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Modeling Transient Churn-Annular Flows in a Long Vertical Pipe

[+] Author Affiliations
M. V. C. Alves, J. R. Barbosa, Jr.

Federal University of Santa Catarina, Florianópolis, SC, Brazil

P. J. Waltrich

Louisiana State University, Baton Rouge, LA

G. Falcone

TU Clausthal, Clausthal-Zellerfeld, Germany

Paper No. IMECE2013-64534, pp. V08CT09A028; 14 pages
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 8C: Heat Transfer and Thermal Engineering
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5636-9
  • Copyright © 2013 by ASME


A mathematical model is presented to describe the behavior of transient gas-liquid flows involving the churn and annular flow patterns in a long vertical tube. The HyTAF (Hyperbolic Transient Annular Flow) code, developed specifically for this study, is based on the one-dimensional multi-fluid formulation and takes account of hydrodynamic non-equilibrium flow conditions by means of relationships for the rates of droplet entrainment and deposition. A finite difference algorithm is employed to solve the hyperbolic system of mass, momentum and energy equations via the Split Coefficient Matrix Method. The modeling results are compared with experimental data for steady-state annular and churn flows obtained from the literature and with pressure and flow rate induced transient churn-annular flow data generated in a large scale facility (48-mm ID, 42-m long test section).

Copyright © 2013 by ASME



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