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.
The ratio of the area of the jet, at vena-contracta, to the area of the orifice is known as coefficient of contraction. Mathematically coefficient of contraction, The value of Coefficient of contraction varies slightly with the available head of the liquid, size and shape of the orifice.The average value of is 0.64.he theoretical velocity of jet at vena-contracta is given by the relation, , where h is the head of water at vena-contracta. Mathematically coefficient of velocity, The difference between the velocities is due to friction of the orifice.