Coating the inside of a capillary of square cross section

Characteristics of slug flow with inertial effects in a rectangular microchannel

“…Kolb and Cerro (1991) extended this work to square capillaries and indicated that when Ca was less than 0.1, the bubble is non-axisymmetric. This transitional value of Ca was later revised to 0.04 by Thulasidas et al (1995).…”

“…The liquid film distribution in square capillaries is not cylindrically symmetric due to the corners, which differs from that of their circular counterparts. The gas bubble shape in the cross section is also non-axisymmetric as the corners is affected by larger viscous forces than the regions near the center of the walls (Kolb and Cerro, 1991). However, the gas bubble shape presents a shifting from non-axisymmetric to axisymmetric above a transitional value of Ca (O(10 −2 )) (Fries et al, 2008;Han and Shikazono, 2009a;Kolb and Cerro, 1991;Kuzmin et al, 2011;Thulasidas et al, 1995), as shown in Fig.…”

“…Bubble shape model Many researches have focused on the gas bubble shape and the liquid film thickness in square capillaries or microchannels (Fries et al, 2008;Kolb and Cerro, 1991;Thulasidas et al, 1995). So far, experimentally determining film thickness and bubble shape in microchannels is rather difficult, especially with rectangular crosssection.…”

“…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). The liquid film distribution in square capillaries is not cylindrically symmetric due to the corners, which differs from that of their circular counterparts.…”

“…In most of the literatures considering the liquid film thickness, Ca was varied by increasing the liquid viscosity, so the Reynolds number (Re) was always small (Kolb and Cerro, 1991;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).…”