4.26 How long must a 0.4 cm cylindrical copper fin be if the temperature of its insulated tip is to exceed the surrounding air temperature by 20% of (To-To)? Consider Tair 20°C and h = 28 W/m²K. [27.3 cm]
4.26 How long must a 0.4 cm cylindrical copper fin be if the temperature of its insulated tip is to exceed the surrounding air temperature by 20% of (To-To)? Consider Tair 20°C and h = 28 W/m²K. [27.3 cm]
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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4.26 please
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Chapter 5.)
4.25 A 6061-T6 aluminum steam condenser tube has a 20 mm O.D. with
an array of fins on its outer surface. The fins are 0.8 mm thick
with a diameter of 35 mm and a center-to-center spacing of 5 mm.
The steam inside is at 10 atm and the air and room outside are
at 18°C, with an effective houtside = 6 W/m²K. The heat transfer
coefficient for condensation is very large and the tube wall is not
thick. What is the mass rate of condensation if the pipe is 1.5 m in
length? [m cond 0.802 kg/hr.]
4.26 How long must a 0.4 cm cylindrical copper fin be if the temperature
of its insulated tip is to exceed the surrounding air temperature
by 20% of (To-To)? Consider Tair 20°C and h = 28 W/m²K.
[27.3 cm]
2010
4.27 A 2 cm ice cube sits on a shelf of widely spaced aluminum rods, 3
mm in diameter, in a refrigerator at 10°C. How rapidly, in mm/min,
do the rods melt their way through the ice cube if h at the surface
of the rods is 10 W/m²K (including both convection and radiation).
Be sure that you understand the physical mechanism before you](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0faa0630-92f0-4653-b84e-0d22ebfc40eb%2Fed3e9c1c-2d79-4946-bdbc-75e0d2827eef%2F068yiga_processed.jpeg&w=3840&q=75)
Transcribed Image Text:20
00
as or
Chapter 5.)
4.25 A 6061-T6 aluminum steam condenser tube has a 20 mm O.D. with
an array of fins on its outer surface. The fins are 0.8 mm thick
with a diameter of 35 mm and a center-to-center spacing of 5 mm.
The steam inside is at 10 atm and the air and room outside are
at 18°C, with an effective houtside = 6 W/m²K. The heat transfer
coefficient for condensation is very large and the tube wall is not
thick. What is the mass rate of condensation if the pipe is 1.5 m in
length? [m cond 0.802 kg/hr.]
4.26 How long must a 0.4 cm cylindrical copper fin be if the temperature
of its insulated tip is to exceed the surrounding air temperature
by 20% of (To-To)? Consider Tair 20°C and h = 28 W/m²K.
[27.3 cm]
2010
4.27 A 2 cm ice cube sits on a shelf of widely spaced aluminum rods, 3
mm in diameter, in a refrigerator at 10°C. How rapidly, in mm/min,
do the rods melt their way through the ice cube if h at the surface
of the rods is 10 W/m²K (including both convection and radiation).
Be sure that you understand the physical mechanism before you
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