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Supersonic axisymmetric microjets: structure and laminar–turbulent transition

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Abstract

The supersonic core length of microjets and the influence of the laminar–turbulent transition on the core length are considered. Axisymmetric mini- and micronozzles with diameters from 341 to 10.4 μm are used. The microjet is studied with the use of a Pitot microtube, shadow flow visualization and hot-wire anemometry. It is demonstrated that the laminar–turbulent transition in the jet mixing layer exerts a dominating effect on the supersonic core length. The increasing of the supersonic core length is associated with the laminar flow in microjet. Decreasing of the supersonic core length is connected with the laminar–turbulent transition in microjet. Based on experimental results, a chart of microjet regimes is constructed. The influence of the Pitot tube diameter on the accuracy of supersonic core length determining is considered. The effect of the nozzle edge roughness on the supersonic core length is examined.

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Acknowledgments

This work was partly supported by the Grant of the Government of the Russian Federation for supporting research supervised by leading scientists in Russian institutions of higher professional education (No. Z50.31.0019 dated 04.03.2014).

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Authors and Affiliations

  1. Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation

    V. M. Aniskin, S. G. Mironov, A. A. Maslov & I. S. Tsyryulnikov

  2. Novosibirsk State University, Novosibirsk, Russian Federation

    V. M. Aniskin, S. G. Mironov, A. A. Maslov & I. S. Tsyryulnikov

Authors
  1. V. M. Aniskin
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  2. S. G. Mironov
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  3. A. A. Maslov
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  4. I. S. Tsyryulnikov
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Correspondence to V. M. Aniskin.

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Aniskin, V.M., Mironov, S.G., Maslov, A.A. et al. Supersonic axisymmetric microjets: structure and laminar–turbulent transition. Microfluid Nanofluid 19, 621–634 (2015). https://doi.org/10.1007/s10404-015-1588-y

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  • DOI: https://doi.org/10.1007/s10404-015-1588-y

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