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Author: Aaron Johnson

Displaying records 1 to 10 of 32 records.
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1. An Uncertainty Analysis of Mean Flow Velocity Measurements Used to Quantify Emissions from Stationary Sources
Published: 5/20/2014
Authors: Rodney A Bryant, Olatunde B. Sanni, Elizabeth F Moore, Matthew F Bundy, Aaron N Johnson
Abstract: Point velocity measurements conducted by traversing a pitot tube across the cross section of a flow conduit continues to be the standard practice for evaluating the accuracy of continuous flow monitoring devices. Such velocity traverses were condu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914663

2. Liquid Flow Meter Calibrations with the 0.1 L/s and 2.5 L/s Piston Provers
Series: Special Publication (NIST SP)
Report Number: 250-1039r1
Published: 1/15/2014
Authors: Jodie G Pope, John D Wright, Aaron N Johnson, Christopher J. Crowley
Abstract: This document provides a description of the 2.5 L/s and 0.1 L/s liquid flow calibration standards operated by the National Institute of Standards and Technology (NIST) Fluid Metrology Group to provide flow meter calibrations for customers. The 0 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914768

3. Blow-Down Calibration of a Large 8 Path Ultrasonic Flow Meter under Quasi-Steady Flow Conditions
Published: 9/26/2013
Authors: Aaron N Johnson, Eric Harman, Joey T Boyd
Abstract: An array of critical flow venturis (CFVs) was installed in a blow-down facility and used to calibrate a large (i.e., D = 89.5 cm) 8 path ultrasonic flow meter (USM) at atmospheric pressure. The calibration was performed in dry air over a flow range ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914473

4. Greenhouse Gas Emissions and Dispersion #2. Comparison of FDS Predictions with Gas Velocity Measurements in the Exhaust Duct of a Stationary Source
Series: Special Publication (NIST SP)
Report Number: 1159
Published: 4/25/2013
Authors: Kuldeep R Prasad, Kevin Li, Elizabeth F Moore, Rodney A Bryant, Aaron N Johnson, James R Whetstone
Abstract: The burning of fossil fuels remains a major source of greenhouse gases responsible for global warming and climate change. In order to reduce greenhouse gas emissions, it is imperative to develop a capability to accurately measure these emission ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912448

5. Computational Fluid Dynamic (CFD) Investigation of NIST‰s Scale Model Smokestack Simulator
Published: 3/27/2013
Authors: Aaron N Johnson, Jacob E Ricker, Joey T Boyd
Abstract: Accurate flow measurements are essential to quantifying the amount of greenhouse gases (GHGs) and other pollutants emitted from the smokestacks of coal-fired power plants (CFPPs). However, flow measurement accuracy is limited by the adverse flow con ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913525

6. Improved Nozzle Manifold for Gas Flow Calibrations
Published: 6/20/2012
Authors: Aaron N Johnson, Chunhui Li, John D Wright, Gina M Kline, Christopher J. Crowley
Abstract: We developed a new nozzle manifold that reduced the uncertainty of flow calibrations from 0.09 % to as low as 0.074 % for flows of air up to 0.84 kg/s (43 000 L/min at reference conditions of 101.325 kPa and 293.15 K). The nozzle manifold also reduc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911475

7. 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

8. Bilateral Comparison between NIST and PTB for Flows of High Pressure Natural Gas
Published: 4/6/2012
Authors: Aaron N Johnson, B Mickan, H. Toebben, Tom Kegel
Abstract: In 2009 NIST developed a U.S. national flow standard to provide traceability for flow meters used for custody transfer of pipeline quality natural gas. NIST disseminates the SI unit of flow by calibrating a customer flow meter against a parallel arr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910709

9. A Comparison of 12 US Liquid Hydrocarbon Flow Standards and the Transition to Safer Calibration Liquids
Published: 4/1/2012
Authors: John D Wright, Aaron N Johnson, Gina M Kline, Christopher J. Crowley, Jodie G Pope, Vern E. Bean
Abstract: During 2010 and 2011, NIST piloted a 12-laboratory comparison of hydrocarbon liquid flow calibration standards spanning the range 3.8 L/min to 38 L/min. The laboratories were in mutual agreement within the expected 0.3 % uncertainty, which is approx ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910867

10. Comparison of Gas Velocity Measurements and CFD Predictions in the Exhaust Duct of a Stationary Source
Published: 7/13/2011
Authors: Rodney A Bryant, Olatunde B. Sanni, Elizabeth F Moore, Robert P. Borthwick, Marco G Fernandez, Iosif I Shinder, Jiann C Yang, Aaron N Johnson
Abstract: Two series of independent flow measurements were conducted for cross validation of flow velocity in the exhaust duct of the NIST Large Fire Laboratory. In the first series, two pressure measurement probe types, an S probe and a 3-D probe, were used t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908658



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