An experimental investigation of gas–liquid two-phase flow in single microchannel contactors

Characteristics of slug flow with inertial effects in a rectangular microchannel

“…The transition from the squeezing to the shearing regime was found to be mainly influenced by the liquid velocity as shown in Fig. 5, which was also observed by Yue et al (2008). However, an earlier transition happened at 0.2 m/s (j L ) compared to their results.…”

“…It seems that the Armandtype correlation describes well the void fraction for circular capillaries when the inner diameter is larger than 0.2 mm, while the non-linear correlation describes well for smaller capillaries (Chung and Kawaji, 2004;Kawahara et al, 2005;Saisorn and Wongwises, 2010). In square microchannels, the situation is more complex as the experimental data is scarce and deviates from each other (Kawahara et al, 2011;Xiong and Chung, 2007;Yue et al, 2008). However, Xiong and Chung (2007) found a tendency from linear to non-linear correlation when channel size decreased, which is in accordance with circular capillaries.…”

“…In this case, the gas bubble length is independent of the fluid properties, and only depends on the two-phase flow rate ratio and the inlet geometry (Garstecki et al, 2006;van Steijn et al, 2010). At high Ca, the shearing regime occurs, which is characterized by the gas bubble partly occupying the cross section of the channel (Guo and Chen, 2009;Yue et al, 2008). Under this regime, the shear stress and inertia play an important role in the pinch-off.…”

“…Also gas hold-up is usually used to evaluate accelerational terms in the total pressure drop of gas-liquid flow (Yue et al, 2008(Yue et al, , 2009 There are already plenty of literature studies that consider void fraction in small/micro-capillaries or channels (Choi et al, 2011;Chung and Kawaji, 2004;Ide et al, 2007;Kawahara et al, 2009Kawahara et al, , 2011Kawahara et al, , 2005Saisorn and Wongwises, 2009Xiong and Chung, 2007;Yue et al, 2008). Generally, the void fraction correlation for microchannels as a function of volumetric quality (β) can be classified to two types: linear relationship of Armand-type α¼C A β and nonlinear relationship of α¼C 1 β 0.5 /(1-C 2 β 0.5 ).…”

Experimental Study on Removal of H2S using MDEA Solution in Microchannel

“…Gas-liquid micro reactors that have a two-phase flow in micro-geometries has many advantages over analogous macro-scale reactors. An ultra-high surface to volume ratio can be achieved using a micro reactor because the micron scale linear size enhances the heat and mass transfer processes [19].…”