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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

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) 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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