Title:
OSCILLATORY MOTION BASED MEASUREMENT METHOD AND SENSOR FOR MEASURING WALL SHEAR STRESS DUE TO FLUID FLOW
Document Type and Number:
WIPO Patent Application WO2004106844
Kind Code:
A3
Abstract:
A shear stress sensor (10) for measuring fluid wall shear stress on a test surface is provided. The wall shear stress sensor is comprised of an active sensing surface (12) and a sensor body (14). An elastic mechanism mounted between the active sensing surface and the sensor body allows movement between the active sensing surface and the sensor body. A driving mechanism (22) forces the shear stress sensor to oscillate. A measuring mechanism (24) measures displacement of the active sensing surface relative to the sensor body. The sensor may be operated under periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor measurably changes the amplitude or phase of the motion of the active sensing surface, or changes the force and power required from a control system in order to maintain constant motion. The device may be operated under non-periodic excitation where changes in the nature of the fluid properties or the fluid flow over the sensor change the transient motion of the active sensor surface or change the force and power required from a control system to maintain a specified transient motion of the active sensor surface.
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Inventors:
ARMSTRONG WILLIAM D (US)
NAUGHTON JONATHAN (US)
LINDBERG WILLIAM R (US)
NAUGHTON JONATHAN (US)
LINDBERG WILLIAM R (US)
Application Number:
PCT/US2004/015904
Publication Date:
May 06, 2005
Filing Date:
May 20, 2004
Export Citation:
Assignee:
UNIV WYOMING (US)
ARMSTRONG WILLIAM D (US)
NAUGHTON JONATHAN (US)
LINDBERG WILLIAM R (US)
ARMSTRONG WILLIAM D (US)
NAUGHTON JONATHAN (US)
LINDBERG WILLIAM R (US)
International Classes:
G01N13/02; (IPC1-7): G01N3/24
Foreign References:
US4464928A | 1984-08-14 | |||
US4896098A | 1990-01-23 | |||
US5177327A | 1993-01-05 | |||
US5961080A | 1999-10-05 |
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