The rate of flow of a liquid mixture is to be measured continuously. The flow rate will be approximately 40 gpm, and rates as low as 30 gpm or as high as 50 gpm can be expected. An orifice meter, a rotameter, and a venturi meter are available. On the basis of the following additional information, would you recommend installation of the orifice meter, the venturi meter, or the rotameter? Give reasons for your choice.
Density of liquid = 58 lb/ft3
Viscosity of liquid = 1.2 centipoises
Diameter of venturi throat = 1 in.
Upstream diameter of venturi opening = 2 in.
Manometers connected across the venturi and the orifice contain a non-miscible liquid (sp gr = 1.56) in contact with the liquid mixture
The maximum possible reading on these manometers is 15 in.
Orifice is square-edged with throat taps
Diameter of orifice opening = 1 in.
Diameter of upstream chamber for orifice meter = 3 in.
Calibration curve for rotameter is for water at 60°F and gives the following values:
