Experiments in Fluids

, Volume 17, Issue 1–2, pp 24–31 | Cite as

Small silicon based pressure transducers for measurements in turbulent boundary layers

  • L. Löfdahl
  • E. Kälvesten
  • G. Stemme


Small silicon based sensors for the measurement of wall-pressure in turbulent flows have been designed and fabricated using microelectronic technology. The sensor diaphragms have a side length of 100 and 300 μm, and polysilicon piezoresistive gauges were used for detection of the deflection. A two-dimensional flat plate boundary layer was employed to determine the performance of the pressure transducers, and comparisons with established data from the literature were made. A threshold value for the pressure fluctuations of about the double Kolmogorov length scale was estimated independently from the probability distribution as well as from the power spectra. In good agreement with theoretical predictions of Blake (1986), the slope of the power spectra was found to beω−1 in the intermediate andω−5 in the high frequency range.


Boundary Layer Fluid Dynamics Power Spectrum Pressure Transducer Flat Plate 
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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • L. Löfdahl
    • 1
  • E. Kälvesten
    • 2
  • G. Stemme
    • 2
  1. 1.Thermo and Fluid Dynamics, Chalmers University of TechnologyGöteborgSweden
  2. 2.Instrumentation Laboratory, Royal Institute of TechnologyStockholmSweden

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