Effect of interfacial shear and entrainment models on flooding predictions

Popov, N.K.; Rohatgi, U.S.

doi:10.1002/aic.690320613

Cited by 5 publications

(1 citation statement)

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“…For the aidwater experiments of Zabaras [13], this simplification may be close to reality, since the high surface tension of water compared to that of Refrigerant 12 is likely to suppress liquid entrainment, thus resulting in lower core liquid fractions than in the refrigerant tests [24]. For the Refrigerant 12 test conditions at p = 0.67 MPa, the difference between calculated and measured pressure drops during flooding corresponds, according to Eq.…”

Section: Pressure Drop and Liquid Fractionmentioning

confidence: 93%

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: Pressure Drop and Liquid Fractionmentioning

confidence: 93%