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Forcing a planar jet flow using MEMS

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Abstract

We present the results of an experimental study in which a planar laminar jet of air was forced by an array of micro-electromechanical systems (MEMS) micro-actuators. In the absence of forcing, the velocity profile of the experimental jet matched the classic analytic solution. Driving actuators on either side of the jet in-phase or anti-phase, respectively, excited the symmetric or anti-symmetric mode of instability of the jet. Asymmetric forcing, using MEMS actuators on only one side of the jet, was also investigated.

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Abbreviations

x, y, z :

Streamwise, cross-stream, and spanwise coordinates

u :

Streamwise velocity

d :

Exit slit width

U 0 :

Centerline streamwise velocity

b :

Jet half-width

v :

Kinematic viscosity

Re :

Reynolds number=U 0 b/v

M :

Momentum flux

δu :

Fluctuating velocity component in x direction

f :

Forcing frequency of MEMS actuators

ω :

Dimensionless frequency of velocity fluctuations=fb/U 0

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Authors and Affiliations

  1. Department of Mechanical Engineering, MIT, Cambridge, MA, 02139, USA

    Thomas Peacock

  2. University of Colorado, Boulder, CO, 80309, USA

    Elizabeth Bradley, Jean Hertzberg & Yung-Cheng Lee

Authors
  1. Thomas Peacock
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  2. Elizabeth Bradley
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  3. Jean Hertzberg
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  4. Yung-Cheng Lee
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Correspondence to Thomas Peacock.

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Peacock, T., Bradley, E., Hertzberg, J. et al. Forcing a planar jet flow using MEMS. Exp Fluids 37, 22–28 (2004). https://doi.org/10.1007/s00348-004-0780-8

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  • DOI: https://doi.org/10.1007/s00348-004-0780-8

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