An experimental study of air–water Taylor flow and mass transfer inside square microchannels

Characteristics of slug flow with inertial effects in a rectangular microchannel

“…(6). This linear relationship was observed in many literatures (Abadie et al, 2012;Choi et al, 2010;Taha and Cui, 2004;Yue et al, 2009), which usually explained the relationship with stagnant film hypothesis that the liquid film velocity is negligible. The slope of the regression line (red line) was determined to be 1.12, which is comparable with Choi et al (2010).…”

“…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 ).…”

“…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.…”

Study on the Characteristics of Bubble and Liquid Slugs for Gas-Liquid Taylor Flow in a Rectangular Micro-channel

“…과 Yue et al (9) 의 경우도 사각 채널에 대해 기체의 속도를 예측할 수 있는 식을 제안하였다 (식(9), 식(10)). 기포 속도에 대해 식(9)와 식(10)을 본 실험결과와 비교하여 Fig.…”

“…Chaoqun et al (5) 의 경우는 속도가 높게 예측이 되었고, Yue et al (9) 의 경우는 수력직경이 600 ㎛인 경우에 대해 식(11) 의   의 값을 0.8로 두고 적용하여 비교적 잘 예측이 됨을 확인하였다. Chaoqun et al (5) 의 경우 수력직경이 약 400 ㎛로 본 연구에서 사용한 유로보다 작으며, 유 로의 직경이 감소함(Yue et al (9) 과 Fukano and Kariyasaki (12) )에 따라   의 값이 증가하는 경향에 의해 예측 의 오차가 발생한 것으로 사료된다. …”