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You searched on: Author: michael moldover

Displaying records 11 to 20 of 102 records.
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11. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911784

12. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910927

13. TESTING LONG-WAVELENGTH ACOUSTIC FLOWMETER CONCEPTS FOR FLUE GAS FLOWS
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911460

14. Airspeed Calibration Services: Laser Doppler Anemometer Calibration and Its Uncertainty
Published: 6/20/2012
Authors: Iosif I Shinder, Michael R Moldover, James 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911456

15. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908560

16. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909672

17. Calibrations of Multi-Hole Pitot Tubes Depend on Tubulence
Published: 3/19/2012
Authors: Iosif I Shinder, Christopher J. Crowley, Michael R Moldover
Abstract: NIST is developing techniques to calibrate 2- and 3-dimensional anemometer systems (such as multi-hole pitot tubes) with a resolution of 0.3 %. The pitch and yaw response of multi-hole pitot tubes is complicated; therefore, calibrations require hund ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910815

18. Semiclassical fifth virial coefficients for improved ab initio helium-­4 standards
Published: 2/15/2012
Authors: Katherine Shaul, Andrew Schultz, David Kofke, Michael R Moldover
Abstract: For helium-4, we present ab initio, semi-classical calculations of virial coefficients Bn for for n = 2, 3, 4, and 5 from 50 K to 1000 K. Using our values of B4 and B5 and the more accurate literature values of B2 and B3, we argue that the ab initio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910524

19. Improved First-Principles Calculation of the Third Virial Coefficient of Helium
Series: Journal of Research (NIST JRES)
Published: 8/31/2011
Authors: Giovanni Garberoglio, Michael R Moldover, Allan H Harvey
Abstract: We employ state-of-the-art pair and three-body potentials for helium to calculate its third density virial coefficient C(T) with uncertainties much smaller than those of the best experimental results, and approximately one-fourth the uncertainty of o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907954

20. Progress toward redetermining the Boltzmann constant with a fixed-path-length cylindrical resonator
Published: 5/21/2011
Authors: Jintao Zhang, H. Lin, X.J. Feng, J.P. Sun, Keith A Gillis, Michael R Moldover, Y.Y. Duan
Abstract: We used a single, fixed-path-length cylindrical-cavity resonator to measure {I}c{/I}^d0^ = (307.8252 {+ or -} 0.0012) m{bullet}s^u−1^, the zero-density limit of the speed of sound in pure argon at the temperature of the triple point of water. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907610



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