Slug formation mechanism for air–water system in T-junction microchannel: a numerical investigation

Effect of microchannel junction angle on two-phase liquid-gas Taylor flow

“…Various investigations have been conducted to study the dynamics of gas bubble generation process in Taylor flow (Garstecki et al, 2006;De Menech et al, 2008;Abate et al, 2012;Zhang et al, 2015;Soh et al, 2016;Nekouei and Vanapalli, 2017;Khan et al, 2018). Garstecki et al (2006) demonstrated that the gas bubble formation for Taylor flow in T-junction microchannel is controlled by the blockingsqueezing mechanism at low capillary number (Ca < 10 -2 ).…”

“…Nekouei and Vanapalli (2017) had also employed simulations based on VOF method for the investigation of the effect of viscosity ratio (dispersed phase to continuous phase) on the dispersed drop size, and reach the conclusion that there is only strong dependency when the ratio is more than 1. Similarly with VOF method, Khan et al (2018) discovered that the pressure drop across the gas bubble during the squeezing process is affected by the flow velocity, wall contact angle and surface tension, which in turn affect the generated bubble size.…”

“…Although there are abundant investigations (Garstecki et al, 2006;De Menech et al, 2008;Abate et al, 2012;Zhang et al, 2015;Soh et al, 2016;Nekouei and Vanapalli, 2017;Khan et al, 2018) on the dynamics of gas bubble generation for two-phase liquid-gas Taylor flow, limited investigations have been performed to study the effect of microchannel junction angle (Dietrich et al, 2008;Fries and Rudolf von Rohr, 2009;Tan et al, 2009;Ngo et al, 2016). Dietrich et al (2008) investigated the gas bubble formation in focused-flow micro-devices (with one main channel and two side channels) for various junction angles, i.e.…”

Effects of Channel Hydraulic Diameters and Flow Ratios of Two‐Phase Flow in Y‐Junction Microchannels

“…There are numerous studies available in literature related to the hydrodynamics of microfluidic devices [2][3][4][5][6][7][8][9] for different fluids. Kashid and Agar [1] performed experiments in a capillary having a wettability-based flow splitter and found liquidliquid slug flow.…”

“…Khan et al [9] performed simulations using a gas-liquid two-phase flow system in rectangular microchannels of 1 mm hydraulic diameter and concluded that the contact angle is one of the key parameters to affect the flow behavior and wettability. Kishor et al [8] also reported different flow regimes including slug flow and determined an empirical correlation for pressure drop.…”