Abstract

SCHOENFELD, P.D.  and  KROGERT, D.G.. Flooding during reflux condensation of steam in an inclined elliptical tube. R&D j. (Matieland, Online) [online]. 2000, vol.16, pp.1-8. ISSN 2309-8988.

In this experimental investigation the pressure drop is measured between the headers located at the ends of an inclined air-cooled elliptical tube in which reflux condensation of steam occurs. The cross-section of the 7 m long tube has a height of 97 mm (major axis) and a width of 16 mm (minor axis). Steam temperatures are in the range of 45° C to 65° C. The pressure drop can be predicted accurately using the Zapke-Kròger pressure drop model applicable to reflux condensers. At a certain steam flow rate a sudden sharp increase in the pressure drop occurs. This phenomenon is known as flooding. The measured vapour velocities at flooding agree well with the values predicted by the Zapke-Kröger flooding correlation. The experimental results also show that flooding has a detrimental effect on the thermal effectiveness of the elliptical tube.

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