Inertial and interfacial effects on pressure drop of Taylor flow in capillaries

Characteristics of slug flow with inertial effects in a rectangular microchannel

“…Increasing gas velocity or liquid velocity would both lead to increase in the liquid film thickness. As described by Aussillous and Quéré (2000), Heil (2001), Kreutzer et al (2005b), inertia has an effect on the film thickness. The thickening effect of inertia in this system was much stronger at high We that the thickening could be directly observed from the images.…”

“…The thickness of liquid film has mainly been studied in circular capillaries that it was considered as a function of the capillary number (Ca) (Aussillous and Quéré, 2000;Bretherton, 1961;Han and Shikazono, 2009b;Kreutzer et al, 2005b). More recently, attention has been paid to microchannels with other cross sections (Fries et al, 2008;Han and Shikazono, 2009a;Kolb and Cerro, 1991;Kuzmin et al, 2011;Thulasidas et al, 1995).…”

“…Many results have shown that the inertia has a considerable influence on the liquid film thickness and the gas bubble shape (Aussillous and Quéré, 2000;Han and Shikazono, 2009a;Heil, 2001;Kreutzer et al, 2005b). For a given Ca, a decrease in the liquid film thickness up to Re of about 100, followed by an increase for higher Re was numerically discovered by Kreutzer et al (2005b) and Heil (2001). Aussillous and Quéré (2000) reported the thickening effect of inertia with low viscosity fluid and proposed an inertia-dependent scaling law for qualitatively explaining this effect as δ/D H ∼Ca 2/3 /(1+Ca 2/3 -We).…”

“…These merits make slug flow an ideal regime for improving the reaction performance. Wide attention has been paid to the bubble formation process (Fu et al, 2009;Garstecki et al, 2006;Pohorecki and Kula, 2008;van Steijn et al, 2007), the gas bubble and the liquid slug length (Garstecki et al, 2006;Leclerc et al, 2010;Qian and Lawal, 2006;Sobieszuk et al, 2010), the liquid film thickness around bubbles (Fries et al, 2008;Han and Shikazono, 2009a;Thulasidas et al, 1995), the phase distribution (Choi et al, 2011;Kawahara et al, 2005;Saisorn and Wongwises, 2010), the pressure drop (Kreutzer et al, 2005a(Kreutzer et al, , 2005bYue et al, 2009), and the mass transfer (Sobieszuk et al, 2011;van Baten and Krishna, 2004;Vandu et al, 2005), etc. However, a full understanding of slug slow for optimizing the design of microreactor remains pendent.…”

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

“…Many numerical studies to date have contributed to improved understanding of two-phase slug flow in small channels [12][13][14][15][16][17][18][19][20][21][22][23][24]. Kreutzer et al [21] investigated the influence of both the Capillary and Reynolds numbers on film thickness, pressure drop, and liquid flow patterns.…”