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Linear Hydrodynamic Stability of Fluid Flow in Curved Rectangular Ducts: Semi-Analytical Study

Published online by Cambridge University Press:  09 August 2019

H. Nowruzi ,
H. Ghassemi Open the ORCID record for H. Ghassemi [Opens in a new window]  and
S. S. Nourazar
H. Nowruzi
Affiliation:
Department of Maritime Engineering, Amirkabir University of Technology (Tehran Polytechnic)Tehran, Iran
H. Ghassemi*
Affiliation:
Department of Maritime Engineering, Amirkabir University of Technology (Tehran Polytechnic)Tehran, Iran
S. S. Nourazar
Affiliation:
Department of Mechanical EngineeringAmirkabir University of Technology (Tehran Polytechnic)Tehran, Iran
*
*Corresponding author (gasemi@aut.ac.ir)
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Abstract

In the current study, for the first time, a semi-analytical technique is used for solving eigenvalue problem arising from linear hydrodynamics stability of fluid flow through the curved rectangular ducts at different curvature ratios and aspect ratios. To this accomplishment, symmetric disturbances are assumed and the Homotopy perturbation method (HPM) is applied to solve our eigenvalue problem for curvature ratios ranging from 0.01 to 0.8 and aspect ratios ranging from 0.05 to 20. Our semi-analytical results are validated through the existing numerical and experimental data, showing good agreement. The semi-analytical results indicate that, as the curvature ratio increases the critical Dean number (Dnc) is increased and the flow becomes more stable, especially for aspect ratios lower than 1.Moreover, for all intended curvature ratios, irregular behavior in variation of Dnc is detected by an increase in the aspect ratio. So that, the Dnc is decreased when the aspect ratio increases from 0.05 up to 1 and the fluid flow becomes unstable. When the aspect ratio is increased from 1 to 5, it causes to increase the Dnc and fluid flow becomes stable. Furthermore, when the aspect ratio increases from 5 to 20, the Dnc is decreased again. In addition, Dnc and eigenvalues of critical complex wave number corresponding to Dnc for the onset of Dean flow instability is reported under different curvature ratios and aspect ratios.

Keywords

Hydrodynamic stabilityCritical Dean numberAspect ratioCurvature ratioSemi analytical method
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 5 , October 2019 , pp. 747 - 765
Copyright
© The Society of Theoretical and Applied Mechanics 2019 

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