T = 20°C B (rough) L = 0.5m

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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The top surface of a heated compartment consists of very smooth (A) and highly roughened (B) portions, and the surface is placed in an
atmospheric airstream.
h =
U
To = 20°C
W/m².K
A
(smooth)
B
(rough)
Ts = 100°C
Given Ts = 100°C, T = 20°C, u =
14 m/s, and L = 0.5 m, calculate the value of the average heat transfer coefficient, in
W/m².K, for the plate when half consists of a very smooth portion (A) and the other half consists of a highly roughened portion (B), as
shown in the diagram. Assume the critical Reynolds number is 5 x 105.
L = 0.5m
Transcribed Image Text:The top surface of a heated compartment consists of very smooth (A) and highly roughened (B) portions, and the surface is placed in an atmospheric airstream. h = U To = 20°C W/m².K A (smooth) B (rough) Ts = 100°C Given Ts = 100°C, T = 20°C, u = 14 m/s, and L = 0.5 m, calculate the value of the average heat transfer coefficient, in W/m².K, for the plate when half consists of a very smooth portion (A) and the other half consists of a highly roughened portion (B), as shown in the diagram. Assume the critical Reynolds number is 5 x 105. L = 0.5m
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