Water-oil flow in square microchannels with a crossed junction

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Abstract

In the present study, water-oil flow patterns and slug hydrodynamics were experimentally studied in square glass microchannels with various hydraulic diameters (Dh = 600 µm, 400 µm, 200 µm). The aqueous phase is the continuous phase while the organic phase is the dispersed phase. The ranges of flow rates of the continuous phase and the dispersed phase are 0-200 ml/h and 0-12 ml/h, 0-120 ml/h and 0-6 ml/h, and 0-60 ml/h and 0-2 ml/h in the microchannels with Dh = 600 µm, 400 µm and 200 µm, respectively. The results show that the hydraulic diameter has significant effects on flow patterns and three main flow patterns are observed, i.e., annular flow, slug flow and droplet flow. Generally, annular flow appeared at high flow rates of the dispersed phase and low flow rates of the continuous phase, while droplet flow appeared at low flow rates of the dispersed phase and high flow rates of the continuous phase. However, slug flow existed at comparable flow rates of the continuous and dispersed phases. A dimensionless analysis is carried out and a new dimensionless group including Weber number and Reynolds number is derived. The new defined dimensionless group performs well to develop a general flow pattern map. In addition, slug flow hydrodynamics are investigated as well in the present study, considering the slug length and slug velocity. Based on the present experimental results, a new scaling law is proposed to predict the slug length and it shows a good agreement with the experimental results. It has been widely reported that slug velocities depend linearly on the total flow rates of the two phases, which is consistent with the present study. The linear law provides a good prediction of the experimental slug velocities but different slopes are suggested in microchannels with different hydraulic diameters.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Zhejiang University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Strömningsmekanik och akustik

Nyckelord

Originalspråkengelska
Titel på värdpublikationFluid Machinery; Erosion, Slurry, Sedimentation; Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; Micro/Nano-Fluidics
FörlagAmerican Society of Mechanical Engineers(ASME)
Volym3
ISBN (elektroniskt)9780791851579
StatusPublished - 2018
PublikationskategoriForskning
Peer review utfördJa
EvenemangASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2018 - Montreal, Kanada
Varaktighet: 2018 jul 152018 jul 20

Konferens

KonferensASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2018
LandKanada
OrtMontreal
Period2018/07/152018/07/20