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Calculational Procedures for Heat Transfer Coefficient and Pressure Drop
DOI 10.1615/hedhme.a.000242
3.2.2 Calculational procedures for heat transfer coefficient and pressure drop
Jerry Taborek
A. Calculational procedures for plain tubes
Calculations for the inner tube fluid follow standard tube-side procedures (see Section 144 and Section 168). Account should be taken of the U-return bed. The annulus flow uses a modified tube-side flow equation, corrected for the effects of the annulus geometry. Methods as developed by Gnielinski (1983) [1] are recommended as the most accurate and are reproduced below.
(a) Heat transfer in turbulent annulus flow, Re > 8,000
The hydraulic diameter of the annulus Dh is used as the length term in the Nu and Re numbers and is defined as
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