Numerical Simulation of turbulent flow and heat transfer from pulsating impinging jet to Asymmetrical concave surface

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Abstract

In this study, the numerical analysis of turbulent flow and heat transfer of oscillating impinging slot jet on an asymmetric concave surface has been investigated. In this way, the averaged Navier-Stokes equations for turbulent incompressible flow in an unsteady state with k-ε RNG turbulence model and in 2D computational space were solved. The effects of the oscillation frequency, period of oscillation, curved surface, jet distance to surface and jet Reynolds number on time- averaged Nusselt number distribution in the concave surface were studied. The obtained results show that applying the pulsating jet in the range of 40 Hz to 160 Hz can increase heat transfer from the concave surface in comparison with the steady jet. Furthermore, increasing Re Number from 4000 to 8000, and period of oscillation from 0.4 to 1, leads to the increase of the time-averaged Nusselt number. While that with increasing of distance between jet and concave surface the time- averaged Nusselt number, decreased.

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References

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Journal of Solid and Fluid Mechanics
Volume 5, Issue 4 - Serial Number 4
January and February 2016
Pages 271-281

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