Countercurrent Steam-Water Flow in an Upright 90° Elbow

Wan, Pengxiang

doi:10.1615/ihtc8.4670

Cited by 2 publications

(4 citation statements)

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“…They found flooding limits to be a strong function of small changes in the inclination of the horizontal leg and reported the same effects of the slight inclination as Siddiqui et al, [2]. Wan [6] also conducted water-steam flooding experiments in a vertical-to-horizontal pipe and reported on the additional effects of condensation on the flooding phenomena.…”

Section: Introductionmentioning

confidence: 70%

“…Comparison of Eqs. (6) and (8) shows that for void fractions near 0.5, the flooding conditions predicted by Eqs. (6) and (8) for a horizontal pipe ({3~0) differ only slightly.…”

Section: Mishima and Ishiimentioning

confidence: 92%

“…(6) and (8) shows that for void fractions near 0.5, the flooding conditions predicted by Eqs. (6) and (8) for a horizontal pipe ({3~0) differ only slightly. However, for void fractions greater than 0.8, the revised Taitel and Dukler correlation yields about twice the relative velocity values predicted by the Wallis and Dobson [10] correlation.…”

Section: Mishima and Ishiimentioning

confidence: 92%

“…The Wallis and Dobson [10] correlation is empirical but was developed from experimental data that were obtained with a countercurrent flow of water and air in near-horizontal, rectangular ducts covering void fractions up to almost 1.0. Their correlation for a stratified, countercurrent flow in a round pipe can be given by (6) where C, is a constant equal to 0.5. [II] analytically derived an equation for slugging due to growth of finite-amplitude waves in stratified flow.…”

Section: Slugging Mechanismmentioning

confidence: 99%

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Countercurrent Flooding in Vertical-to-Inclined Pipes

Kawaji

Thomson

Krishnan

1991

Experimental Heat Transfer

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Countercurrent flooding data have been obtained using air and water for vertical-todownwardly inclined pipes containing elbows of varying angles. Experiments were performed with six different test sections, all having an inner diameter of 51 mm and a I-mlong vertical tube connected to an inclined or horizontal tube.The flooding data for 112.5' and 135' elbow angles were almost identical and showed that these geometries required the largest gas flow raJesfor flooding among all the geometries tested. The flooding gas velocitiesfor the 157.5' elbow were slightly less than those of the 112.5' and 135' elbows but greater than those of the vertical pipe without any elbow and vertical-to-horizontalpipes at low to moderate liquid flow rates.In all vertical-to-inclinedpipes, flooding was initiated in the inclined section at about 15 to 50 em downstream of the elbow. Due to the countercurrent flow of gas, the liquid stream just downstream of the elbow became highly agitated and a frothy mixture was carried upstream by gas at flooding. At moderate to high liquid flow rates, the liquid was deflected off at the elbow to form a turbulent, jetlike stream that partially broke up into droplets. These droplets were, at the onset of flooding, entrained and carried over by the gas stream.Comparison ofthe data with the slugging correlation at low liquid flow rates and with the liquid entrainment/carryover model at high liquid flow rates suggested that these mechanisms are likely responsiblefor flooding in vertical-to-inclinedpipes.

show abstract

Section: Introductionmentioning

confidence: 70%

“…Comparison of Eqs. (6) and (8) shows that for void fractions near 0.5, the flooding conditions predicted by Eqs. (6) and (8) for a horizontal pipe ({3~0) differ only slightly.…”

Section: Mishima and Ishiimentioning

confidence: 92%