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ENGR30002 – Fluid Mechanics
Online open-book strict-time-limit exam and submission via Canvas Quiz
This paper has 15 pages including this page, the exam and the supplementary material.
Timing
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other person via any means about the content of this exam during the examination
time. If another student contacts you during the examination period, please inform
the subject coordinator immediately.
Alternative Exam Arrangements (AEAs) time settings may vary from the above.
This exam will be conducted in an online open-book format and the following materials
are permitted:
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ENGR30002 2020 Page 2 of 15
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exam must be in your own words and not directly copied from lecture notes, tutorial
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• You will have only one attempt at completing this online exam.
• The recommended browser for this exam is Google Chrome.
• Total marks for this paper are [120].
• For this remotely conducted exam, you may write answers during reading time.
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• Attempt all 7 questions, which are of unequal value.
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ENGR30002 2020 Page 3 of 15
Question 1 [22 marks]
Briefly answer the following questions.
A. Consider two pipes, one 0.5m in diameter and another that is 1m in diameter with a small but
non-zero surface roughness. The flow in both is turbulent, and has the same flow rate in both
cases.
a) Which of these will have a higher friction factor? The smaller diameter pipe or the larger
diameter pipe?
b) Over a given length of pipe, which one of these will have a greater proportion of energy that
is lost due to friction? The smaller diameter pipe or the larger diameter pipe?
[2 marks]
B. What are the SI units for each of these terms in the following equation?
[2 marks]
C. What are the SI units for each of these terms in the following equation?
[3 marks]
D. For each of these equations, write whether they are most appropriate for (1) Newtonian fluids,
(2) Shear-thinning fluids, (3) Shear-thickening fluids or (4) Bingham plastics.
a) || = + |
|
, || >
b) = −
c) || = |
|
, < 1
d) || = |
|
, > 1
[4 marks]
Question continued on next page
ENGR30002 2020 Page 5 of 15
E. Which of these parameters will remain constant along the length of a constant diameter pipe in
steady state compressible flow?
a) velocity
b) density
c) mass flow rate
d) pressure
[2 marks]
F. We have a pump moving fluid from a tank. Describe in a few sentences how to find this system’s
operating point.
[3 marks]
G. What is the equivalent hydraulic diameter (in m) of the trapezoid below?
[3 marks]
H. Examine the following figure and state whether each of the following statements (a to f) are true
or false. Path A and Path B start at the point where these paths branch off. The walls have a
finite roughness value (in mm) that is identical for both paths.
a) The frictional losses along path A are greater than along path B.
b) The flow rate along path A is less than the flow rate along path B.
c) If flow along path B is turbulent then flow along path A will always be laminar.
d) The pressure at the start of path A must be greater than the pressure at the start of path B.
e) The fluid velocities are identical in path A and path B
f) If both flows in A and B are turbulent, the fanning friction factor will be greater for path A
than path B
[3 marks]
