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Contribution of Ultra-Fine Bubbles to Promoting Effect on Propane Hydrate Formation

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Title: Contribution of Ultra-Fine Bubbles to Promoting Effect on Propane Hydrate Formation
Authors: Uchida, Tsutomu Browse this author →KAKEN DB
Miyoshi, Hiroshi Browse this author
Sugibuchi, Ren Browse this author
Suzuta, Akio Browse this author
Yamazaki, Kenji Browse this author
Gohara, Kazutoshi Browse this author →KAKEN DB
Keywords: nanobubble
number density
memory effect
induction time
Issue Date: 5-Jun-2020
Publisher: Frontiers Media
Journal Title: Frontiers in Chemistry
Volume: 8
Start Page: 480
Publisher DOI: 10.3389/fchem.2020.00480
Abstract: To investigate experimentally how ultra-fine bubbles (UFBs) may promote hydrate formation, we examined the formation of propane (C3H8) hydrate from UFB-infused water solution using two preparation methods. In one method, we used C3H8-hydrate dissociated water, and in the other, C3H8-UFB-included water prepared with a generator. In both solutions, the initial conditions had a UFB number density of up to 10(9)mL(-1). This number density decreased by only about a half when stored at room temperature for 2 days, indicating that enough amount of UFBs were stably present at least during the formation experiments. Compared to the case without UFBs, the nucleation probabilities within 50 h were similar to 1.3 times higher with the UFBs, and the induction times, the time period required for the bulk hydrate formation, were significantly shortened. These results confirmed that UFB-containing water promotes C3H8-hydrate formation. Combined with the UFB-stability experiments, we conclude that a high number density of UFBs in water contributes to the hydrate promoting effect. Also, consistent with previous research, the present study on C(3)H(8)hydrates showed that the promoting effect would occur even in water that had not experienced any hydrate structures. Applying these findings to the debate over the promoting (or "memory") effect of gas hydrates, we argue that the gas dissolution hypothesis is the more likely explanation for the effect.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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