Plateau-Rayleigh breakup of supercooled refrigerant droplets

Harry Scott, Dung Nguyen, Daniel J. Duke, Damon Honnery

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

This paper presents a new method to produce monodisperse supercooled refrigerant droplets, comparing the breakup mechanism to the Plateau-Rayleigh instability. Formulations of highly volatile species, HFA134a and HFA152a, are cooled to 230K to form a steady unstable liquid column. The breakup of this column is shown to produce a monodisperse droplet stream through back illuminated high-speed imaging (BIHSI) near the tip of the liquid ligament. Theoretical estimates of the most unstable surface jet oscillation frequencies disagree by an order of magnitude. The low surface tension of refrigerant jets may be responsible for the relative amplification of forcing frequencies to critical amplitudes when compared to the theoretical most unstable wavelength and frequency. Near the ligament, volumetric calculations from area projections should be corrected to account for the dominant axial oscillations rather than assuming spherical droplets. Ligament jet velocity estimates from projected droplet area are also shown to agree with experimental results.
Original languageEnglish
Title of host publicationProceedings of 9th Australian Conference on Laser Diagnostics
Publication statusPublished - 2019
EventAustralian Conference on Laser Diagnostics 2019 - Adelaide, Australia
Duration: 2 Dec 20194 Dec 2019
Conference number: 9th
https://www.acld.org.au/

Conference

ConferenceAustralian Conference on Laser Diagnostics 2019
CountryAustralia
CityAdelaide
Period2/12/194/12/19
Internet address

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