Numerical Investigation of Thermo-Hydraulic Performance and Irreversibility Behaviour in a Pulsating Turbulent Flow Ribbed Duct

This paper numerically investigates the thermo-hydraulic performance and irreversibility characteristics in a single-pass duct with attached and detached ribs subjected to pulsating turbulent flow. The pulsation frequency is varied from 15.3 to 70.3 Hz with the inlet Reynolds number (Re) ranging fro...

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Bibliographic Details
Published in:Arabian journal for science and engineering (2011) 2024-02, Vol.49 (2), p.1515-1529
Main Authors: Sofi, Amir Yousf, Qayoum, Adnan
Format: Article
Language:English
Subjects:
Detaching
Engineering
Entropy
Finite element method
Fluid dynamics
Fluid flow
Frequency ranges
Friction factor
Heat transfer
Humanities and Social Sciences
Mathematical analysis
multidisciplinary
Performance indices
Pulsation
Research Article-Mechanical Engineering
Reynolds number
Science
Turbulent flow
Unsteady flow
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Summary:This paper numerically investigates the thermo-hydraulic performance and irreversibility characteristics in a single-pass duct with attached and detached ribs subjected to pulsating turbulent flow. The pulsation frequency is varied from 15.3 to 70.3 Hz with the inlet Reynolds number (Re) ranging from 5000 to 20,000. The variation of Nusselt number, friction factor, Thermal Performance Index (TPI) and Augmented Entropy Generation Number (AEG) with frequency and Re has been evaluated using Finite Element Method (FEM). The simulation results reveal that the heat transfer characteristics of both attached and detached ribs increase significantly with pulsating flow at the inlet of the channel. Detached ribs with pulsating flow at the inlet depict superior heat transfer augmenting characteristics and relatively smaller Augmented Entropy Generation Numbers in comparison with attached ribs. At an inlet pulsation frequency of 15.3 Hz, a 78.43% increase in overall Thermal Performance Index is observed in detached ribs with an AEG of 0.71. Attached ribs exhibit a 49.9% enhancement in heat transfer at a pulsation frequency of 30.1 Hz and a lowest AEG of 0.79 at a pulsation frequency of 15.3 Hz. The detached ribs with pulsating flow at inlet outperform the attached ribs within a certain frequency range.
ISSN:2193-567X
1319-8025
2191-4281
DOI:10.1007/s13369-023-07902-w