Film fractionation of air in apparatus with a regular crimped packing

Alekseev, V. P.; Gerasimov, P. V.; Poberezkin, A. É.

doi:10.1007/bf01137344

Cited by 1 publication

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“…Analytical models may be classified into three categories according to whether they are based on entrainment, wave instability or film flow mechanisms. Extensive reviews of this work have been published by Bankoff and Due to the complexity of the problem, the most widely used tools to predict flooding are essentially empirically derived equations, such as correlations of Wallis [3], Pushkina and Sorokin [4], Feind [5] and Alekseev et al [6,71. These correlations yield accurate results only for experimental conditions similar to those, for which they had been developed since the combined effects of crucial parameters, such as channel dimensions and fluid properties are not always accounted for in detail.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical study of countercurrent flow limitation in vertical gas/liquid flows

Stephan

Mayinger

1992

Chem Eng & Technol

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An experimental and analytical study of adiabatic countercurrent flow limitation (flooding) in single vertical ducts is reported. The experiments were carried out in a rectangular channel using saturated liquid and vapour of Refrigerant 12 (CC1,F;). The steady-state liquid delivery (flooding) curves as well as local pressure drop and void fraction distributions in the countercurrent flow were measured in a range of system pressures from pIpcrit = 0.16 to p/pcrit = 0.3 1, and for various total liquid injection rates and locations. The measured flooding curvesjl = f (j,) as well as pressure drop and void fraction during partial liquid delivery (j, < j,in) were not affected either by the axial liquid feed location or by the excess liquid rate carried upwards by the vapour. Moreover, for given flow conditions during flooding pressure drop and void fraction were essentially the same at different axial positions. Radial void fraction distributions evaluated from optical fibre probe data indicate an annular-type flow pattern. Based on this experimental evidence, a mechanistic core/film flow model was developed for the calculation of flooding. The analytical results are compared with the present high pressure and with comparable atmospheric pressure experimental data, showing reasonable overall predictions not only of the flooding curves, but also of the pressure drop in countercurrent flow.

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Section: Introductionmentioning

confidence: 99%