Extensional flow of low-viscosity fluids in capillary bridges formed by pulsed surface acoustic wave jetting

Details Extensional flow of low-viscosity fluids in capillary bridges formed by pulsed surface acoustic wave jetting Extensional flow of low-viscosity fluids in capillary bridges formed by pulsed surface acoustic wave jetting

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13b3005b&link_type=abstract

New Journal of Physics, Volume 13, Issue 2, pp. 023005 (2011).

Physics

1

Scientific paper

Forming capillary bridges of low-viscosity (lsim10 mPa s) fluids is difficult, making the study of their capillary-thinning behavior and the measurement of the fluid's extensional viscosity difficult as well. Current techniques require some time to form a liquid bridge from the stretching of a droplet. Rapidly stretching a liquid bridge using these methods can cause its breakup if the viscosity is too low. Stretching more slowly allows the bridge to thin and break up before a suitable bridge geometry can be established to provide reliable and accurate rheological data. Using a pulsed surface acoustic wave to eject a jet from a sessile droplet, a capillary bridge may be formed in about 7.5 ms, about seven times quicker than current methods. With this approach, capillary bridges may be formed from Newtonian and non-Newtonian fluids having much lower viscosities—water, 0.04% by weight solution of high-molecular-weight (7 MDa) polystyrene in dioctyl phthalate and 0.25% fibrinogen solution in demineralized water, for example. Details of the relatively simple system used to achieve these results are provided, as are experimental results indicating deviations from a Newtonian response by the low-viscosity non-Newtonian fluids used in our study.

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