Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Assessment of the Thermo-Hydraulic Performance of Flow in Concentric Annular Arrangement with the Inner Dimpled Tube.
Submission Author:
Gustavo Lousado Silva , SP , Brazil
Co-Authors:
Gustavo Lousado Silva, Andre Damiani Rocha, William Monte Verde
Presenter: Gustavo Lousado Silva
doi://10.26678/ABCM.COBEM2023.COB2023-1709
Abstract
Flows of fluids in non-circular ducts like annular pipes are common in engineering equipment such as chemical mixing devices, turbomachinery, and drilling operations in the oil and gas industry. In thermal applications, such as solar heaters, heat exchangers, and electrical submersible pumps, the most widely used component in many heat transfer devices is an annuli tube, which transports the fluid to either gain or dissipate heat. Several options are available for enhancing heat transfer associated with internal flows and may be achieved by increasing the convection coefficient and/or introducing surface roughness to enhance turbulence. Previous investigations have shown that dimpled surfaces can improve heat transfer rate with relatively low-pressure loss compared to other heat transfer augmentation techniques. This paper presents a thermal-hydraulic flow assessment in a concentric annular arrangement with an inner dimpled tube through a computational fluid dynamics approach for a laminar flow regime. The numerical analysis has been carried out for axial Reynolds numbers less than 2000. Laminar flow numbers are chosen to emphasize applications where the working fluid is viscous. The effects of Reynolds and Prandtl numbers, dimple depth, radius, and pitch on thermal-hydraulic performance were computed. The ultimate aim of this study is to provide some guidelines for potential applications of enhanced heat transfer by dimples for viscous flows. Different temperature distribution patterns were found on the dimpled wall, and the performance is significantly affected by the pitch and the Prandtl number.
Keywords
Computational fluid dynamics (CFD), Heat transfer, Thermo-Hydraulic
