An Experimental and Theoretical Investigation of Conic Entrance Orifice Performance in the Low Reynolds Number Domain
Research and development rept.
NAVAL SHIP ENGINEERING CENTER PHILADELPHIA PA PHILADELPHIA DIV
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A constant discharge coefficient Cd, relating flow rate to the square root of the differential pressure across a primary element, is a desirable characteristic of any flow sensor to be used in shipboard automatic control systems. Although the simple, square edged orifice meets this criterion for turbulent flows, Cd does not remain constant for applications in the laminar and transitional regions of pipe Reynolds number ReD. In a quest for a device which exhibits both simplicity and constant Cd at low ReD, twelve conic entrance orifice plates were tested.
- Marine Engineering