Community Research and Development Information Service - CORDIS


Pipe roughness and Reynolds number limits to be associated with the new orifice plate discharge coefficient equation agreed at New Orleans in 1988 are derived. Since these depend on the uncertainty of the equation, this is calculated. Data on the effect of pipe roughness on the discharge coefficient are presented. A formula to fit the data is obtained and roughness limits for the equation are tabulated. There is no upper limit on Reynolds number due to the physical basis of the equation. The lower limit is shown to be equal to the minimum Reynolds number in the EEC/API database, expressed as a function of diameter ratio.

Additional information

Authors: READER-HARRIS M J, National Engineering Laboratory, Glasgow (GB)
Bibliographic Reference: Paper presented: Second International Symposium on Fluid Flow Measurement, Calgary (CA), June 6-8, 1990
Availability: Available from (1) as Paper EN 35631 ORA
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top