1. Title: AIR FLOW RATE AND MANOMETER READING
BACKGROUND:
Manometers:
Pressure measuring devices using liquid columns in vertical or inclined tubes are
called manometers. One of the most common is the water filled U-tube manometer
used to measure pressure difference in pitot or orifices located in the airflow in air
handling or ventilation system.
h
Vertical U-tube manometer:
P = pressure difference
γ = specific weight of fluid in the tube
h = liquid height
Inclined U-tube manometer:
h
0
2. θ = angle of column relative to the horizontal plane
Volume Flow Rate:
Volume flow rate describes the volume of fluid which passes through a given surface
per unit time.
A = cross sectional area
v = velocity of fluid
Fluid velocity:
P = pressure difference
γ = specific weight of air
Air flow bench:
Schematic diagram of an air flow bench is shown below:
OUT
Motor Air duct
IN
Centrifugal
fan
Manometer
3. EQUIPMENTS:
1. Hand held anemometer
2. Air flow bench
3. Caliper
The air flow bench:
Manometers:
