DETERMINE THE HEAD LOSSES DUE TO PIPES FITTING AND BENDING
Turbulent pipe flow tends to be very difficult to
quantitatively understand from a purely theoretical standpoint, so experimental
analysis is necessary to place some solid numerical backing behind this theory.
This lab was intended to explore the effects of various flow rates (and
consequently velocity and Reynolds number) on pressure drops through a fixed
diameter pipe system with replaceable joints. This system is illustrated in
Within a pipe system, there are two types of losses. The
first is a Major Loss, and consists of the head losses due to viscous effects
in straight segments of pipe in the system. This will be hereafter referred to
as hL major. The second type is a Minor Loss, and is comprised of losses
generated within components of the pipe system other than the straight pipes
themselves. This will be hereafter referred to as hL minor
Read the barometric pressure prior to conducting
temperature of the ambient air
Record each of the
dimensions listed in Figure
measure the ID of the pipe system, and calculate the area from this value.
heights, h, on a manometer necessary to achieve a Re value of 15000, 25000, and
35000 through the pipe system.
Activate the manometer 1 hour prior to testing
position the yellow dump valve so that the handle is
parallel to the pipe it is attached to (this is fully open)
Press the green start button to begin running the
supply fan and air conditioner
Calibrate the thermostat at the flow bench to match
the temperature recorded previously
Set the “multipoint” selector switch set to position
“1”, and verify that the temperature displayed on the thermostat still agrees
with the ambient reading.
Calibration of Instruments and Pipe Flow rate
To zero the
the three position filter switch to “OFF”
the scale knob to position “X1”
the zeroing knob to adjust manometer until it reads 0.
three position filter switch from “OFF” to “HI”
Pipe A: 90 Degree Elbow Fitting
Adjust flow until the manometer reads the height that
corresponds to Re = 15000
Set the knob labeled “HP”, the high pressure source, to “PIPE
Set the knob labeled “LP” , the low pressure source, to
Verify that the position of the handle on the ball valve
for pipe A is parallel to the pipe (fully open), and that the handle on pipe B
is perpendicular to the pipe (fully closed).