MEEN 345 EXAM 1- 2 QUESTIONS AND VERIFIED
ANSWERS
Which of the following is not the objectives of Lab 1(fluid viscosity and viscometers)?
a) measure the viscosity of fluid using a rotary viscometer
b) determine the temperature dependence of fluid viscosity
c) determine the pressure dependence of fluid viscosity
d) classify the fluids and newtonian or non-newtonian fluid - Answers - c) determine the
pressure dependence of fluid viscosity
You are given experimental data below measured by a Cole Parmer rotary viscometer.
Although the fluid is unknown, you can classify the fluids as Newtonian, shear
thickening, and/or shear thinning. Please classify each fluid. (LAB 1)
Fluid A = exponential decay
Fluid B = exponential growth
Fluid C = Linear horizontal line - Answers - Fluid A: Shear thinning
Fluid B: Shear thickening
Fluid C: Newtonian fluid
When temperature of the oil increases, the distance between the molecules in the oil
increases and the cohesive force decreases. Therefore, the viscosity of oil increases as
the temperature of the oil increases. (LAB 1) - Answers - False
Which of the following fluids will be tested in this lab? Select all that apply (LAB 1)
- motor oil
- water
- ketchup
- coolant - Answers - motor oil
ketchup
For non-newtonian fluids, the viscosity of the fluids do NOT vary with temperature (true
or false)? - Answers - false
Which of the following fluids can be classified as shear thickening fluid? - Answers -
cornstarch in water
which of the following fluids can be classified as non newtonian? - Answers - blood
You took 3 trials of viscosity measurement of 10W40 motor oil at low temperatures to
produce the data below. Calculate the boundary layer thickness (h) using the averages
of your trials. Dd=18.75mm (LAB 1) - Answers - 1.51mm
, Perform a Kline-McClintock uncertainty analysis on the pump power calculation. What is
the uncertainty of the pump power measurement in watt? (LAB 1) - Answers - 200
Which of the following is not an objective of Flow Visualization lab? (LAB 2)
a) To verify the law of mass conservation along the channel
b) To visualize the flow patterns of a liquid by the injection of dye
c) To determine the drag force experienced by various objects placed in a water flow
d) To characterize and identify pathlines, streamlines, streamlines and various flow
features - Answers - c) to determine the drag force experienced by various objects
placed in a water flow
Water flows over a rectangular body in Laminar Flow Table. Four points or regions have
been labeled in the figure below. Match the flow features given in the list to those
points/regions. (LAB 2)
(dye running from left to right)
Point A = below rectangle
Point B = top left corner of rectangle
Point C = middle of rectangle on left side
Point D = middle of rectangle on right side
choices: stagnation point, laminar flow region, wake region, flow separation region -
Answers - A: Laminar flow region
B: Flow separation region
C: Stagnation point
D: Wake region
The flow patterns can be visualized in different ways. Match the terms to the correct
descriptions. (LAB 2)
Streamlines
Streaklines
Pathlines
Timelines
A) A curve that is everywhere tangent to the velocity vector at a given instant
B) The locus of all particles that have passed through a given point during a time
interval
C) A set of adjacent fluid particles that form a line at a given instant
D) The path taken by individual particles of the fluid as they travel from point to point -
Answers - Streamlines- A
Streaklines- B
Pathlines- D
Timelines- C
Water flows through the converging rectangular channel as shown below. It took 5
seconds for dye particles to travel from A-B. The density of water is approximately 1000
kg/m3. What is the mass flow rate of water per depth (into the screen) of the channel at
narrow gap region? Assume the velocity is uniform over a cross section of the channel
ANSWERS
Which of the following is not the objectives of Lab 1(fluid viscosity and viscometers)?
a) measure the viscosity of fluid using a rotary viscometer
b) determine the temperature dependence of fluid viscosity
c) determine the pressure dependence of fluid viscosity
d) classify the fluids and newtonian or non-newtonian fluid - Answers - c) determine the
pressure dependence of fluid viscosity
You are given experimental data below measured by a Cole Parmer rotary viscometer.
Although the fluid is unknown, you can classify the fluids as Newtonian, shear
thickening, and/or shear thinning. Please classify each fluid. (LAB 1)
Fluid A = exponential decay
Fluid B = exponential growth
Fluid C = Linear horizontal line - Answers - Fluid A: Shear thinning
Fluid B: Shear thickening
Fluid C: Newtonian fluid
When temperature of the oil increases, the distance between the molecules in the oil
increases and the cohesive force decreases. Therefore, the viscosity of oil increases as
the temperature of the oil increases. (LAB 1) - Answers - False
Which of the following fluids will be tested in this lab? Select all that apply (LAB 1)
- motor oil
- water
- ketchup
- coolant - Answers - motor oil
ketchup
For non-newtonian fluids, the viscosity of the fluids do NOT vary with temperature (true
or false)? - Answers - false
Which of the following fluids can be classified as shear thickening fluid? - Answers -
cornstarch in water
which of the following fluids can be classified as non newtonian? - Answers - blood
You took 3 trials of viscosity measurement of 10W40 motor oil at low temperatures to
produce the data below. Calculate the boundary layer thickness (h) using the averages
of your trials. Dd=18.75mm (LAB 1) - Answers - 1.51mm
, Perform a Kline-McClintock uncertainty analysis on the pump power calculation. What is
the uncertainty of the pump power measurement in watt? (LAB 1) - Answers - 200
Which of the following is not an objective of Flow Visualization lab? (LAB 2)
a) To verify the law of mass conservation along the channel
b) To visualize the flow patterns of a liquid by the injection of dye
c) To determine the drag force experienced by various objects placed in a water flow
d) To characterize and identify pathlines, streamlines, streamlines and various flow
features - Answers - c) to determine the drag force experienced by various objects
placed in a water flow
Water flows over a rectangular body in Laminar Flow Table. Four points or regions have
been labeled in the figure below. Match the flow features given in the list to those
points/regions. (LAB 2)
(dye running from left to right)
Point A = below rectangle
Point B = top left corner of rectangle
Point C = middle of rectangle on left side
Point D = middle of rectangle on right side
choices: stagnation point, laminar flow region, wake region, flow separation region -
Answers - A: Laminar flow region
B: Flow separation region
C: Stagnation point
D: Wake region
The flow patterns can be visualized in different ways. Match the terms to the correct
descriptions. (LAB 2)
Streamlines
Streaklines
Pathlines
Timelines
A) A curve that is everywhere tangent to the velocity vector at a given instant
B) The locus of all particles that have passed through a given point during a time
interval
C) A set of adjacent fluid particles that form a line at a given instant
D) The path taken by individual particles of the fluid as they travel from point to point -
Answers - Streamlines- A
Streaklines- B
Pathlines- D
Timelines- C
Water flows through the converging rectangular channel as shown below. It took 5
seconds for dye particles to travel from A-B. The density of water is approximately 1000
kg/m3. What is the mass flow rate of water per depth (into the screen) of the channel at
narrow gap region? Assume the velocity is uniform over a cross section of the channel
