Colinear Fluctuating Wall Shear Stress and Fluctuating Pressure Transducer.
Patent, Filed 25 Apr 88, patented 8 Aug 89,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent discloses a unique combination of two transducers. A hot film shear stress gauge and a piezoelectric pressure transducer are coaxially located along the longitudinal centerline of a cylindrical metal shell. The hot film shear stress gauge is exposed to the fluid while the pressure transducer is positioned directly below. Conductors are attached to each and the remaining volume filled with plastic to form a colinear unit. The conductors attached to the hot film element provide power while the conductors attached to the piezoelectric transducer transmit pressure produced electrical signals therefrom. The resulting configuration allows the measurement of fluctuating shear stress and fluctuating pressure to be made simultaneously at a single spatial location at a solid wall bounding a turbulent fluid flow layer. jhd
- Hydraulic and Pneumatic Equipment