CHBE3521: 2014F
hw1.pdf
Problem
1. A furnace wall consists of three layers: (i) a layer of heat-resistant or refractory brick, (ii) a
layer of insulating brick, and (iii) a steel plate, 0.25 in. thick, for mechanical protection.
x0
Steel
Insulating brick

CBE3521: 2014F
2014 Midterm1.pdf
Remarks
To be taken with closed book and closed notes.
One hand-written cheat sheet is allowed. (Letter size, double sided.)
No calculator is allowed.
Submit only the exam book. You can keep the exam problem and the ch

CBE3521: 2014F
2013 Midterm1.pdf
Remarks
To be taken with closed book and closed notes.
One hand-written cheat sheet is allowed. (Letter size, double sided)
No calculator is allowed.
Submit only the exam book. You can keep the exam problem and the che

HW 8
CBE3521: 2014F
Problem
1. [Oxygen stripping (Problem 22B.5)]
Calculate the rate at which oxygen transfers from quiescent oxygen saturated water at 20 C
(and 1atm) to a bubble of pure nitrogen 1mm in diameter, if the bubble acts as a rigid
sphere.1 Fi

HW 7
CBE3521: 2014F
Problem
1. [Chlorine absorption in a falling lm (Problem 18A.4)]
z
water lm
water lm
Surface concentration assumed equal
to the saturation concentration
r
Chlorine is being absorbed from a gas in a
small experimental wetted-wall towe

HW 6
CBE3521: 2014F
Problem
1. From the discussion on heat exchangers in class, we have the following ve equations:
II
II dT
II C p
dz
= 2R0 qr |r=R0 ,
II
II C p [T II (L) T II (0)] = Q,
I
I dT
I C p
dz
= 2R0 qr |r=R0 ,
I
I C p [T I (L) T I (0)] = Q

HW 5
CBE3521: 2014F
Problem
You will need equations from Nusselt1.pdf to solve Problems 1 and 2.
1. [BSL: Problem 14A.2 with minor modications.] Oil at 100 F is owing through a 1.0in inner
diameter copper tube that is 20ft long at the ow rate of 100 lbm /

CBE3521: 2014F
HW 4
Problem
1. Show that
d
dt
(x, t)
(x, t)S(x, t)dV =
Vm (t)
Vm (t)
DS(x, t)
dV,
Dt
where is the density, S is a (dierentiable) scalar valued function.
2. This problem is about viscous heating. An incompressible Newtonian uid of constant

HW 3
CBE3521: 2014F
Problem
1. Using MATLAB, solve the dierential equation from HW2, Problem 1 numerically and compare your results against the analytical one. They should agree. Lets use the following values:
T1 = 300 F, Ta = 60 F, h = 0.06 Btu/hr ft2 F,

HW 2
CHBE3521: 2014F
Problem
1. A circular n of thickness d and radius R2 is mounted on a pipe with outside radius R1 and
outside wall temperature T1 . The outer edge of the n is coated with an insulating material,
but its broad washer-shaped faces are ex