Mass transfer intensification of slug flow by interfacial deformation at low flow rate in the microchannels with periodic expansion units

Yang, Han; Li, Hengbo; Fu, Taotao; Liu, Dayu; Wang, Xiaoda

doi:10.1016/j.ces.2023.118743

Cited by 6 publications

(1 citation statement)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They concluded that mixing intensity is higher but short-lived in sudden expansion in time and space scale. Similar studies on liquid–liquid mixing and mass transfer intensification in a series of sudden expansion/contraction cavities are reported by Zhang et al and Han et al, respectively. Recently, Chaudhary and Ghosh investigated the role of area reduction, contaction and expansion on hydrodynamics and extraction in both experimentally and numerically two-component flow.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of a Sudden Jump in Wettability on Two-Component Liquid Flow in Sudden Contraction Devices

Chaudhary,

Ghosh

2024

Langmuir

View full text Add to dashboard Cite

This study experimentally investigated the effect of wettability and sudden changes in flow area on liquid−liquid extraction operation. The wall surface wettability has been altered by connecting the glass capillary (hydrophilic) and poly(tetrafluoroethylene) (PTFE)-coated capillary (hydrophobic) together in four different arrangements. In all of the arrangements, a 2 mm inner diameter tube of 35 cm length is used upstream, while a 1 mm inner diameter tube of 35 cm length is used downstream. Acetic acid mixed with toluene and water is used as a test fluid. Various flow patterns are observed: slug, droplet, slug with the droplet, and encapsulated drop in slug. The extraction efficiency is observed to be the maximum when the hydrophobic tube is used upstream, followed by a hydrophilic tube downstream. Due to the contraction effect, the specific surface area of the slug increases from 1.6 to 2.7 times. Further numerical simulations have been run using open CFD software OpenFoam to see the inner flow physics at the maximum efficiency due to a sudden jump in wettability. The presence of a recirculating zone downstream just after the plane of area change leads to the formation of encapsulated drop and enhances circulation within the slug.

show abstract

Section: Introductionmentioning

confidence: 99%