Journal ArticleDOI
Countercurrent gas‐liquid annular flow, including the flooding state
George John Zabaras,A. E. Dukler +1 more
TLDR
In this paper, the structure of the wavy interface on a falling liquid film is studied for conditions of countercurrent gas flow in order to investigate mechanisms for flooding, and it is shown that under all conditions, including flooding, the waves propagate only downward and are never of such amplitude as to bridge the tube.Abstract:
The structure of the wavy interface on a falling liquid film is studied for conditions of countercurrent gas flow in order to investigate mechanisms for flooding. Measurements taken just below the liquid feed and at 1.7 m down the tube show that under all conditions, including flooding, the waves propagate only downward and are never of such amplitude as to bridge the tube. These observations are in contrast to speculations in the literature that upward flow of waves or bridging of liquid due to waves cause flooding. In the mechanism suggested, flooding is due to flow reversal in the film just at the liquid entry.read more
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Journal ArticleDOI
Flooding and churn flow in vertical pipes
TL;DR: In this paper, a 32 mm dia vertical pipe with various forms of liquid outlet, namely a porous wall, a tapered outlet, and a square-edged outlet, was used to investigate the effect of churn flow on the penetration rate.
Journal ArticleDOI
Theoretical investigation of the diameter effect on flooding in countercurrent flow
TL;DR: In this article, the CFDS-FLOW3D computational fluid dynamics code is used to determine the force exerted on a standing wave by gas flowing over it, and it is found that the drag on the wave is mainly due to the pressure variation around it and that it is a strong function of the channel dimensions.
Journal ArticleDOI
Effect of tube diameter on flooding
TL;DR: In this article, the effect of tube diameter on the mechanism of flooding in vertical gas-liquid countercurrent annular flow was investigated. But the results indicated that the mechanism was qualitatively different in the small and the large diameter test sections.
Journal ArticleDOI
Interactions of coherent structures in a film flow: Simulations of a highly nonlinear evolution equation
TL;DR: In this paper, the authors presented numerical simulations of the evolution equation for thickness of a film flowing down a vertical fiber and presented solutions with periodic boundary conditions on extended axial intervals developed trains of pulse-like structures.
Journal ArticleDOI
Erratum to “Experimental study on the air/water counter-current flow limitation in a model of the hot leg of a pressurized water reactor”
Deendarlianto,Deendarlianto,Christophe Vallée,Dirk Lucas,Matthias Beyer,Heiko Pietruske,Helmar Carl +6 more
TL;DR: In this paper, an experimental investigation on the air/water counter-current two-phase flow in a horizontal rectangular channel connected to an inclined riser has been conducted, where a high-speed camera in the bended region of the hot leg, delivering a detailed view of the stratified interface as well as of dispersed structures like bubbles and droplets.