Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 32, Issue 12, Pages 1984-1991Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.200900351
Keywords
Bubble formation; Collapse; Gas-liquid flow; Microchannel; Squeezing regime
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Funding
- National Natural Science Foundation of China [20706041, 20876109]
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Bubble emergence in a gas-liquid flow in a T-junction microchannel of 100 mu m diameter, operated under a squeezing regime, was simulated with the computational fluid dynamics method. In general, bubble formation in channels includes three stages: expansion, collapse and pinching off. After analyzing and comparing quantitatively the three forces of pressure, surface tension and shear stress acting on the gas thread in the whole process, their effects in the different stages were identified. The collapse stage was the most important for bubble formation and was investigated in detail. It was found that the collapse process was mostly influenced by the liquid superficial velocity, and the rate and time of collapse can be correlated with empirical equations including the liquid superficial velocity, the capillary number and the Reynolds number.
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