Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Numerical investigation of heat and fluid features on a flat plate affected by a self-oscillator impingement jet

Document Type : Original Article

Authors
Mohadeseh Khodkameh, 1
Farid Dolati 2
Nima Amanifard, 3
Abdollahzadehsangroudi, Mohammadmahdi 4
1 Master student, University of Guilan, Rasht, Iran
2 Assistant Professor, University of Guilan, Rasht, Iran
3 Professor.University of Guilan, Rasht, Iran
4 Assistant Professor, University of Beira Interior, Portugal
Abstract
In this study, the flow field and the impingement heat transfer of fluidic oscillators at narrow spaces are investigated numerically. Simulations are performed in 2-D, incompressible, and unsteady conditions and the aim is to analyze the effects of the jet to wall distance, the external nozzle angle, the Reynolds number, and removing the external nozzle on the heat transfer performance. Also, for a comprehensive review, the results of the fluidic oscillator are compared with the results of the steady jet. To ensure the validity of the numerical simulations, two experimental researches are applied for the fluidic oscillator and the steady jet and a good agreement is observed between the present simulations and the experimental data. The results show that increasing the distance in fluidic oscillators causes a maximum decrease of about 11% at the Nusselt number of the stagnation point, while employing the various distances does not have a significant effect on the steady jet. In addition, the configuration of the different external nozzle angles affects the Nusselt number, but this influence does not have a monotonic behavior. Furthermore, the Nusselt number increases by removing the external nozzle. When the Reynolds number increases for the fluidic oscillator and the steady jet, the Nusselt number of the stagnation point increases by at least about 22 and 28%, respectively.
Keywords
Heat transfer
Impinging jet
Numerical simulation
Flow field
Fluidic oscillator

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Fluid Mechanics & Aerodynamics
Volume 12, Issue 2 - Serial Number 32
Autumn and winter
March 2024
Pages 115-128

  • Receive Date 24 November 2023
  • Revise Date 25 January 2024
  • Accept Date 07 February 2024
  • Publish Date 19 February 2024