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12 - Horizontal annular flow

Published online by Cambridge University Press:  05 November 2013

Thomas J. Hanratty
Thomas J. Hanratty
Affiliation:
University of Illinois, Urbana-Champaign
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Summary

Prologue

Horizontal annular flows differ from vertical annular flows in that gravity causes asymmetric distributions of the liquid in the wall layer and of droplets in the gas flow. The understanding of this behavior is a central problem in describing this system. Because of these asymmetries, entrainment can increase much more strongly with increasing gas velocity than is found for vertical flows.

Theoretical analyses of the influence of gravity on the distribution of liquid in the wall film and on the distribution of droplets in the gas phase are reviewed. As with vertical annular flows, entrainment is considered to be a balance between the rate of atomization of the wall film and rate of deposition of droplets. Because of the asymmetric film distribution, the local rate of atomization varies around the pipe circumference. This is treated theoretically by assuming that the local rate is the same as would be observed for vertical annular flow. Gravitational settling contributes directly to deposition so that the rate of deposition is enhanced. Thus, at low gas velocities, entrainment can be much smaller for horizontal annular flows than for vertical annular flows.

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Physics of Gas-Liquid Flows , pp. 292 - 330
Publisher: Cambridge University Press
Print publication year: 2013

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References

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  • Horizontal annular flow
  • Thomas J. Hanratty, University of Illinois, Urbana-Champaign
  • Book: Physics of Gas-Liquid Flows
  • Online publication: 05 November 2013
  • Chapter DOI: https://doi.org/10.1017/CBO9781139649421.014
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  • Horizontal annular flow
  • Thomas J. Hanratty, University of Illinois, Urbana-Champaign
  • Book: Physics of Gas-Liquid Flows
  • Online publication: 05 November 2013
  • Chapter DOI: https://doi.org/10.1017/CBO9781139649421.014
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Horizontal annular flow
  • Thomas J. Hanratty, University of Illinois, Urbana-Champaign
  • Book: Physics of Gas-Liquid Flows
  • Online publication: 05 November 2013
  • Chapter DOI: https://doi.org/10.1017/CBO9781139649421.014
Available formats
×