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Air Pressure Measurement in the Rarefied Gas Transition Region.

AD473766

Publication Date	1965
Personal Author	Brunschwig, F. S.
Page Count	87
Abstract	Presented are parameters and pressure corrections for a low air pressure (1-100 p.s.f.a.) measurement system consisting of a pressure transducer and tubing ported to a hot surface at temperatures to 2800 F. Included are results of laboratory measurements with argon and air under conditions of both thermal creep and slip flow occurring together in a pressure transmission tube under temperature gradients. Both temperature functions, thermal creep and slip flow, were found to affect the system pressure. Dynamically, the temperature dependance of slip flow affects time response for tubes since it has the temperature dependancy of gas viscosity. Integration of the tubular time constant, modified for slip flow along the tube's temperature gradient, is carried out and compared to measurements; fair agreement is shown. Work reported includes calibration of a commerical airborne alpha emission pressure transducer; also data is presented on adsorption/oxidation at temperature for pressure tubing material. (Author)
Keywords	Transducers Low pressure Pressure gages Rarefied gas dynamics Air Argon Viscosity Gas flow Temperature Creep Atmosphere entry Titanium Refractory metals Pipes Surfaces Surface temperature Nonequilibrium flow High temperature Design Performance(Engineering) Airborne Calibration Experimental data Slip flow Thermal creep Transition flow X-20 spacecraft
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	51C - Aircraft 51A - Aerodynamics
Corporate Authors	Boeing CO Seattle Wash Aerospace Group
Document Type	Technical Report
Title Note	Final rept. Apr 64-Mar 65.
NTIS Issue Number	197716
Contract Number	AF 33(615)-1793

Air Pressure Measurement in the Rarefied Gas Transition Region.

Air Pressure Measurement in the Rarefied Gas Transition Region.
AD473766

Publication Date	1965
Personal Author	Brunschwig, F. S.
Page Count	87
Abstract	Presented are parameters and pressure corrections for a low air pressure (1-100 p.s.f.a.) measurement system consisting of a pressure transducer and tubing ported to a hot surface at temperatures to 2800 F. Included are results of laboratory measurements with argon and air under conditions of both thermal creep and slip flow occurring together in a pressure transmission tube under temperature gradients. Both temperature functions, thermal creep and slip flow, were found to affect the system pressure. Dynamically, the temperature dependance of slip flow affects time response for tubes since it has the temperature dependancy of gas viscosity. Integration of the tubular time constant, modified for slip flow along the tube's temperature gradient, is carried out and compared to measurements; fair agreement is shown. Work reported includes calibration of a commerical airborne alpha emission pressure transducer; also data is presented on adsorption/oxidation at temperature for pressure tubing material. (Author)
Keywords	Transducers Low pressure Pressure gages Rarefied gas dynamics Air Argon Viscosity Gas flow Temperature Creep Atmosphere entry Titanium Refractory metals Pipes Surfaces Surface temperature Nonequilibrium flow High temperature Design Performance(Engineering) Airborne Calibration Experimental data Slip flow Thermal creep Transition flow X-20 spacecraft
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	51C - Aircraft 51A - Aerodynamics
Corporate Authors	Boeing CO Seattle Wash Aerospace Group
Document Type	Technical Report
Title Note	Final rept. Apr 64-Mar 65.
NTIS Issue Number	197716
Contract Number	AF 33(615)-1793