Heat transfer and friction factor of turbulent flow through a horizontal semi-circular duct |
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Authors: | N S Berbish M Moawed M Ammar R I Afifi |
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Institution: | (1) Mechanical Engineering Department, Shoubra Faculty of Engineering, Benha University, Cairo, Egypt; |
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Abstract: | Forced convection heat transfer and pressure drop characteristics of air flow inside a horizontal semi-circular duct are investigated
experimentally. The experiments are carried out on a semi-circular duct of 23 mm inner radius, 2 mm thickness, and 2,000 mm
length within a range of Reynolds number (8,242 ≤ Re ≤ 57,794)., under uniform wall heat flux conditions. The friction factor
is determined by measuring the axial static pressure at different selected axial stations along the semi-circular duct. The
variations of surface and mean air temperatures, local heat transfer coefficient, local Nusselt number, and the friction factor
with the axial dimensionless distance are presented. It is observed that, for a given value of Reynolds number, each of the
local heat transfer coefficient and the friction factor has a relatively high value near the entrance of the semi-circular
duct then it decreases with increasing the dimensionless axial distance until it approaches a nearly constant value at the
fully developed region. Also, it is found that, with increasing the Reynolds number the average heat transfer coefficient
is increased and the friction factor is decreased. Moreover, empirical correlations for the heat transfer coefficient and
friction factor as a function of the Reynolds number are obtained. |
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