Denali National Park Weather Forecast for Wednesday, April 19. The Denali National Park, AK forecast for Apr 19 is 47 degrees and Patchy rain possible . There is 69 percentage chance of rain and 12 mph winds from the South-Southeast.
Topics: Introduction Equations Discharge Coefficients Error Messages References. Introduction to Orifice Flow Meter Calculation. Orifice flow meters are used to determine a liquid or gas flow rate by measuring the differential pressure (P1 - P2) across the orifice plate. The two standard pressure tapping arrangements for small bore orifices are shown in the drawings; the location of the pressure taps affects the discharge coefficient somewhat.
Reduction of cross-section of the flowing stream in passing through orifice increases the velocity head at the expense of pressure head. Reduction of pressure between taps is measured using manometer. Formation of Vena-contracta-Fluid stream separates from the downstream side of the orifice plate and forms a free-flowing jet in the downstream side. Orifice coefficients are more empirical than those for the Venturi meter.