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Journal of Flow Visualization and Image Processing

Publication de 4  numéros par an

ISSN Imprimer: 1065-3090

ISSN En ligne: 1940-4336

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PIV STUDY OF RADIAL WALL JET FORMED BY A NORMALLY IMPINGING TURBULENT SYNTHETIC JET

Volume 26, Numéro 2, 2019, pp. 99-126
DOI: 10.1615/JFlowVisImageProc.2019029526
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RÉSUMÉ

In this work, the flow field measurement of turbulent synthetic jet is undertaken using particle image velocimetry (PIV). The measurements are performed with the aim of understanding the basic fluid flow processes in the wall region of an impinging synthetic jet and of better understanding the heat transfer processes involved in such flows. The study has been performed at a Reynolds number of 5588, Strouhal number of 0.165, and Stokes number of 75 for three different orifice-to-wall distances (z/d = 1, 3, and 8, where d is the orifice diameter). The locations have been chosen because the heat transfer characteristics of synthetic jet and its behavior are different at these axial locations. The instantaneous flow fields of impinging jet show the strong impact of vortices on the ensuing flow and behave differently for different surface spacings near the stagnation region and in the wall jet region. Formation of a large recirculation region is noted at a lower axial distance of z/d = 1, where the effect of confinement is particularly large compared to other surface spacings. A detailed quantitative analysis of mean and RMS velocity profiles has also been undertaken in the study. It is observed that beyond the radial location (r) of 2.5d, the boundary layer thickness grows linearly. The variation of mass flow rate with r can be described by the power law r0.49. The PIV measurements further show that the nature of axial velocity profiles changes with axial distance. At an axial distance of z/d = 3, two axisymmetric secondary peaks are observed but at the higher axial distance of z/d = 8 such secondary peaks are absent. The flow is found to be reasonably isotropic in both the near-stagnation and self-similar regimes. These detailed observations are important for better understanding of heat transfer from impinging synthetic jets.

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CITÉ PAR
  1. Lyu Yuan-wei, Zhang Jing-zhou, Tan Jun-wen, Shan Yong, Impingement heat transfer on flat and concave surfaces by piston-driven synthetic jet from planar lobed orifice, International Journal of Heat and Mass Transfer, 167, 2021. Crossref

  2. Antony Justin, Maniyeri Ranjith, Modeling and simulation of fluid-structure interaction using smoothed particle hydrodynamics, Materials Today: Proceedings, 47, 2021. Crossref

  3. Sharma Pawan, Singh Pushpanjay K., Sahu Santosh K., Yadav Harekrishna, A Critical Review on Flow and Heat Transfer Characteristics of Synthetic Jet, Transactions of the Indian National Academy of Engineering, 7, 1, 2022. Crossref

  4. Bhapkar Udaysinh S., Mishra Abhishek, Yadav Harekrishna, Agrawal Amit, Effect of orifice shape on impinging synthetic jet, Physics of Fluids, 34, 8, 2022. Crossref

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