Problems for Homework 10
Homework 10 is due on Thursday, 23rd April by 10PM.
Graded problems (from Chapter 11)
Q1. A cross-flow heat exchanger consists of 80 thin-walled tubes of 3-cm diameter located in a
duct of 1 m X 1 m cross section. There are no fi
Problems for Homework 12
Homework 12 is due on Thursday, 30th April by 10PM.
Graded problems
Note - In these problems it may help to construct the thermal circuit.
Q1. [Chapter 13] This experiment is conducted to determine the emissivity of a certain
mate
Problems for Homework 9
Homework 9 is due on Thursday, 9th April by 10PM.
Graded problems (from Chapter 9)
Q1. How does the Rayleigh number differ from the Grashof number?
Q2. Consider a thin 24-cm-long and 20-cm-wide horizontal plate suspended in air at
Problems for Homework 11
Homework 11 is due on Thursday, 23rd April by 10PM.
Graded problems
Q1. [Chapter 12] An opaque horizontal plate is well insulated on the edges and the lower
surface. The irradiation on the plate is 3000 W/m2, of which 500 W/m2 is
Problems for Homework 1
The problems are from fourth edition of textbook - Cengel and Ghajar.
A.
B.
C.
D.
E.
1-97*
1-104
2-35*
2-59*
2-64
We will grade only the starred problems. You can do the other two in recitation.
Homework 1 is due on Thursday, 5th F
Problems for Homework 6
Homework 6 is due on Thursday, 19th March by 10PM.
Graded problems
Q1. 1a (posted Scale Analysis discussion)
Q2. 8 (posted Scale Analysis discussion)
Q3. [Chapter 7] Mercury at 25C flows over a 3-m-long and 2-m-wide flat plate main
Problems for Homework 5
Homework 5 is due on Thursday, 5th March by 10PM.
Graded problems (from Chapter 4)
Q1. Hailstones are formed in high altitude clouds at 253 K. Consider a hailstone with diameter of
20 mm and is falling through air at 15C with conv
Problems for Homework 7
Homework 7 is due on Thursday, 19th March by 10PM.
Graded problems (from Chapter 7)
Q1. A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a
10-cm x 6.2-cm-wide polished aluminum heat sink (e
Problems for Homework 4
Homework 4 is due on Thursday, 26th Feb by 10PM.
Graded problems (from Chapter 4)
Q1. In a meat processing plant, 2-cm-thick steaks (k = 0.45 W/mK and = 0.91 10-7 m2/s) that
are initially at 25C are to be cooled by passing them th
Problems for Homework 2
Homework 2 is due on Thursday, 12th Feb by 10PM.
Graded problems
Problem Numbers from 4th edition
Problem Numbers from 5th edition
2-91
3-49
3-65 (construct the thermal conduction network)
3-221
2-90
3-49
3-72
3-210
Clip of the pr
Homework Problem: Application of ANSYS to a transient conduction problem
Due on March 5, 2015
Consider a 20 mm (0.020m) diameter sphere is initially at Ti = 330C. The sphere is suddenly immersed in an
ambience with heat transfer coefficient h=800 W/m2K an
Problems for Homework 3
Homework 3 is due on Thursday, 19th Feb by 10PM.
Graded problems
Q1. A 3-m-diameter spherical tank containing some radioactive material is buried in the ground
(k =1.4 W/mK). The distance between the top surface of the tank and th
7-37 A fan blows air parallel to the passages between the tins of a heat sink attached to a transformer. The minimum free-
stream velocity that the fan should provide to avoid overheating is to be determined
Assumptions 1 Steady operating conditions exist
Homework Problem: Application of ANSYS to a transient conduction problem
Due on March 5, 2015
Consider a 20 mm (0.020m) diameter sphere is initially at Ti = 330C. The sphere is suddenly immersed in an
ambience with heat transfer coefficient h=800 W/m2K an
Problems for Homework 8
Homework 8 is due on Thursday, 26th March by 10PM.
Graded problems (from Chapter 8)
Q1. Determine the hydrodynamic and thermal entry lengths for water, engine oil, and liquid
mercury flowing through a 2.5-cm-diameter smooth tube w