Lab 6 - Venturi and Orifice Meters Flashcards
What is a pipe?
a closed conduit that carries fluid.
What is a venturi meter?
a gradual contraction followed by a gradual expansion. The velocity increases in the narrow part of the meter, thus causing a pressure drop between the entrance
and the middle.
What is an orifice?
creates losses larger than those in the pipe
thus also causing a pressure drop
What is the purpose of this lab?
determine the characteristics of venturi and orifice meters.
When did J.B. Venturi present his Venturi Principle?
1979
Describe the diameter of the throat pipe for the venturi meter.
The diameter of the throat is normally between one-half and one-fourth of the diameter of the entrance pipe
Contraction coefficient, C_c for orifice meter
.62
Coefficient of velocity C_v
.98
Coefficient of discharge for orifice meter
C_v(C_c)
Reynolds numbers the venturi and orifice meters can investigate.
10^3 to 10^5, covering laminar, transitional and turbulent flow regimes
What are the pipe diameters for the venturi meter
The upstream and downstream parts of the pipe are 24 mm in diameter, and the venturi meter has a 14 mm throat
Orifice meter pipe diameters
24 mm diameter pipe with a sharp-edged orifice plate with diameter of 20 mm.
What number is the venturi meter on the apparatus?
18
What number is the orifice meter on the apparatus?
19
