Optimal operating conditions for capillary breakup rheometry based on half-times of liquid bridges

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Abstract

McDonnell et al. [1] recently proposed a novel microfluidic capillary breakup extensional rheometer. In this device, the time taken for the mid filament radius of a liquid bridge to thin to half its initial value is used with a calibration curve to obtain the extensional viscosity of nanolitresized sample drops. In this study, we use simulations of liquid bridges to show that the bridge aspect ratio and sample volume strongly influence bridge half-times and the shapes of calibration curves. It is observed that the breakup slows down considerably as these parameters approach the region for stable liquid bridges. In addition to this, satellite drops can begin to form for very slender bridges, in which case a halftime can be difficult to define. We find the optimal operating conditions for the halftime method that avoid these difficulties.

Original languageEnglish
Title of host publication22nd Australasian Fluid Mechanics Conference, AFMC 2020
EditorsHubert Chanson, Richard Brown
PublisherAustralasian Fluid Mechanics Society
Pages1-4
Number of pages4
ISBN (Electronic)9781742723419
DOIs
Publication statusPublished - 2020
EventAustralasian Fluid Mechanics Conference 2020 - Brisbane, Australia
Duration: 7 Dec 202010 Dec 2020
Conference number: 22nd
https://afmc2020.org

Conference

ConferenceAustralasian Fluid Mechanics Conference 2020
Abbreviated titleAFMC 2020
Country/TerritoryAustralia
CityBrisbane
Period7/12/2010/12/20
Internet address

Keywords

  • capillary
  • Liquid bridge
  • rheometry
  • slender filaments

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