Stagnation-point flow of Ag-CuO/water hybrid nanofluids over a permeable stretching/shrinking sheet with temporal stability analysis

Present work has been studied the stagnation-point flow of hybrid Ag-CuO/water nanofluids over the stretching/shrinking sheet. The Navier-Stokes equations have reduced to the ordinary differential equations with similarity transformation. Runge-Kutta Fehlberg (RKF45), together with the shooting meth...

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Bibliographic Details
Published in:Powder technology 2021-03, Vol.380, p.152-163
Main Authors: Abbasian Arani, Ali Akbar, Aberoumand, Hossein
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Differential equations
Flow stability
Fluid flow
Friction factor
Hybrid nanofluids (Ag/CuO-water)
Injection
Nanofluids
Numerical analysis
Ordinary differential equations
Parameters
Permeable stretching/shrinking sheet
Runge-Kutta method
Stability analysis
Stagnation
Stagnation-point flow
Stretching
Suction
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Summary:Present work has been studied the stagnation-point flow of hybrid Ag-CuO/water nanofluids over the stretching/shrinking sheet. The Navier-Stokes equations have reduced to the ordinary differential equations with similarity transformation. Runge-Kutta Fehlberg (RKF45), together with the shooting method, is employed to solve the differential equations. Numerical analysis showed that dual solutions exist and are connected to the specific values of the shrinking rate. All figures have the same behavior with the suction/injection parameter. Furthermore, with the intensification of the suction/injection parameter, the graphs are contracted, and the lower solutions become extended. The friction factor of Ag/water and hybrid nanofluids is increased by about 50–70% and 35–50% with suction/injection parameter, respectively. Normalized Nusselt number for Ag/water and hybrid nanofluids are increase by about 150–200% and 100% with suction/injection parameter, respectively. Time-dependent stability analysis showed that only the upper branch of solutions is stable, while the lower branch is not in actual physics. [Display omitted] •Stagnation-point hybrid nanofluid flow was analyzed with stability analysis.•Runge-Kutta Fehlberg with shooting method is used to solve the equations.•Appearance of dual solutions for the shrinking cases was showed graphically.•Ag/water nanofluid with ϕ = 0.1 has the most effect on the friction factor.•Temporal stability analysis revealed that the lower solutions are not stable.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.11.043