, Fares REDOUANE 2
, Lakhdar RAHMANI 1
, Naveen Kumar GUPTA 3
, Mebarki BRAHIM 1
, Hitesh PANCHAL 4
, Saeed NAZARI 5
, Abhinav KUMAR 6
, Anand PATEL 7
2LGIDD, Department of physics, Faculty of Science and Technology, Relizane university, 48000, Relizane, Algeria 3Department of Mechanical Engineering, GLA University, Mathura, 281406, India
3Department of Mechanical Engineering, GLA University, Mathura, 281406, India
4Department of Mechanical Engineering, Government Engineering College Patan, Gujarat, 636011, India.
5Department of Mechanical Engineering, Ural Federal University, 620002, Russia
6Department of Medical Instruments Engineering Techniques, Al-farahidi University, Baghdad, 00965, Iraq
7Department of Mechanical Engineering, LDRP Institute of Engineering and Technology, Gandhinagar, Gujarat, 382016, India
Abstract
This research presents a numerical investigation of the flow field and heat transfer of a Visco-plastic fluid, The Bingham-Papanastasiou model is used to examine the flow field and forced convection heat transfer of a Viscoplastic fluid between two concentric cylinders with a wavy inner surface. By focusing on this particular configuration (wavy inner cylinder shape), where the inner surface exhibits as the hot wall while the outer surface is considered as the cold wall. This investigation is numerically achieved by using the Comsol Multiphysics, which is based on the finite‐volume method, employing Galerkin’s method for solving the governing equations. The parameters studied in this research are expressed with the following values: r/
R=1/3, Reynolds number (Re=1, 10, 50), and undulation number (nu=0, 6, 12, 24). Increasing the inertia parameter results in a higher intensity of thermal buoyancy, positively influencing heat transfer, particularly at Re=50. Furthermore, the acceleration of flow within the investi-gated space improves the hydrodynamic behavior, facilitating the exchange of thermal energy between the hot and cold walls. Additionally, it has been discovered that an undulating shape with a specific number of undulations (nu=6) maximizes hydrothermal performance within the investigated volume. The presence of these undulations enhances fluid mixing and dis-rupts the formation of stagnant regions ,which leading to improved heat transfer.
