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In a manufacturing process, long aluminum rods of square cross section with d = 27 mm are cooled from an initial temperature of T₁ = 400°C. V.T (a) Configuration (a) should be used to minimize cooling time. (b) Tsur Which configuration (a or b) in the sketch should be used to minimize the time needed for the rods to reach a safe-to-handle temperature of 60°C when exposed to air in cross flow at V = 8 m/s, T = 30°C? What is the required cooling time, in s, for the preferred configuration? The emissivity of the rods is & = 0.10 and the surroundings temperature is Tsur = 20°C. Evaluate the properties of the air at 400 K and the properties of the aluminum at 500 K. Radiation can be neglected in a calculation of the cooling time.

In a manufacturing process, long aluminum rods of square cross section with d = 27 mm are cooled from an initial temperature of T₁ = 400°C. V.T (a) Configuration (a) should be used to minimize cooling time. (b) Tsur Which configuration (a or b) in the sketch should be used to minimize the time needed for the rods to reach a safe-to-handle temperature of 60°C when exposed to air in cross flow at V = 8 m/s, T = 30°C? What is the required cooling time, in s, for the preferred configuration? The emissivity of the rods is & = 0.10 and the surroundings temperature is Tsur = 20°C. Evaluate the properties of the air at 400 K and the properties of the aluminum at 500 K. Radiation can be neglected in a calculation of the cooling time.

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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In a manufacturing process, long aluminum rods of square cross section with d = 27 mm are cooled from an initial temperature of Ti = 400°C. V, T (a) Configuration (a) should be used to minimize cooling time. (b) d Which configuration (a or b) in the sketch should be used to minimize the time needed for the rods to reach a safe-to-handle temperature of 60°C when exposed to air in cross flow at V = 8 m/s, T 30°C? What is the required cooling time, in s, for the preferred configuration? The emissivity of the rods is & = 0.10 and the surroundings temperature is Tsur = 20°C. Evaluate the properties of the air at 400 K and the properties of the aluminum at 500 K. Radiation can be neglected in a calculation of the cooling time. I sur =
Transcribed Image Text:In a manufacturing process, long aluminum rods of square cross section with d = 27 mm are cooled from an initial temperature of Ti = 400°C. V, T (a) Configuration (a) should be used to minimize cooling time. (b) d Which configuration (a or b) in the sketch should be used to minimize the time needed for the rods to reach a safe-to-handle temperature of 60°C when exposed to air in cross flow at V = 8 m/s, T 30°C? What is the required cooling time, in s, for the preferred configuration? The emissivity of the rods is & = 0.10 and the surroundings temperature is Tsur = 20°C. Evaluate the properties of the air at 400 K and the properties of the aluminum at 500 K. Radiation can be neglected in a calculation of the cooling time. I sur =
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