Flow Pattern Transition During Gas Liquid Upflow Through Vertical Concentric Annuli—Part II: Mechanistic Models

[+] Author and Article Information
G. Das, N. K. Purohit, A. K. Mitra

Department of Chemical Engineering, Indian Institute of Technology, Kharagpur - 721 302, India

P. K. Das

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur - 721 302, India

J. Fluids Eng 121(4), 902-907 (Dec 01, 1999) (6 pages) doi:10.1115/1.2823553 History: Received February 06, 1997; Revised October 06, 1998; Online December 04, 2007


In this paper the transition boundaries between different flow regimes during cocurrent upflow of gas liquid two-phase mixture through concentric annuli has been predicted theoretically. On the basis of the experimental observations (Das et al., 1999), mechanistic models have been proposed to formulate mathematical equations of the regime boundaries as functions of the annulus dimensions, the physical properties, and velocities of the two phases. The analysis has yielded the bubbly-slug transition to occur at a limiting void fraction of 0.2, and the slug-churn transition to occur due to flooding of the liquid films by the Taylor bubbles. A comparison of the model predictions with experimental data corroborate the suitability of the proposed mechanisms.

Copyright © 1999 by The American Society of Mechanical Engineers
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