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Effect of dissolved gas on bubble growth on a biphilic surface: A diffuse-interface simulation approach
Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI 12CNER, Motooka 744, Fukuoka, Fukuoka 8190395, Japan..
KTH. Royal Inst Technol, Dept Mech, S-10044 Stockholm, Sweden..
Univ Tokyo, Dept Mech Engn, Hongo 7-3-1, Tokyo 1138656, Japan..
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics, Physicochemical Fluid Mechanics.ORCID iD: 0000-0003-3336-1462
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2018 (English)In: International Journal of Heat and Mass Transfer, ISSN 0017-9310, E-ISSN 1879-2189, Vol. 126, p. 816-829Article in journal (Refereed) Published
Abstract [en]

In this paper, we numerically study pool boiling of a binary (water and nitrogen) mixture on a surface endowed with a combination of hydrophobicity and hydrophilicity (i.e., the so called biphilic surface). Here we adopt a numerical approach based on the phase field theory, where the vapor-liquid interface is assumed to be of a finite thickness (hence diffusive in nature) and requires no explicit tracking schemes. The theoretical modeling of two-phase heat and mass transfer in water diluted with nitrogen demonstrates the signiant impact of impurities on bubble dynamics. The simulations show that locally high concentrations of nitrogen gas within the vapor bubble is essential to weakening the condensation effect, which results in sustained bubble growth and ultimately (partial) departure from the surface under the artificially enlarged gravity. Simply increasing the solubility of nitrogen in water, however, turns out to be counterproductive because possible re-dissolution of the aggregated nitrogen by the bulk water could deprive the bubble of vital gas contents, leading instead to continuous bubble shrinkage and collapse. Additionally, it is found that with the significant accumulation of nitrogen, the bubble interface is increasingly dominated by a strong interfacial thermocapillary flow due to the Marangoni effect.

Place, publisher, year, edition, pages
Pergamon Press, 2018. Vol. 126, p. 816-829
Keywords [en]
Boiling, Bubble pinch-off, Binary mixture, Surface wettability, Diffuse-interface method
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-234556DOI: 10.1016/j.ijheatmasstransfer.2018.06.043ISI: 000442972700069Scopus ID: 2-s2.0-85048525356OAI: oai:DiVA.org:kth-234556DiVA, id: diva2:1249398
Note

QC 20180919

Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved

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Liu, JieweiAmberg, GustavDo-Quang, Minh

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KTHLinné Flow Center, FLOWPhysicochemical Fluid Mechanics
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