FLOW MEASUREMENT
EXPERIMENT (4)
FLOW MEASUREMENT
By:
Eng. Motasem M. Abushaban.
Eng. Fedaa M. Fayyad.
PURPOSE:
To study some of the famous instruments used in flow measurements.
The measurement of water flow rate is an important topic in the study of fluid dynamics.
There are many instruments used in flow measurements such as : o Venturi o Orifice plate o Variable area meter
DESCRIPTION OF APPARATUS
Water Flow Measuring Apparatus is designed as a free-standing apparatus for use on the Hydraulics
Bench, although it could be used in conjunction with a low pressure water supply controlled by a valve and a discharge to drain. Water enters the apparatus through the lower left-hand end and flows horizontally through a sudden enlargement into a transparent venturi meter, and into an orifice plate, a 90º elbow changes the flow direction to vertical and connects to a variable area flow meter, a second bend passes the flow into a
discharge
atmospheric break.
pipe
which
incorporates
an
Flow Measurement:
The static head at various points in the flow path may be measured on a manometer panel. The water flow through the apparatus is controlled by the delivery valve of the Hydraulics Bench and the flow rate may be confirmed by using the volumetric measuring tank of the
Hydraulics Bench.
Flow Measurement:
Theory:
1. Sudden Enlargement
The head loss through the sudden enlargement he
V12
he = ke
2g
V1 =
2 ghe
A1
1 −
A2
2
Where : he = h 2 − h 2
Qth = V 1A1
Qactual =
Volume time &
Qact = Cd Qth
Where Cd is the coefficient of discharge.
Flow Measurement:
2. Venturi Meter
The flow through venturi meter can calculated from the following equation
V2 =
2 gH
A2
1−
A1
2
Where : H = h 2 − h1
Qth = V 2A2
Qactual
&
Qact = Cd Qth
Volume
=
time
Where Cd is the coefficient of discharge.
Qact = C d A2
2g
A2
1−
A1
FLOW MEASUREMENT
By:
Eng. Motasem M. Abushaban.
Eng. Fedaa M. Fayyad.
PURPOSE:
To study some of the famous instruments used in flow measurements.
The measurement of water flow rate is an important topic in the study of fluid dynamics.
There are many instruments used in flow measurements such as : o Venturi o Orifice plate o Variable area meter
DESCRIPTION OF APPARATUS
Water Flow Measuring Apparatus is designed as a free-standing apparatus for use on the Hydraulics
Bench, although it could be used in conjunction with a low pressure water supply controlled by a valve and a discharge to drain. Water enters the apparatus through the lower left-hand end and flows horizontally through a sudden enlargement into a transparent venturi meter, and into an orifice plate, a 90º elbow changes the flow direction to vertical and connects to a variable area flow meter, a second bend passes the flow into a
discharge
atmospheric break.
pipe
which
incorporates
an
Flow Measurement:
The static head at various points in the flow path may be measured on a manometer panel. The water flow through the apparatus is controlled by the delivery valve of the Hydraulics Bench and the flow rate may be confirmed by using the volumetric measuring tank of the
Hydraulics Bench.
Flow Measurement:
Theory:
1. Sudden Enlargement
The head loss through the sudden enlargement he
V12
he = ke
2g
V1 =
2 ghe
A1
1 −
A2
2
Where : he = h 2 − h 2
Qth = V 1A1
Qactual =
Volume time &
Qact = Cd Qth
Where Cd is the coefficient of discharge.
Flow Measurement:
2. Venturi Meter
The flow through venturi meter can calculated from the following equation
V2 =
2 gH
A2
1−
A1
2
Where : H = h 2 − h1
Qth = V 2A2
Qactual
&
Qact = Cd Qth
Volume
=
time
Where Cd is the coefficient of discharge.
Qact = C d A2
2g
A2
1−
A1