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Topic Area: Chemical Engineering
Processing

Displaying records 31 to 40 of 107 records.
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31. Shear Thinning Near the Critical Point of Xenon
Topic: Chemical Engineering & Processing
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

32. Droplet Size Distributions in the Spray From Commercial Fogger Type Pepper Spray Products
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7334
Topic: Chemical Engineering & Processing
Published: 4/1/2008
Authors: Cary Presser, Edward V White, Alim A Fatah
Abstract: This report documents a preliminary investigation of the measurement of droplet sizes in the spray from four commercial fogger type pepper spray products. Droplet sizes were detected over the range of 2 mm to 120 mm by phase Doppler interferometry ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832150

33. Reference Viscosities of H^d2^, CH^d4^, Ar and Xe at Low Densities
Topic: Chemical Engineering & Processing
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

34. The Polarizability of Helium and Gas Metrology
Topic: Chemical Engineering & Processing
Published: 6/22/2007
Authors: James W Schmidt, R Gavioso, E May, Michael R Moldover
Abstract: Using a quasi-spherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability {I}A{/I}^d{epsilon}^ in the limit of zero density. We obtained ({I}A{/I}^d{epsilon},meas^ - {I}A{/I}^d{epsilon},theory^ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830993

35. NIST Calibration Services for Water Flowmeters Water Flow Calibration Facility
Series: Special Publication (NIST SP)
Report Number: 250-73
Topic: Chemical Engineering & Processing
Published: 8/1/2006
Authors: Iosif I Shinder, Iryna V. Marfenko
Abstract: This document describes the Water Flow Calibration Facility (WFCF) at the National Institute of Standards and Technology (NIST). This facility has three parallel pipelines with diameters of 100, 200 and 400 mm and three weighing systems with capaciti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830979

36. A Reference Standard for Measuring Humidity of Air Using a Re-entrant Radio Frequency Resonator
Topic: Chemical Engineering & Processing
Published: 5/2/2006
Authors: Peter H. Huang, Dean C Ripple, Michael R Moldover, Gregory E Scace
Abstract: We developed a stable reference hygrometer suitable for operation at temperatures above ambient that has a robust design, inherent stability, and a well-understood theory of measurement. This hygrometer uses a reentrant, radio-frequency, cavity reson ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902995

37. Relaxation Effects in Small Critical Nozzles
Topic: Chemical Engineering & Processing
Published: 1/1/2006
Authors: Aaron N Johnson, C L Merkle, Michael R Moldover, John D Wright
Abstract: We computed the flow of four gases (He, N^d2^, CO^d2^, and SF^d^6) through a critical nozzle by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for {tau}^drelax^, a species-dependent relaxation time that c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830846

38. Gas Flowmeter Calibrations with the 34 L and 677 L PVTt Standards
Series: Special Publication (NIST SP)
Topic: Chemical Engineering & Processing
Published: 6/23/2004
Authors: John D Wright, Aaron N Johnson, Michael R Moldover, Gina M Kline
Abstract: This document provides a description of the 34 L and 677 L pressure, volume, temperature, and time (PVTt) primary gas flow standards operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. These facilities are used to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830866

39. Temperature Metrology and Its Impact on Industry
Topic: Chemical Engineering & Processing
Published: 9/1/2003
Authors: Hratch G. Semerjian, Ellyn S. Beary
Abstract: Temperature measurement represents one of the most frequently and broadly used measurements, with a majority of products manufactured having temperature measurement devices as an esential component. The accuracy and precision of these temperature me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830018

40. Flow Tele-Metrology
Topic: Chemical Engineering & Processing
Published: 12/1/1999
Author: Pedro I Espina
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=100622



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