Two-phase flow patterns in microfluidic cross-shaped junctions and slug hydrodynamics in the dripping regime

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

Flow patterns for water-butanol, water-toluene and waterhexane two-phase flows were visualized in the cross-shaped junctions of three square glass microchannels with hydraulic diameters of 200 μm, 400 μm and 600 μm. Typical flow pattern maps for water-butanol two-phase flow were developed based on Capillary number of the continuous phase and Weber number of the dispersed phase, and compared with a previous flow pattern map in the literature. Three main flow pattern groups were observed, including the tubing/threading regime group, the dripping regime and the jetting regime. The geometry confinement and fluid properties affected the viscous shear and interfacial tension forces and therefore their influence on flow pattern transitions was clarified. Besides, in the dripping regime, the dimensionless slug length can be scaled as a function of the flow rate ratio and the Capillary number of the continuous phase.

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Subject classification (UKÄ) – MANDATORY

  • Energy Engineering
Original languageEnglish
Title of host publicationHeat Transfer Equipment; Heat Transfer in Multiphase Systems; Heat Transfer Under Extreme Conditions; Nanoscale Transport Phenomena; Theory and Fundamental Research in Heat Transfer; Thermophysical Properties; Transport Phenomena in Materials Processing and Manufacturing
PublisherAmerican Society of Mechanical Engineers
Volume2
ISBN (Electronic)9780791857892
Publication statusPublished - 2017
Publication categoryResearch
Peer-reviewedYes
EventASME 2017 Heat Transfer Summer Conference, HT 2017 - Bellevue, United States
Duration: 2017 Jul 92017 Jul 12

Conference

ConferenceASME 2017 Heat Transfer Summer Conference, HT 2017
CountryUnited States
CityBellevue
Period2017/07/092017/07/12