Topic of Research Seminar: Computational Analysis of Flow and Thermal Characteristics Across Elongating Cylinders Immersed in Newtonian and Non-Newtonian Fluids
Abstract: Boundary layer flows occurring along flat or curved surfaces have been extensively studied in the past, since these are encountered in variety of technical applications. Moreover, fluids treated in most of the engineering applications are non-Newtonian and exhibit diverse physical characteristics such as managing heat transfer in metal extrusion process, glass manufacturing, polymer processing, coating applications to name a few. This thesis investigates momentum and thermal transport around stretching cylinders immersed in non-Newtonian fluids through various rheological models. Initially, viscoelastic effects are analyzed using the well-known second-grade and Jeffrey models. Then, the Reiner-Rivlin model is applied, capable of representing the flow behavior of diverse substances, including granular materials. The primary emphasis in these studies is on examining the heat transfer mechanisms influenced by frictional heating, a factor often overlooked in non-Newtonian flow situations. Also, a comparative analysis of how varying physical properties affect heat transfer in a Newtonian fluid-filled annulus between coaxial cylinders is investigated. This problem compares the two viscosity models which are widely adopted in the literature. This study enlightens the impact of gap size between the cylinders on subtle fluid dynamics variables. Preferred computational methods are the MATLAB built-in package bvp4c and Homotopy Analysis Method (HAM). The obtained results are subjected to discussions, analysis and physical interpretations to come up with significant conclusions.
Subject Field of Topic: Fluid Mechanics
Name of Speaker: Alhagie Cham
Professorial Rank of Speaker: PhD Student (Mathematics Dpt.), School of Natural Sciences, NUST
Email of Speaker: [email protected]
Date and Venue: (Wednesday) 02 October 2024, 15:30 hrs, at CR #202 (New SNS Building), School of Natural Sciences, NUST Islamabad