HEAT+MASS TRANSFER:FUND..(LL)-W/CONNECT
6th Edition
ISBN: 9781260699326
Author: CENGEL
Publisher: MCG
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Textbook Question
Chapter 2, Problem 1CP
How does transient heat transfer from steady heat transfer? How does one-dimensional heat transfer differ from two-dimensional heat transfer?
Expert Solution & Answer
To determine
The factor through which the transient heat transfer differs from a steady heat transfer.
The factor through which one-dimensional heat transfer differs from two-dimensional heat transfer.
Explanation of Solution
Heat transfer is classified as follows:
- Steady state heat transfer
- Transient state heat transfer
The steady state means a situation which is independent from time. Insteady state, the heat flux does not depend on time. Whereas, in transient heat transfer, the heat flux depends on the time. During the transient heat transfer the temperature of the medium varies with time and position both. The transient state heat transfer is also known as unsteady state heat transfer.
The heart transfer depends on the rate of heat transfer and direction. It classified as follows:
- One dimensional
- Two dimensional
- Three dimensional
In one-dimensional heat transfer the temperature variation takes place in only one direction and most of the heat transfer occurs in only one direction. While in case of two dimensional heat transfer the temperature variation takes place in two directions and the heat transfer flows in both directions.
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Question 2
You are an engineer working in the propulsion team for a supersonic civil transport
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engine intake and the exhaust nozzle, indicated in Figure Q2a. The turbojet engine can
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the engine has a circular cross section.
(a)
← intake
normal
shock
472 m/s
A B
(b)
50 m/s
H
472 m/s
B
engine
altitude: 14,000 m
exhaust nozzle
E
F
exit to
atmosphere
diameter: DE = 0.30 m
E
F
diameter: DF = 0.66 m
Figure Q2: Propulsion system for a supersonic aircraft.
a) When the aircraft is at an altitude of 14,000 m, use the International Standard
Atmosphere in the Module Data Book to state the local air pressure and tempera-
ture. Thus show that the aircraft speed…
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or in wake, and the top edge of
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Plot the displacement diagram for a cam with roller follower of diameter 10 mm. The required
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1- Rising 60 mm in 135° with uniform acceleration and retardation motion.
2- Dwell 90°
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Then design the cam profile to give the above displacement diagram if the minimum circle
diameter of the cam is 50 mm.
=--20125
7357
750 X 2.01
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Chapter 2 Solutions
HEAT+MASS TRANSFER:FUND..(LL)-W/CONNECT
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