNewtonian properties which are important for the study of the flow behavior of such fluids, characterizing their physical properties and using these properties to predict flow behavior in process piping systems. Non-Newtonian fluids have been distributed into many subclasses according to their behavior and variations in their thermo-physical properties. This fact has been experimentally verified that every non-Newtonian fluid has quite different physical and mechanical properties. Hence a single constitutive equation is not capable to deliberate the important properties of all non-Newtonian fluids. So different constitutive equations were proposed to examine physical and mechanical properties of these fluids. Among these fluid models, one is known as Eyring-Powell fluid model which is proposed by Eyring and Powell. Eyring-Powell fluid is a shear thinning fluid also known as pseudoplastic fluid. In this dissertation, shear thinning fluid is considered with different physical effects i.e. flow over different geometries along with Newtonian heating, heat generation, Joule heating, thermal radiations, MHD, stratification effects and homogeneous-heterogeneous reactions. These fluid are used in contraction and expansion of surfaces such as stretching/shrinking wrapping bundle, aluminum bottle industrial procedure and wrapping hot roling, metal extrusion, continuous stretching of plastic films, glass-fiber and metal spinning etc. In fact, the stretching phenomenon with heat transfer has considerable importance in enhanced petroleum resources, paper production and food processing etc. In stretching phenomenon of fluid flow over a solid surface (i.e. interacts with surface) the viscous effects are more dominant in a region near the surface but has no significant effect outlying from the stretching surface. The governing mathematical form of this physical model are constructed through PDE’s. For solutions of these highly non-linear equations we use Shooting technique. Shooting technique is used only for first order differential equations. So first we convert the governing PDE’s to first order ODE’s and then solve through Matlab coding.
Gov't Doc #: 20190
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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