Flow and mixing characteristics of dual parallel plane jets subject to acoustic excitation
The effects of jet pulsation intensity and excitation Strouhal number on the flow and dispersion characteristics of dual parallel plane jets at a low Reynolds number of 200 were experimentally studied so that the transition from laminar to turbulence was focused. A hot-wire anemometer was used to re...
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| Published in | European journal of mechanics, B, Fluids Vol. 85; pp. 444 - 457 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Masson SAS
01.01.2021
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0997-7546 1873-7390 |
| DOI | 10.1016/j.euromechflu.2020.11.003 |
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| Abstract | The effects of jet pulsation intensity and excitation Strouhal number on the flow and dispersion characteristics of dual parallel plane jets at a low Reynolds number of 200 were experimentally studied so that the transition from laminar to turbulence was focused. A hot-wire anemometer was used to record the jet velocities. The flow patterns were obtained using the laser-light sheet assisted smoke flow visualization technique. Jet spread widths were derived from the long-exposure images using the binary edge detection method. The jet fluid dispersion characteristics were examined using the tracer-gas concentration detection technique. Four characteristic flow modes (discrete coherent vortices, contiguous coherent vortices, early vortex breakup, and lateral dispersion) were identified in the domain of the jet pulsation intensity and excitation Strouhal number. At small jet pulsation intensities, discrete and contiguous coherent vortices appeared at low and high excitation Strouhal numbers, respectively. The vortices appearing in the jet shear layers broke up slowly and caused small jet expansions and turbulent intensities, thus inducing a low efficiency of jet fluid dispersion. The early vortex breakup mode was induced by the low-frequency back-and-forth flow motions in the near region at large jet pulsation intensities and low excitation Strouhal numbers. Large turbulence fluctuations caused by the early vortex breakup increased the jet dispersion significantly. At large jet pulsation intensities and excitation Strouhal numbers, high-frequency back-and-forth flow motions in the region near the jet exits significantly reduced the time-averaged axial momentum and induced large lateral jet expansion and jet fluid dispersions.
•Different flow regimes were observed in different domain of excitation Strouhal numbers and jet pulsation intensities.•Excitation Strouhal number and jet pulsation intensity significantly influenced jet velocities near jet exits.•Time-averaged velocity and turbulence fluctuations were greater at low excitation Strouhal number and high jet pulsation intensity.•Axial and lateral mixing indices revealed gigantic mixing of jet fluids. |
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| AbstractList | The effects of jet pulsation intensity and excitation Strouhal number on the flow and dispersion characteristics of dual parallel plane jets at a low Reynolds number of 200 were experimentally studied so that the transition from laminar to turbulence was focused. A hot-wire anemometer was used to record the jet velocities. The flow patterns were obtained using the laser-light sheet assisted smoke flow visualization technique. Jet spread widths were derived from the long-exposure images using the binary edge detection method. The jet fluid dispersion characteristics were examined using the tracer-gas concentration detection technique. Four characteristic flow modes (discrete coherent vortices, contiguous coherent vortices, early vortex breakup, and lateral dispersion) were identified in the domain of the jet pulsation intensity and excitation Strouhal number. At small jet pulsation intensities, discrete and contiguous coherent vortices appeared at low and high excitation Strouhal numbers, respectively. The vortices appearing in the jet shear layers broke up slowly and caused small jet expansions and turbulent intensities, thus inducing a low efficiency of jet fluid dispersion. The early vortex breakup mode was induced by the low-frequency back-and-forth flow motions in the near region at large jet pulsation intensities and low excitation Strouhal numbers. Large turbulence fluctuations caused by the early vortex breakup increased the jet dispersion significantly. At large jet pulsation intensities and excitation Strouhal numbers, high-frequency back-and-forth flow motions in the region near the jet exits significantly reduced the time-averaged axial momentum and induced large lateral jet expansion and jet fluid dispersions.
•Different flow regimes were observed in different domain of excitation Strouhal numbers and jet pulsation intensities.•Excitation Strouhal number and jet pulsation intensity significantly influenced jet velocities near jet exits.•Time-averaged velocity and turbulence fluctuations were greater at low excitation Strouhal number and high jet pulsation intensity.•Axial and lateral mixing indices revealed gigantic mixing of jet fluids. |
| Author | Huang, Rong Fung Kumar, Sanjay Hsu, Ching Min |
| Author_xml | – sequence: 1 givenname: Sanjay surname: Kumar fullname: Kumar, Sanjay organization: Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan, ROC – sequence: 2 givenname: Rong Fung surname: Huang fullname: Huang, Rong Fung email: rfhuang@mail.ntust.edu.tw organization: Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, 10607, Taiwan, ROC – sequence: 3 givenname: Ching Min surname: Hsu fullname: Hsu, Ching Min organization: Department of Mechanical Design Engineering, National Formosa University, Yunlin, 63201, Taiwan, ROC |
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