Prediction of gas‐liquid holdup for inclined flows

Greskovich, E. J.

doi:10.1002/aic.690190532

Cited by 3 publications

(11 citation statements)

References 8 publications

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“…as described by Cooper (1975). It is noted in Figure 1 that prior data from Guzhov et al (1967) with a pipe approximately 5.08 cm in diameter and Greskovich (1973) with a pipe approximately 2.54 cm in diameter are plotted at an inclination of 9 deg. from the horizontal.…”

Section: Data From Larger Diameter Pipesmentioning

confidence: 98%

“…Since it became apparent that Greskovich (1973) was recommending a new procedure for obtaining in situ liquid holdups and suggesting that the correlation was strongly dependent on angle of inclination, it was necessary to further test these assumptions in our laboratories at larger pipe diameters. Liquid holdups were obtained in a 7.94 cm diameter pipe, approximately 939 cm long, which was inclined from the horizontal in a range from 1 to 10 deg.…”

Section: Data From Larger Diameter Pipesmentioning

confidence: 98%

“…It has been shown that in-situ, or true, liquid holdups for inclined two-phase slug flows can be easily obtained over the range by experimentally measuring such holdups at zero input liquid qualities and then extrapolating the data based on Greskovich (1973). Experimental holdup data from a 7.94 cm diameter pipe were compared with data from smaller diameter pipes, and, based on the correlation of true liquid holdup against input liquid quality, by using mixture Froude number and angle of inclination as parameters, there appeared to be little direct effect of pipe diameter for pipes greater than 2.54 cm other than that taken into account by the mixture Froude number.…”

Section: Conclusion a N D Significancementioning

confidence: 99%

“…from the horizontal. More recently, Greskovich (1973) developed a new technique for obtaining true liquid holdups for inclined (positive inclinations) two-phase flows. The technique consisted of measuring liquid holdups at zero liquid flow rates, corresponding to bubbling gas upward through a quiescent liquid.…”

Section: Conclusion a N D Significancementioning

confidence: 99%

“…The correlation is based on experimental data collected in pipes ranging from 2.54 to 7.94 cm in diameter with the air-water system used.The experimental data used to develop the correlation were collected at zero input liquid qualities, as previously discussed by Greskovich (1973), and extended over the entire range. These data revealed little diameter effect on holdup for diameters greater than 2.54 cm but a marked effect of angle of inclination.…”

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confidence: 99%

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Correlation and prediction of gas‐liquid holdups in inclined upflows

Greskovich

Cooper

1975

AIChE Journal

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A correlation is developed for predicting in-situ (or true) liquid holdups for two-phase, gas-liquid slug flows in inclined pipes. The correlation is based on experimental data collected in pipes ranging from 2.54 to 7.94 cm in diameter with the air-water system used.The experimental data used to develop the correlation were collected at zero input liquid qualities, as previously discussed by Greskovich (1973), and extended over the entire range. These data revealed little diameter effect on holdup for diameters greater than 2.54 cm but a marked effect of angle of inclination. Predicted holdup values show good agreement with experimental data. E. J. GRESKOVICH and W. T. COOPER Department of Chemical EngineeringBucknell University Lewisburg, Pennsylvania 17837 SCOPEThe prediction of liquid holdup for two-phase, gasliquid slug flows in pipelines is a must for design engineers. Correlations, for example, based on the early work of Lockhart and Martinelli (1949) for horizontal flows have been extended to inclined flows, and predictions by Flannigan (1958) for the contribution of hills to overall line pressure drops have markedly added to the technology, but both leave a lot to be desired.The objective of the research reported here was to develop a holdup correlation for inclined two-phase flows using only operating parameters known a priori to the design engineer. The correlation was to be tested with data collected in pipes up to a diameter of 7.94 cm with the air-water system used. Rather than collect holdup data over the entire range of input liquid qualities, experimental data at zero input liquid qualities were obtained and extrapolated by using a new technique (Greskovich, 1973) based on the correlation of Guzhov et al. (1967).Once verified, the model and resulting correlation can be used for scale-up purposes. CONCLUSIONS A N D SIGNIFICANCEIt has been shown that in-situ, or true, liquid holdups for inclined two-phase slug flows can be easily obtained over the range by experimentally measuring such holdups at zero input liquid qualities and then extrapolating the data based on Greskovich (1973). Experimental holdup data from a 7.94 cm diameter pipe were compared with data from smaller diameter pipes, and, based on the correlation of true liquid holdup against input liquid quality, by using mixture Froude number and angle of inclination as parameters, there appeared to be little direct effect of pipe diameter for pipes greater than 2.54 cm other than that taken into account by the mixture Froude number.

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Section: Data From Larger Diameter Pipesmentioning

confidence: 98%

Section: Data From Larger Diameter Pipesmentioning

confidence: 98%

Section: Conclusion a N D Significancementioning

confidence: 99%

Section: Conclusion a N D Significancementioning

confidence: 99%

mentioning

confidence: 99%

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Correlation and prediction of gas‐liquid holdups in inclined upflows

Greskovich

Cooper

1975

AIChE Journal

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Comments on the prediction of liquid holdup for gas‐liquid flow in inclined pipes

Gregory

1974

Can J Chem Eng

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Four correlations for predicting the in situ liquid volume fraction for gas‐liquid flow in inclined pipes have been tested against available data from the literature. It is demonstrated that the commonly used correlations of Baker(4) and Flanigan(5) are subject to large errors. It is recommended that the correlation of Guzhov et al(2) be used unless it predicts values of EL less than 0.25. In the latter case, the Lockhart‐Martinelli(3) correlation should be used.

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Comparison of methods for the prediction of liquid holdup for upward gas‐liquid flow in inclined pipes

Gregory

1975

Can J Chem Eng

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Three methods for predicting the in situ liquid volume fraction for the upward flow of gas‐liquid mixtures in inclined pipes have been tested against available data from the literature. Combined with the results of an earlier paper, a total of seven methods have been compared. It is demonstrated that for angles of up to 10°, pipeline inclination has little effect on the predicted holdup. Correlations arc recommended for use under specified conditions.

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Prediction of gas‐liquid holdup for inclined flows

Cited by 3 publications

References 8 publications

Correlation and prediction of gas‐liquid holdups in inclined upflows

Correlation and prediction of gas‐liquid holdups in inclined upflows

Comments on the prediction of liquid holdup for gas‐liquid flow in inclined pipes

Comparison of methods for the prediction of liquid holdup for upward gas‐liquid flow in inclined pipes

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