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A long hollow cylinder has an inner radius of 1.5 in. and an outer radius of 2.5 in. The temperature of the inner surfac 150°F and the outer surface is at 110°F. The thermal conductivity of the material can be represented by: k(Btu/h ft °F) = 0.1 +0.001 T(°F) (a) Find the steady-state heat flux in the radial direction: (i) At the inner surface (ii) At the outer surface (b) Calculate the thermal resistance for a 1 ft length of the cylinder. Ans: (a) 144 1 Btu/h ft² 864 Btu/h ft² (b) 0 3535 h.°F/Btu

A long hollow cylinder has an inner radius of 1.5 in. and an outer radius of 2.5 in. The temperature of the inner surfac 150°F and the outer surface is at 110°F. The thermal conductivity of the material can be represented by: k(Btu/h ft °F) = 0.1 +0.001 T(°F) (a) Find the steady-state heat flux in the radial direction: (i) At the inner surface (ii) At the outer surface (b) Calculate the thermal resistance for a 1 ft length of the cylinder. Ans: (a) 144 1 Btu/h ft² 864 Btu/h ft² (b) 0 3535 h.°F/Btu

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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(1.5) A long hollow cylinder has an inner radius of 1.5 in. and an outer radius of 2.5 in. The temperature of the inner surface 150°F and the outer surface is at 110°F. The thermal conductivity of the material can be represented by: k(Btu/h ft.°F) = = 0.1 +0.001 T(°F) (a) Find the steady-state heat flux in the radial direction: (i) At the inner surface (ii) At the outer surface (b) Calculate the thermal resistance for a 1 ft length of the cylinder. . Ans: (a) 144.1 Btu/h ft², 86.4 Btu/h ft², (b) 0.3535 h·ºl •°F/Btu. .
Transcribed Image Text:(1.5) A long hollow cylinder has an inner radius of 1.5 in. and an outer radius of 2.5 in. The temperature of the inner surface 150°F and the outer surface is at 110°F. The thermal conductivity of the material can be represented by: k(Btu/h ft.°F) = = 0.1 +0.001 T(°F) (a) Find the steady-state heat flux in the radial direction: (i) At the inner surface (ii) At the outer surface (b) Calculate the thermal resistance for a 1 ft length of the cylinder. . Ans: (a) 144.1 Btu/h ft², 86.4 Btu/h ft², (b) 0.3535 h·ºl •°F/Btu. .
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