This section contains endofthechapter problems that involve data obtained from various
simple laboratory experiments. These lab problems for any chapter can be obtained by click
ing on the desired chapter number below. The problem statements involve the objective of
the experiment, the equipment used, the experimental procedure involved, and a discussion
of the calculations necessary to obtain the desired results.
The goal of each problem is to present the final results in graphical form. The raw data
for each problem can be obtained by clicking on the prompt in the data section of the prob
lem statement. These data are then given as a page in the EXCEL program so that the nec
essary calculations and data plotting can be done easily on the computer.
Chapter 1
Chapter 2
Chapter 3
Chapter 5
Chapter 7
Chapter 8
Chapter 9
Chapter 10
L1
L
ab Problems
Lab Problems for Chapter 1
1.90
Fluid Characterization by Use of a Stormer Viscometer
Objective:
As discussed in
Section 1.6,
some fluids can be classified as Newtonian flu
ids; others are nonNewtonian. The purpose of this experiment is to determine the shearing
stress versus rate of strain characteristics of various liquids and, thus, to classify them as
Newtonian or nonNewtonian fluids.
Equipment:
Stormer viscometer containing a stationary outer cylinder and a rotating,
concentric inner cylinder (see
Fig. P1.90
); stop watch; drive weights for the viscometer; three
different liquids (silicone oil, Latex paint, and corn syrup).
■
F I G U R E P 1 . 9 0
Rotating inner cylinder
Drive weight
Outer cylinder
Fluid
ω
W
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Experimental Procedure:
Fill the gap between the inner and outer cylinders with one of
the three fluids to be tested. Select an appropriate drive weight (of mass m) and attach it to the
end of the cord that wraps around the drum to which the inner cylinder is fastened. Release
the brake mechanism to allow the inner cylinder to start to rotate. (The outer cylinder remains
stationary.) After the cylinder has reached its steadystate angular velocity, measure the amount
of time,
t
, that it takes the inner cylinder to rotate
N
revolutions. Repeat the measurements us
ing various drive weights. Repeat the entire procedure for the other fluids to be tested.
Calculations:
For each of the three fluids tested, convert the mass,
m
, of the drive weight
to its weight,
where
g
is the acceleration of gravity. Also determine the angular ve
locity of the inner cylinder,
Graph:
For each fluid tested, plot the drive weight,
W
, as ordinates and angular velocity,
as abscissas. Draw a best fit curve through the data.
Results:
Note that for the flow geometry of this experiment, the weight,
W
, is propor
tional to the shearing stress,
on the inner cylinder. This is true because with constant an
gular velocity, the torque produced by the viscous shear stress on the cylinder is equal to the
torque produced by the weight (weight times the appropriate moment arm). Also, the angu
lar velocity,
is proportional to the rate of strain,
This is true because the velocity
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 Spring '08
 USaxena
 Fluid Dynamics, Experimental Procedure, Hatm

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