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Pressure-Induced Instability Characteristics of a Transient Flow and Energy Distribution through a Loosely Bent Square Duct

Sreedham Chandra Adhikari1, Ratan Kumar Chanda1, Sidhartha Bhowmick1, Rabindra Nath Mondal1, Suvash Chandra Saha2,*

1 Department of Mathematics, Jagannath University, Dhaka, 1100, Bangladesh
2 School of Mechanical and Mechatronic Engineering, University of Technology Sydney, New South Wales, Australia

* Corresponding Author: Suvash Chandra Saha. Email: email

Energy Engineering 2022, 119(1), 429-451. https://doi.org/10.32604/EE.2022.018145

Abstract

Due to widespread applications of the bent ducts in engineering fields such as in chemical, mechanical, bio-mechanical and bio-medical engineering, scientists have paid considerable attention to invent new characteristics of fluid flow in a bent duct (BD). In the ongoing study, a spectral-based numerical technique is applied to explore flow characteristics and energy distribution through a loosely bent square duct (BSD) of small curvature. Flow is accelerated due to combined action of the non-dimensional parameters; the Grashof number Gr (=1000), the curvature (=0.001), and the Prandtl number Pr (=7.0) over a wide domain of the Dean number . Fortran code is developed for the numerical computations and Tecplot software with Gost Script and Gost View is used for the post-processing purpose. The numerical study investigates steady solutions (SS) and as a result, a structure of six-branches of SSs composed of 2- to 6-vortex solutions is obtained. Then oscillating behavior with flow transition is discussed by obtaining time-dependent solutions followed by power-spectrum analysis. Results show that the trend of unsteady flow (UF) undergoes in the sequence ‘steady-statemulti-periodicsteady-statechaoticmulti-periodicchaotic’, if Dn is increased. Asymmetric 2- to 4-vortex solutions are obtained for UF. Convective heat transfer (CHT) is then examined obtaining temperature gradients and energy contours, and it is found that CHT is significantly enhanced by the secondary flow (SF). The present study reveals that the role of secondary vortices over heat transfer (HT) is highly significant and HT occurs substantially for the chaotic solutions. Finally, for the interest of validation, the present numerical result is compared with the previously published experimental outcomes, and a good agreement is remarked.

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APA Style
Adhikari, S.C., Chanda, R.K., Bhowmick, S., Mondal, R.N., Saha, S.C. (2022). Pressure-induced instability characteristics of a transient flow and energy distribution through a loosely bent square duct. Energy Engineering, 119(1), 429-451. https://doi.org/10.32604/EE.2022.018145
Vancouver Style
Adhikari SC, Chanda RK, Bhowmick S, Mondal RN, Saha SC. Pressure-induced instability characteristics of a transient flow and energy distribution through a loosely bent square duct. Energ Eng. 2022;119(1):429-451 https://doi.org/10.32604/EE.2022.018145
IEEE Style
S.C. Adhikari, R.K. Chanda, S. Bhowmick, R.N. Mondal, and S.C. Saha "Pressure-Induced Instability Characteristics of a Transient Flow and Energy Distribution through a Loosely Bent Square Duct," Energ. Eng., vol. 119, no. 1, pp. 429-451. 2022. https://doi.org/10.32604/EE.2022.018145



cc This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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