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Unformatted text preview: f liquid or gas passing through a duct. The different devices available to make these
measurements are discussed in great detail in the ASME text on fluid meters . These
devices split into two classes: mechanical instruments and head-loss instruments.
The mechanical instruments measure actual mass or volume of fluid by trapping it
and counting it. The various types of measurement are
1. Mass measurement
a. Weighing tanks
b. Tilting traps
2. Volume measurement
a. Volume tanks
b. Reciprocating pistons
c. Rotating slotted rings
d. Nutating disk
e. Sliding vanes
f. Gear or lobed impellers
g. Reciprocating bellows
h. Sealed-drum compartments
The last three of these are suitable for gas flow measurement.
The head-loss devices obstruct the flow and cause a pressure drop which is a measure of flux:
1. Bernoulli-type devices
a. Thin-plate orifice
b. Flow nozzle
c. Venturi tube
2. Friction-loss devices
a. Capillary tube
b. Porous plug
The friction-loss meters cause a large nonrecoverable head loss and obstruct the flow
too much to be generally use...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.
- Spring '08