Topics:Ducts, Heat, Heat transfer, Mass transfer, Turbulence
In the paper of Duan [(1)], there is an error in the range of the Prandtl number (Pr) for Eqs. (14) and (15). The correlations of Notter and Sleicher [(2)], Eqs. (14) and (15), are valid for 0.004 < Pr < 0.1 not 0.04 < Pr < 0.1.
The author would like to acknowledge M. M. Awad of Mansoura University, Mansoura, Egypt, for bringing this to my attention.
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New Correlative Models for Fully Developed Turbulent Heat and Mass Transfer in Circular and Noncircular Ducts,”
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by American Society of Mechanical Engineers