An experimental study of subsonic microjets escaping from a flat nozzle

V. M. Aniskin^ab, A. A. Maslov^ab, K. A. Mukhin<sup>a

a</sup> Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
^b Novosibirsk State University

Abstract: We have experimentally studied subsonic laminar gas jets escaping from a flat nozzle with dimensions of 83.3 $\times$ 3600 $\mu$m. Reynolds numbers calculated for the given nozzle height and average flow velocity at the nozzle output edge ranged within 58–154. The working gas was air at room temperature. Distributions of the gas velocity and its pulsation along the jet axis were determined. It is established that the obtained characteristics of laminar subsonic microjets are fundamentally different from those of macroscopic turbulent jets. Based on the results of velocity pulsation measurements, it is shown that a laminar–turbulent flow transition is present and its position is determined.

Received: 12.04.2017

DOI: 10.21883/PJTF.2017.14.44817.16502

 English version: Technical Physics Letters, 2017, 43:7, 638–640

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