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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
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
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
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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