A study of intermittent flow in downward inclined pipes
- Univ. of Tulsa, OK (United States)
The downward simultaneous flow of gas and liquid is often encountered in hilly terrain pipelines and steam injection wells. Most of the available methods for predicting the behavior of gas-liquid flow in pipes have been developed for horizontal and upward inclined pipes. In this study, co-current steady state slug flow in downward inclined pipes is investigated, experimentally and theoretically. A series of slug flow experiments are conducted with an air-kerosene system in a 2-in. diameter, 75-ft long pipe installed on an inclinable structure. Liquid holdup and pressure drop measurements are obtained for downward inclination angles from 0{degree} to {minus}90{degree} at different flow conditions. Correlations for slug flow characteristics are obtained based on the experimental data. A mechanistic model based on a unit cell approach has been proposed for the prediction of the detailed slug structure, and subsequently the pressure gradient. Fully developed slug flow could not be observed from {minus}50{degree} to {minus}90{degree}. A correlation was obtained for slug liquid holdup, and an analytical model and a correlation were developed for slug translational velocity. The lognormal distribution was found to best fit all the experimental slug length data. Equations for mean and design slug length were derived from the lognormal distribution function for inclination angles ranging from 0{degree} to {minus}30{degree}. A slug frequency correlation was also developed. The model can be used to predict intermittent flow behavior in downward inclined pipes. The correlations for slug liquid holdup, slug translational velocity, and slug length and frequency are closure relationships applicable to any model. Slug frequency information is also imperative for erosion and corrosion rate predictions.
- OSTI ID:
- 442600
- Report Number(s):
- CONF-961105-; ISBN 0-7918-1521-8; TRN: IM9712%%25
- Resource Relation:
- Conference: 1996 international mechanical engineering congress and exhibition, Atlanta, GA (United States), 17-22 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the ASME Heat Transfer Division. Volume 3: Experimental studies in multiphase flow; Multiphase flow in porous media; Experimental multiphase flows and numerical simulation of two-phase flows; Fundamental aspects of experimental methods; HTD-Volume 334; Cheung, F.B. [ed.] [Pennsylvania State Univ., University Park, PA (United States)]; Yang, B.W. [ed.] [Columbia Univ., New York, NY (United States)]; Riznic, J.R. [ed.] [Atomic Energy Control Board, Ottawa, Ontario (Canada)]; Seyed-Yagoobi, J.; Hassan, Y.A.; Kihm, K.D. [eds.] [Texas A and M Univ., College Station, TX (United States)]; Kim, J.H. [ed.] [Electric Power Research Inst., Palo Alto, CA (United States)]; Paolucci, S. [ed.] [Univ. of Notre Dame, IN (United States)]; Oosthuizen, P.H. [ed.] [Queen`s Univ., Kingston, Ontario (Canada)]; PB: 438 p.
- Country of Publication:
- United States
- Language:
- English
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