Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC44: Jets: Control, Impinging and Swirling
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 208AB
Chair: Xiaofeng Liu, San Diego State University
Abstract: ZC44.00006 : Analysis of Turbulent flow Structures and Heat Transfer with Combined Periodic Oscillation and Swinging Motion of Turbulent Slot Jets*
1:55 PM–2:08 PM
Presenter:
Prasanth Anand Kumar Lam
(National Institute of Technology Warangal)
Authors:
Dayanand Kumar
(National Institute of Technology Warangal)
Prasanth Anand Kumar Lam
(National Institute of Technology Warangal)
Collaboration:
NA
The purpose of this study is to investigate the effect of combined periodic oscillation and swinging motion of turbulent jet impinging onto an isothermal surface. For this purpose, the governing equations for continuity, momentum, and energy were solved in the Cartesian framework. The RANS-based two-equation SST k-Omega turbulence model was employed and the algorithm was validated against the case of a turbulent slot jet impinging on an isothermal surface at Re = 20000 for the different jet-to-impingement surface spacing (H/B = 4.0 and 9.2). Further, numerical simulations were performed for different geometric and flow variables viz. Reynolds number [Re = 6000 - 7200], jet-to-impingement surface distance [H = 4.0 and 9.2], and frequencies of periodic oscillation and swinging motion. As the swinging jet oscillates over the isothermal surface, the shear layer between the jet and ambient fluid is observed to oscillate leading to the formation of a vortex street. Also, periodic disruption to the boundary layer was observed instead of a stagnant boundary layer, which may eventually lead to an improved heat transfer. Further, the simulated results comprising fluid flow pattern, temperature distribution, pressure drop, and local and surface averaged Nusselt number along the impingement surface are presented and discussed. The enhancement of surface averaged Nusselt number along the isothermal surface and pressure drop with increasing Reynolds number and reducing jet-to-impingement surface distance are quantified in detail.
*NA
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