Title: Lab -3 Bernoulli Equation
1 Lab -3 Bernoulli Equation
- General Information
- Worksheet and Spreadsheets due Thursday by 12
noon - Lab Reports due Tuesday by 4.00 pm
2- Objectives
- To investigate the validity of Bernoullis
equation as applied - to a tapering horizontal tube
- To determine if the variations in Static
pressure head can be predicted by Bernoullis
equation for tapering horizontal tube
3Figure1 Test Section and Manometer tubes
4Theory Bernoullis Equation
.(1)
If horizontal tube leveled correctly, then z1
z2, and equation 1 is then simplified to
..(2)
pressure head or static head hs
velocity head hv
Total head hT hs hv
5Assumptions
- Bernoulli made some assumptions for his equation
to work - Inviscid (no shear stress)
- Flow is steady
- Points 1 and 2 which you are comparing are in
the same streamline - Density of the fluid is constant
- System is not accelerating
676.08
55.46
15.8
7.4
2.9
5.0
f
b
c
d
e
a
Tube diameter (mm) a
25.0 b
13.9 c 11.8
d 10.7
e 10.0 f
25.0
7Main Objective Is Bernoullis equation
validated? Why/ Why not?
Any assumptions violated? In the Data
Sheet hsm static head measured and hTm total
head measured Measurement Points
Static probe / Piezometer measures static heads
or pressure heads Pitot Probe total
head
8Analysis
- Determine three flow rates ( High / Medium / Low)
- Calculate the velocity head at each cross section
- Calculate the best estimate of the total head hT
in the tube - Predict the variation of static pressure head hSc
along the length of the tube - Compare measured
static head to calculated static head value - Graph values of hT htm hSm hsc hvc as a
function of position along the tube - Discuss the converging and diverging section and
how the values change within them - Discuss the effect of change in flow rate on
observations - Comment on validity of B.Eq. for convergent and
divergent flows