Homework # 8
Due: Friday, November 5, beginning of class.
06-323 Heat and Mass Transfer
1. An Arnold cell is partially filled with liquid toluene at 298K and atmospheric pressure. The
cell has a cross sectional area of 0.8 cm2, a liquid depth of 3 cm, and

06-323 Final Exam 2011
Name:_
1. Multiple choice (21 points total; 3 per question)
Please circle the correct answers on this sheet. Make sure your name is on this
sheet. There is only one correct choice per question.
2.1
/8 Scoring
1.1
Over the temperatur

Homework #1
Due: Friday, August 31, beginning of class
06-323 Heat and Mass Transfer
Math
1. Rewrite the following vector equations as systems of differential equations:
1a)
(in Cartesian coordinates; where k and A are constant)
1b)
(in cylindrical coordi

Homework #2
Due: Friday, September 7, beginning of class
06-323 Heat and Mass Transfer
1. In lecture on August 29, we found an expression for the thermal conductivity of a dilute,
monatomic gas. Using this expression:
1a. Plot the k values for both hydrog

Homework #3
Due: Friday, September 14, beginning of class
06-323 Heat and Mass Transfer
1. A firefighters protective clothing, referred to as a turnout coat, is typically constructed as an
ensemble of three layers separated by air gaps. The air gaps are a

Homework #4
Due: Friday, September 21 beginning of class
06-323 Heat and Mass Transfer
1. Electrical current passing through a flat plate (thickness 2L) made of a particular material
generates heat in a temperature-dependent way. The internal
energy gener

Homework #5
Due: Friday, September 28 beginning of class
06-323 Heat and Mass Transfer
1. Water is flowing inside a horizontal 1 in. Schedule 40 steel pipe at 37.8C and a
velocity of 1.52 m/s. Steam at 108.3C is condensing on the outside of the pipe wall

Homework #7
06-323 Heat & Mass Transfer
Due: Friday October 12th, beginning of class
1. A water main is buried in soil initially at 22C when the surface is suddenly subjected to a
constant temperature of -10C for 60 days.
1a) Calculate and plot the temper

Homework #8
06-323 Heat & Mass Transfer
Due: Friday October 26th, beginning of class
1. A truck travels at 25 mph through air at 70F. The oil pan of the engine extends below the
front end of the cab. The bottom of the oil pan is essentially a flat plate t

Homework #9
06-323 Heat & Mass Transfer
Due: Friday November 2nd, beginning of class
1. A binary mixture of methane and hydrogen gas is contained in a tube at 101.32 kPa and 273
K. The tube connects two large, well-mixed gas reservoirs of A and B. At one

Homework #10
06-323 Heat & Mass Transfer
Due: Friday November 9th, beginning of class
1. A steady-state Arnold diffusion cell is used to determine the diffusion coefficient of
methanol in air at T = 298K and P = 1.013 x 105 Pa. The cell has a 0.80 cm2 cro

Homework #11
06-323 Heat & Mass Transfer
Due: Friday November 16th, beginning of class
1. A latex balloon is filled with 100% helium and is under 2.5 atm of pressure. The wall of the
balloon is 1 mm thick with a surface area of 0.5 m2 and you can neglect

Homework #6
06-323 Heat & Mass Transfer
Due: Friday October 5th, beginning of class
1. The heat transfer coefficient of air flowing over an object can be determined by observing
the temperature history as a function of time of the object. Consider a spher

Homework #12
06-323 Heat and Mass Transfer
Due: Friday, November 30, by the beginning of class
1. At an industrial facility, it was discovered that a large outdoor tank of benzene had been
leaking for one month directly onto the soil beneath it. There had

Homework #7
Due: Friday October 28th, beginning of class
06-323 Heat & Mass Transfer
1. A water main is buried in soil initially at 22C when the surface is suddenly subjected to a
constant temperature of -10C for 60 days.
a) Calculate and plot the tempera

Appendix A
Transformations of the
Operators V and V2 to
Cylindrical Coordinates
THE OPERATOR V IN CYLINDRICAL COORDINATES
In Cartesian coordinates, V is written as
8 + e 8 + e 8
8x y 0y z (32
When transforming this operator into cy

Homework #5
Due: Friday October 7th, beginning of class
06-323 Heat & Mass Transfer
1. In biological heat transfer, it is a well-known fact that the body pumps blood to the head in
order to maintain its temperature at 37C.
a) On a cold day, when the air i

Homework #8
Due: Friday November 4th, beginning of class
06-323 Heat & Mass Transfer
1. For atmospheric pressure and temperature (300 K) determine the following for a 10m3
enclosure filled with liquefied natural gas (LNG) with the following composition:
a

06-323 Heat & Mass Transfer
Fall 2015 Exam I
Name:_
1. Short Qualitative Answers [5 pts. each; 10 pts. total]
1.1
Is the thermal conductivity a stronger or weaker function of temperature for a gas
than a liquid? Explain.
Conductivity can be derived from t

Homework #10
Due: Friday November 18th, beginning of class
06-323 Heat & Mass Transfer
1. Determine the diffusion coefficients for the following scenarios:
a) Bovine serum albumin, a protein, in water at dilute concentrations and room temperature.
The kno