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You searched on: Author: robert berg

Displaying records 11 to 20 of 53 records.
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11. Noble gas viscosities at 25 degrees C
Published: 8/10/2012
Authors: Robert F Berg, William Cody Burton
Abstract: Near 25 C, ab initio calculations of the zero-density viscosity of helium gas eta_He have an uncertainty of approximately 0.001 %, which is 1/40th of the uncertainty of the best measurements. The uncertainties of the published calculations for neon [ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911234

12. 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

13. Thermoelectric temperature control device for vapor pressure measurements
Published: 8/31/2011
Author: Robert F Berg
Abstract: The static method of measuring equilibrium vapor pressure requires locating the sample at the coldest part of the apparatus to avoid errors due to evaporation and recondensation elsewhere. This paper describes a device that can hold the sample 1 K ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908721

14. Accurate Measurements of Process Gas Flow with Laminar Flow Meters
Published: 10/15/2010
Authors: Thiago Cobu, Robert F Berg, John D Wright, Michael R Moldover
Abstract: We calibrated three models of commercially-manufactured, laminar flow meters (LFMs) with nitrogen at four pressures (100 kPa, 200 kPa, 300 kPa, and 400 kPa) over a 10:1 flow range using NIST‰s primary flow standards and a physical model. Without addi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906313

15. Capillary flow meter for calibrating spinning rotor gauges
Published: 8/6/2008
Author: Robert F Berg
Abstract: This article describes a capillary flow meter whose maximum flow rate of 0.2 micromol/s (~0.2 cm3/min at ambient conditions) covers the range that is useful for calibrating spinning rotor gauges. Knowing the input pressure, output pressure, and tempe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915341

16. Shear Thinning Near the Critical Point of Xenon
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830987

17. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Published: 8/1/2007
Authors: E May, Robert F Berg, Michael R Moldover
Abstract: We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the unce ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830996

18. Transport Properties of Argon at Zero Density From Viscosity-Ratio Measurements
Published: 4/1/2006
Authors: E May, Michael R Moldover, Robert F Berg, John J. Hurly
Abstract: We determined the zero-density viscosity and thermal conductivity of argon with an uncertainty of only 0.039 % in the temperature range 200 K to 400 K. Our results will improve: (1) the argon-argon interatomic potential, (2) calculated boundary-laye ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830959

19. Erratum: Simple Flow Meter and Viscometer for Gases With 0.04 % Uncertainty [Metrologia 42, 11-23 (2005)]
Published: 2/1/2006
Author: Robert F Berg
Abstract: This is an erratum.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830958

20. Viscosity
Published: 12/1/2005
Author: Robert F Berg
Abstract: This article summarizes the role of viscosity in describing the properties and flow of fluids. Its measurement, dependences on temperature and density, and deviations from Newtonian behavior are discussed. Example plots and a bibliography are include ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830924



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