Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Aaron Johnson (Fed)

Displaying 51 - 53 of 53

The Effect of Vibrational Relaxation of the Discharge Coefficient of Critical Flow Venturis

December 1, 2000

Author(s)

Aaron N. Johnson, John D. Wright, Shin-ichi Nakao, C L. Merkle, Michael R. Moldover

This paper identifies a new mechanism that can affect the discharge coefficient of critical nozzle flows. Specifically, vibrational relaxation effects are demonstrated to significantly influence the discharge coefficient of selected gases in critical

Uncertainty in Primary Gas Flow Standards Due to Flow Work Phenomena

June 1, 2000

Author(s)

John D. Wright, Aaron N. Johnson

Static gravimetric and static volumetric gas flow standards are both affected by uncertainty components related to the measurement of the change of mass of gas within the inventory volume. In the process of diverting gas into the collection vessel, rapid

Numerical Characterization Of The Discharge Coefficient In Critical Nozzles

July 1, 1998

Author(s)

Aaron N. Johnson, Pedro I. Espina, John D. Wright, G E. Mattingly, C L. Merkle

The discharge coefficient in critical nozzles flowing N 2, Ar, CO 2, and H 2 in the Reynolds Number range (2,000 to 22,000) is studied computationally to assess the capability of Computational Fluid Dynamics (CFD) in assisting experimental calibration. A