Accession Number : ADD014296

Title :   Colinear Fluctuating Wall Shear Stress and Fluctuating Pressure Transducer.

Descriptive Note : Patent, Filed 25 Apr 88, patented 8 Aug 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Keith, William L

Report Date : 08 Aug 1989

Pagination or Media Count : 6

Abstract : 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)

Descriptors :   *STRAIN GAGES, *PATENTS, *PIEZOELECTRIC TRANSDUCERS, *PRESSURE TRANSDUCERS, BOUNDARIES, CYLINDRICAL BODIES, ELECTRICITY, FILMS, FLUID FLOW, LAYERS, METALS, POSITION(LOCATION), SHEAR STRESSES, SHELLS(STRUCTURAL FORMS), SIGNALS, SOLIDS, SPATIAL DISTRIBUTION, TURBULENT FLOW, WALLS

Subject Categories : Hydraulic and Pneumatic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE