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You searched on: Author: michael moldover

Displaying records 21 to 30 of 116 records.
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21. Improved Determination of the Boltzmann Constant using a Single, Fixed-Length Cylindrical Cavity
Published: 8/27/2013
Authors: Hong Lin, Keith A Gillis, XiaoJuan Feng, Michael R Moldover, J.P. Sun, J.T. Zhang, Y.Y. Duan
Abstract: We report improvements to our previous [Zhang et al., Intl. J. Thermophysics, 32, 1297 (2011)] determination of the Boltzmann constant kB using a single 80 mm-long cylindrical cavity. In this work, the shape of the gas-filled resonant cavity is clos ...

22. Calibration of a Long-Wavelength Acoustic Flowmeter Using a Lumped Impedance Acoustic Model
Published: 8/26/2013
Authors: Lee James Gorny, Keith A Gillis, Michael R Moldover
Abstract: As a part of NIST‰s program to standardize measurements of greenhouse gas emissions, we are developing long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurement of flue gas flows, for example, from coal-burning power plants. A L ...

23. The Effect of Turbulence on a Multi-Hole Pitot Calibration
Published: 6/10/2013
Authors: Christopher J. Crowley, Iosif I Shinder, Michael R Moldover
Abstract: Abstract- Accurate calibrations of multi-hole Pitot tubes require thousands of measurements spanning ranges of the fluid‰s velocity, and the pitch and yaw angles. When calibrating a commercially-manufactured multi-hole Pitot tube in NIST‰s low-turbul ...

24. Microwave measurements for gas thermometry up to the copper point
Published: 5/13/2013
Authors: XiaoJuan Feng, Keith A Gillis, Michael R Moldover, James B Mehl
Abstract: We measured 5 microwave resonance frequencies {I}f{/I}^dN^ of an argon-filled cylindrical cavity at temperatures up to 1349 K. The repeatability of both the measured frequencies {I}u{/I}({I}f{/I}^dN^) and the scaled half-widths {I}u{/I}({I}g{/I}^dN^ ...

25. Recommended viscosities of 11 dilute gases at 25¿°C
Published: 12/13/2012
Authors: Robert F Berg, Michael R Moldover
Abstract: Commercially manufactured meters that measure the flow of a process gas are often calibrated with a known flow of a surrogate gas. This requires an accurate model of the flow meter and accurate values of the relevant thermophysical properties for bo ...

26. Room Temperature Acoustic Transducers for High-Temperature Thermometry
Published: 7/9/2012
Authors: Dean C Ripple, William E. Murdock, Gregory F Strouse, Keith A Gillis, Michael R Moldover
Abstract: We have successfully conducted highly-accurate, primary acoustic thermometry at 600 K using a sound source and a sound detector at room temperature. We describe the source, the detector, and the ducts that connected them to our cavity resonator. Thi ...

Published: 6/22/2012
Authors: Lee James Gorny, Keith A Gillis, Michael R Moldover
Abstract: As a part of NIST‰s program to standardize measurements of greenhouse gas emissions, we are developing a long-wavelength acoustic flowmeter (LWAF) for accurate, economical measurements of exhaust flows from coal-burning power plants. Measurements of ...

28. Airspeed Calibration Services: Laser Doppler Anemometer Calibration and Its Uncertainty
Published: 6/20/2012
Authors: Iosif I Shinder, Michael R Moldover, J. M. Hall, Mike Duncan, Joe Keck
Abstract: The National Institute of Standards and Technology (NIST) and the Oak Ridge National Laboratory (ORNL) are improving their airspeed calibration services. Both laboratories use spinning disks to generate linear velocities that are traceable to NIST‰s ...

29. Calibration of Laminar Flow Meters for Process Gases
Published: 6/1/2012
Authors: John D Wright, Thiago Cobu, Robert F Berg, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) with five gases (N2, Ar, He, CO2, and SF6) over a 10:1 flow range using NIST‰s primary flow standards as re ...

30. Extended Lee model for the turbine meter & calibrations with surrogate fluids
Published: 5/1/2012
Authors: Jodie G Pope, John D Wright, Aaron N Johnson, Michael R Moldover
Abstract: We developed a physical model termed the ,extended Lee modelŠ for calibrating turbine meters to account for 1) fluid drag on the rotor, 2) bearing static drag and 3) bearing viscous drag. We tested the extended Lee model using a dual rotor, 2.5 cm d ...

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