Numerical investigation on the hydrodynamics of Taylor flow in ultrasonically oscillating microreactors

A Review on the Hydrodynamics of Taylor Flow in Microchannels: Experimental and Computational Studies

“…The pressure distribution in liquid slug and gas bubble was significantly different due to the interfacial effects The interfacial pressure difference at the nose was greater than the tail of the gas bubble d = 0.5 mm V g = 0.245 ms −1 V l = 0.255 ms −1 Re = 280 Ca = 0.006 2D GL Numerical [152] Total pressure drop ∆p = 16+ 7.16(3Ca) The pressure drop behavior with L * (Ca/Re) Besides, Song et al [180] expressed the total pressure drop considering the total number of water slugs (n), including the pinching off slug, ∆p t = ∆p g + ∆p cr + (n − 1)∆p s (18) where the first term indicates the pressure drop of single-phase flow of gas, the second term is the critical pressure drop to break up the water slugs, and the last term denotes the pressure drop due to the moving slugs through the capillary.…”

“…Their results also showed a huge increase of heat transfer rate up to 700% compared to single-phase flow indicating more effectiveness of short slugs on the heat transfer rate. Xu et al [152] numerically simulated 3D Taylor flow in a microchannel with a square cross-section under ultrasonic oscillation. A harmonic, vertical, and ultrasonic oscillating applied to microreactor as, d y = A cos (ω 0 t) (…”

“…A summary of analytical and numerical investigations on the flow patterns and the formations of the gas/liquid slugs is presented in Table 6. Xu et al [152] numerically simulated 3D Taylor flow in a microchannel with a square cross-section under ultrasonic oscillation. A harmonic, vertical, and ultrasonic oscillating applied to microreactor as, d y = A cos (ω 0 t) (…”

“…The sub-harmonic bubble surface wave was also created by the pressure pulsation in the parallel direction of the oscillation. Xu et al [152] numerically simulated 3D Taylor flow in a microchannel with a square cross-section under ultrasonic oscillation. A harmonic, vertical, and ultrasonic oscillating applied to microreactor as, d y = A cos (ω 0 t) (…”

Taylor bubble formation and flowing in a straight millimetric channel with a cross-junction inlet geometry Part II: Gas-liquid mass transfer

“…Microstructured continuous-flow technology is now considered as one of the effective approaches for process intensification and gained many interests for a wide range of applications (Geng et al, 2020;Liu et al, 2020;Yan et al, 2021), especially for multiphase reactions (e.g., hydrogenation and (photo)oxidation). They could indeed offer several advantages compared to conventional batch processes, such as the enhanced heat and mass transfer rates, narrow residence time distribution, high exchange surface areas, and higher yields and selectivity (Willms et al, 2019;Mariotti et al, 2020;Xu et al, 2021;Yang et al, 2022).…”