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.
It is the ratio between the area of the jet at the vena contracta to the area of the orifice. C c = Area at vena contracta/ Area of orifice. The typical value may be taken as 0.64 for a sharp orifice (concentric with the flow channel). The smaller the value, the more effect the vena contracta has.he effect is also observed in flow from a tank into a pipe, or a sudden contraction in pipe diameter. Streamlines will converge just downstream of the diameter change, and a region of separated flow occurs from the sharp corner of the diameter change and extends past the vena contracta.