Flow patterns of n-hexadecane-CO2 liquid-liquid two-phase flow in vertical pipes under high pressure

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

To promote a better understanding of liquid-liquid two-phase flow behavior, particularly under high pressure, flow patterns of n-hexadecane-CO2 liquid-liquid two-phase upward flow in vertical stainless steel pipes were experimentally investigated. Observations were made in two 0.0015 m I.D. pipes of different lengths (0.068 m and 0.5 m) under high pressure varying from 10.3 to 29.6 MPa using a high pressure visualization system. The total flow rate was fixed at 2.0 × 10-6 m3/min, while the flow rate ratio (φ) varied from 0.05 to 19. Bubbly flow, plug flow, slug flow, annular flow, and near-one-phase flow regions were found in both pipes, while stratified flow was observed only in the 0.068 m pipe. Flow pattern maps were constructed in the flow rate ratio versus pressure graph, which demonstrates significant impacts of flow rate ratio, pipe length, and pressure on flow patterns. These impacts are discussed in detail. To the authors' best knowledge, this work is the first attempt to observe complex liquid-liquid two-phase flow behavior with flow pattern transitions under high pressure, and contributes to a better understanding of liquid-liquid two-phase flow behavior.

Original languageEnglish (US)
Pages (from-to)566-579
Number of pages14
JournalInternational Journal of Multiphase Flow
Volume35
Issue number6
DOIs
StatePublished - Jun 1 2009

Keywords

  • Flow pattern
  • Hexadecane-carbon dioxide system
  • High pressure
  • Liquid-liquid two-phase flow

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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