Enhancement of gas-liquid mass transfer in curved membrane contactors with the generation of dean vortices

Packing size effects on the liquid circulation property in an external‐loop packed bubble column

“…The effects of liquid property on the packed bubble column are also under consideration by several researchers, Deshpande et al 11 demonstrated that the bubble size in the packed column is related to a balance between bubble buoyancy and surface tension. The surface tension reduction causes bubbles breaking into smaller ones, leading to a decreased bubble rise velocity, thus, the gas holdup and mass transfer increase, 16,17 Similar results are also observed when reducing liquid viscosity due to the same reason 18–20 . As the buoyancy force increases with density, which assists bubbles to leave the reactor, the gas holdup and gas–liquid mass transfer will decrease accordingly 21,22 …”

“…The surface tension reduction causes bubbles breaking into smaller ones, leading to a decreased bubble rise velocity, thus, the gas holdup and mass transfer increase, 16,17 Similar results are also observed when reducing liquid viscosity due to the same reason. [18][19][20] As the buoyancy force increases with density, which assists bubbles to leave the reactor, the gas holdup and gas-liquid mass transfer will decrease accordingly. 21,22 In recent years, three-phase reaction has emerged as a most promising solution for the system of strong exothermic gas-phase reactions.…”

Continuous Counter-Current Multistage Microextraction in a Novel Tube-In-Tube Microextractor

“…(10) (11) where K, C f , C s , H, and μ f are the overall mass-transfer coefficient, the concentration of the feed, the concentration of the solvent, distribution coefficient, and the velocity of the feed.…”

“…Originally, LPME systems were based on the extraction of analytes into a small drop of an organic solvent . Following their work, driven by advances in materials development and fabrication methods for microdevices, substantial efforts − have been devoted to the LPME technique, and one of the most important developments was that the batch mode was changed into the continuous operation: Agar et al proposed a novel liquid–liquid slug-flow capillary microreactor, which was found to offer greater efficiency in comparison to conventional equipment. In addition to the slug flow, other flow patterns, such as droplet flow and parallel flow, were also feasible to conduct continuous operation. − Continuous LPMEs have been proven to be helpful in enhancing extraction efficiency for most situations.…”