Luminescence from cavitation bubbles deformed in uniform pressure gradients

Outi Supponen, Danail Obreschkow, Philippe Kobel, Mohamed Farhat

Research output: Contribution to journalArticle

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Abstract

Presented here are observations that demonstrate how the deformation of millimetric cavitation bubbles by a uniform pressure gradient quenches single-collapse luminescence. Our innovative measurement system captures a broad luminescence spectrum (wavelength range, 300-900 nm) from the individual collapses of laser-induced bubbles in water. By varying the bubble size, driving pressure, and perceived gravity level aboard parabolic flights, we probed the limit from aspherical to highly spherical bubble collapses. Luminescence was detected for bubbles of maximum radii within the previously uncovered range, R0=1.5-6 mm, for laser-induced bubbles. The relative luminescence energy was found to rapidly decrease as a function of the bubble asymmetry quantified by the anisotropy parameter ζ, which is the dimensionless equivalent of the Kelvin impulse. As established previously, ζ also dictates the characteristic parameters of bubble-driven microjets. The threshold of ζ beyond which no luminescence is observed in our experiment closely coincides with the threshold where the microjets visibly pierce the bubble and drive a vapor jet during the rebound. The individual fitted blackbody temperatures range between Tlum=7000 and Tlum=11500 K but do not show any clear trend as a function of ζ. Time-resolved measurements using a high-speed photodetector disclose multiple luminescence events at each bubble collapse. The averaged full width at half-maximum of the pulse is found to scale with R0 and to range between 10 and 20 ns.

LanguageEnglish
Article number033114
Pages033114-1 - 033114-12
JournalPhysical Review E
Volume96
Issue number3
DOIs
StatePublished - 25 Sep 2017

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Cavitation
Luminescence
Pressure Gradient
cavitation flow
pressure gradients
Bubble
bubbles
luminescence
Range of data
vapor jets
parabolic flight
Laser
Rebound
Blackbody
thresholds
Kelvin
Photodetector
Measurement System
Dimensionless
Impulse

Cite this

Supponen, O., Obreschkow, D., Kobel, P., & Farhat, M. (2017). Luminescence from cavitation bubbles deformed in uniform pressure gradients. Physical Review E, 96(3), 033114-1 - 033114-12. [033114]. DOI: 10.1103/PhysRevE.96.033114
Supponen, Outi ; Obreschkow, Danail ; Kobel, Philippe ; Farhat, Mohamed. / Luminescence from cavitation bubbles deformed in uniform pressure gradients. In: Physical Review E. 2017 ; Vol. 96, No. 3. pp. 033114-1 - 033114-12
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Supponen, O, Obreschkow, D, Kobel, P & Farhat, M 2017, 'Luminescence from cavitation bubbles deformed in uniform pressure gradients' Physical Review E, vol 96, no. 3, 033114, pp. 033114-1 - 033114-12. DOI: 10.1103/PhysRevE.96.033114

Luminescence from cavitation bubbles deformed in uniform pressure gradients. / Supponen, Outi; Obreschkow, Danail; Kobel, Philippe; Farhat, Mohamed.

In: Physical Review E, Vol. 96, No. 3, 033114, 25.09.2017, p. 033114-1 - 033114-12.

Research output: Contribution to journalArticle

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Supponen O, Obreschkow D, Kobel P, Farhat M. Luminescence from cavitation bubbles deformed in uniform pressure gradients. Physical Review E. 2017 Sep 25;96(3):033114-1 - 033114-12. 033114. Available from, DOI: 10.1103/PhysRevE.96.033114