Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 3, Problem 3.10P
A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is
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Ground turkey was made
into me
at balls and refrigerated at 2
°
C before being deep fried. The
diameter of each meat ball is 9cm. To make sure that the meat balls are safe to be consumed,
they must be cooked over 70
°
C. Assume that the cooking oil is at a constant temperature of 180
°
C and has a heat transfer coefficient of 50
W/(m
2
∙
K). The conductivity and specific heat of the
ground turkey are approximated at 2 W/(
m∙K
) and 4 kJ/(
kg
∙
K)
respectively. The density of the
ground turkey is 500kg/
m
3
.
a)
During the deep-
frying process, do you anticipate that each meat ball has
a uniform
temperature distribution throughout its volume? Please show
calculation
to support your
answer
(5
pts)
.
b)
Please calculate the minimum time required for cooking
(1
5 p
ts).
c)
When served, what are the surface and center temperatures of each meat ball (
15 pts).
A steam is flowing through a 5.7 m long of steel tube that has inner and outer radii of r, = 0.015 and r, 0,024 m, and a thermal
conductivity of 0.14 W/m.K. The steam and the outer surface of the tube is maintained at constant temperature of 150 °C and the air
= 25 °C, h = 0.35 W/m2.k) is surrounding the tube. To prevent the outer surface of the steel from the environmental conditions, a
material that has a thermal conductivity of 0.014 W/m.k is wrapped over the outer surface of the steel. What is the maximum heat
transfer from the steam to the air (W)?
NOTE: Enter your answer.
Answer
Air
Th
Steam
Steel Tr
111
To
A spherical pellet (ρ =1000 kg/m3 , c = 1000 J/(kg⋅K)) with a radius ro = 1 cm is cooled from an initial temperature of 200°C by immersion in water bath at 10°C with a convection coefficient h = 100 W/(m2 K). Evaluate the temperature in the center and on the surface of the pellet after 10 s of immersion for two cases:
(a) Thermal conductivity of the pellet k = 0.1 W/(m⋅K)
(b) Thermal conductivity of the pellet k = 5 W/(m⋅K)
Chapter 3 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 3 - Consider a flat plate or a plane wall with a...Ch. 3 - 3.2 High-strength steel is required for use in...Ch. 3 - Prob. 3.3PCh. 3 - 3.5 In a ball-bearing production facility, steel...Ch. 3 - A 0.6-cm diameter mild steel rod at 38C is...Ch. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - 3.9 The heat transfer coefficients for the flow of...Ch. 3 - 3.10 A spherical shell satellite (3-m-OD,...Ch. 3 - Prob. 3.11P
Ch. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - 3.14 A thin-wall cylindrical vessel (1 m in...Ch. 3 - A thin-wall jacketed tank heated by condensing...Ch. 3 - 3.16 A large, 2.54-cm.-thick copper plate is...Ch. 3 - 3.17 A 1.4-kg aluminum household iron has a 500-W...Ch. 3 -
3.28 A long wooden rod at with a 2.5-cm-OD is...Ch. 3 - A mild-steel cylindrical billet 25 cm in diameter...Ch. 3 - Prob. 3.37PCh. 3 -
3.38 An egg, which for the purposes of this...
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