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Article overview
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Free radially expanding liquid sheet in air: time- and space-resolved measurement of the thickness field | | Clara Vernay
; Laurence Ramos
; Christian Ligoure
; | | Date: |
12 Dec 2014 | | Abstract: | The collision of a liquid drop against a small target results in the
formation of a thin liquid sheet that extends radially until it reaches a
maximum diameter. The subsequent retraction is due to the air-liquid surface
tension. We have used a time- and space-resolved technique to measure the
thickness field of this class of liquid sheet, based on the grey level
measurement of the image of a dyed liquid sheet recorded using a fast camera.
This method enables a precise measurement of the thickness in the range
$(10-450) , mathrm{mu m}$, with a temporal resolution equal to that of the
camera. We have measured the evolution with time since impact, $t$, and radial
position, $r$, of the thickness, $h(r,t)$, for various drop volumes and impact
velocities. Two asymptotic regimes for the expansion of the sheet are
evidenced. The scalings of the thickness with $t$ and $r$ measured in the two
regimes are those that were predicted in citet{Rozhkov2004} fort the
short-time regime and citet{Villermaux2011} for the long time regime, but
never experimentally measured before. Interestingly, our experimental data also
evidence the existence of a maximum of the film thickness $h_{
m{max}}(r)$ at
a radial position $r_{
m{h_{max}}}(t)$ corresponding to the crossover of these
two asymptotic regimes. The maximum moves with a constant velocity of the order
of the drop impact velocity, as expected theoretically. Thanks to our
visualization technique, we also evidence an azimuthal thickness modulation of
the liquid sheets. | | Source: | arXiv, 1412.3930 | | Services: | Forum | Review | PDF | Favorites | |
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