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Heat Transfer & Hydraulic Resistance at Supercritical Pressures in Power Engineering Applications

By
I. L. Pioro
I. L. Pioro
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R. B. Duffey
R. B. Duffey
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ISBN-10:
0791802523
No. of Pages:
300
Publisher:
ASME Press
Publication date:
2007
In general, the total pressure drop for forced convection flow inside a test section installed in the closed-loop system can be calculated according to the following expression:  
Δp=Δpfr+Δp+Δpac+Δpg,
where Δp is the total pressure drop, Pa.
Δpfr is the pressure drop due to frictional resistance (Pa), which defined as  
Δpfr=(ξfrLDρu22)=(ξfrLDG22ρ),
where ξfr is the frictional coefficient, which can be obtained from appropriate correlations for different flow geometries. For smooth circular tubes, ξfr is as follows (Filonenko 1954):  
ξfr=(1(1.82log10Reb1.64)2).
Equation (12.3) is valid within a range of Re = 4.103 − 1012.

Usually, thermophysical properties and the Reynolds number in Equations (12.2) and (12.3) are based on arithmetic average of inlet and outlet values.

Δp is the pressure drop due to local flow obstruction (Pa), which is defined as;  
Δp=(ξρu22)=(ξG22ρ),
where ξ is the local resistance coefficient, which can be obtained from appropriate correlations for different flow obstructions.
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