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Structure of subsonic plane microjets

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Abstract

Results of experiments aimed at studying subsonic microjets escaping from a plane nozzle are reported. The Reynolds numbers based on the nozzle height and mean flow velocity at the nozzle exit are varied from 27 to 139, whereas the nozzle size is fixed at 83.3 × 3823 µm. The test gas is air at room temperature. The distributions of velocity and velocity fluctuations along the jet axis and in the lateral and transverse directions are determined. The fact of the laminar–turbulent transition in the jet is detected. The data obtained are compared with theoretical predictions for laminar plane jets. The experimental and theoretical data are found to be in good agreement at the laminar segment of the microjet.

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Abbreviations

AR:

Aspect ratio w/h

h:

Nozzle height

K:

Kinematic impulse

Ku :

Jet decay rate

Ky :

Jet spreading rate

Re:

Jet Reynolds number

U:

Velocity in the x direction

Uav :

Mean velocity at the nozzle exit

UC :

Centerline velocity in the x direction

UC0 :

The maximum jet velocity at the nozzle exit

u′:

Fluctuating velocity component in the x direction

w:

Nozzle width

x0 :

Distance between the virtual source of the theoretical jet and the nozzle exit of the real jet

x, y, z:

Streamwise (x), lateral (y) and transverse (z) coordinates

y0.5, z0.5 :

Jet half-width, i.e., the distance at which the velocity value equal to one-half of the maximum value

\(\nu\) :

Kinematic viscosity

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Acknowledgements

The work was supported by the Russian Science Foundation (Grant no. 17-19-01157, methodical part of this work) and RFBR (Project no. 18-31-00272).

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Authors and Affiliations

  1. Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation

    V. M. Aniskin & A. A. Maslov

  2. Novosibirsk State University, 630090, Novosibirsk, Russian Federation

    A. A. Maslov & K. A. Mukhin

Authors
  1. V. M. Aniskin
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  2. A. A. Maslov
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  3. K. A. Mukhin
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Correspondence to V. M. Aniskin.

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Aniskin, V.M., Maslov, A.A. & Mukhin, K.A. Structure of subsonic plane microjets. Microfluid Nanofluid 23, 57 (2019). https://doi.org/10.1007/s10404-019-2223-0

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