Repeat Problem 7.17 for air flowing over the same two surfaces in the Reynolds number range between
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Repeat Problem 7.17 for air flowing over the same two surfaces in the Reynolds number range between 40,000 and 200,000. Neglect radiation. From Problem 7.17: Develop an expression for the ratio of the rate of heat transfer to air at 40°C from a thin flat strip of width πD/2 and length L at zero angle of attack and a tube of the same length and diameter D in cross-flow with its axis normal to the flow. Assume both surfaces are at 90°C.
GIVEN
- Air flowing over a thin flat strip at zero angle of attack or a tube in crossflow
- Air temperature (T∞) = 40°C
- Tube diameter = D
- Strip width = πD/2
- Tube and strip length = L
- Reynolds number : 40,000 < Re < 200,000
ASSUMPTIONS
- Radiative heat transfer is negligible
- Steady state for both cases
- The tube and strip temperatures (Ts) are 90°C
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Related Book For
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
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