2014 Fiscal Year Final Research Report
Elucidation of formation mechanism of crystal nucleus by using dissolution and shrinkage of a microbubble
| Project/Area Number |
25820389
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Reaction engineering/Process system
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Keywords | microbubble / dissolution / shrinkage |
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| Outline of Final Research Achievements |
Gas-liquid flow was investigated in flow-focusing type microchannel to study dissolution and shrinkage of microbubbles in detail. A flow pattern map was proposed by varying flow rates of gas and liquid. Condition for stable formation of microbubbles was elucidated. Distribution of dissolved gas was visualized by using the oxygen-sensitive dye. It was confirmed that locally high dissolved gas concentration area was formed around a microbubble by fast dissolution and shrinkage of the microbubble. Moreover, the effects of operational conditions on dissolution and shrinkage rate were investigated. Increase in pressure and/or decrease in initial dissolved gas concentration enhanced fast dissolution of microbubbles. Finally, a mathematical model was considered to estimate the time course of diameter of dissolving and shrinking microbubble. Calculation results from this model showed good agreement with measured values.
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| Free Research Field |
化学工学
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