Since the Prandtl number and the heat capacity of air are nearly independent of temperature, Eq. (12.34)

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Since the Prandtl number and the heat capacity of air are nearly independent of temperature, Eq. (12.34) seems to indicate that hi for air increases with μ0.2

(a) Explain this anomaly and determine the approximate dependence of hi on temperature, using h∝ Tn.

(b) How does hi for air vary with temperature if the linear velocity, rather than the mass velocity, is kept constant?

Eq. 12.34

St Pr2/3= 0.023, Re02 (12.34)

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Unit Operations Of Chemical Engineering

ISBN: 9780072848236

7th Edition

Authors: Warren McCabe, Julian Smith, Peter Harriott

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