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Air flow in a collapsing cavity

Air flow in a collapsing cavity
Air flow in a collapsing cavity
We experimentally study the airflow in a collapsing cavity created by the impact of a circular disc on a water surface. We measure the air velocity in the collapsing neck in two ways: Directly, by means of employing particle image velocimetry of smoke injected into the cavity and indirectly, by determining the time rate of change of the volume of the cavity at pinch-off and deducing the air flow in the neck under the assumption that the air is incompressible. We compare our experiments to boundary integral simulations and show that close to the moment of pinch-off, compressibility of the air starts to play a crucial role in the behavior of the cavity. Finally, we measure how the air flow rate at pinch-off depends on the Froude number and explain the observed dependence using a theoretical model of the cavity collapse.
1070-6631
1-14
Peters, Ivo R.
222d846e-e620-4017-84cb-099b14ff2d75
Gekle, Stephan
828bf58e-4a60-4d0c-a26e-0200b2a4d577
Lohse, Detlef
a4e72495-4a7c-4f36-b482-6066cb11797a
van der Meer, Devaraj
54e00557-0050-43f5-9efb-a28ea962591c
Peters, Ivo R.
222d846e-e620-4017-84cb-099b14ff2d75
Gekle, Stephan
828bf58e-4a60-4d0c-a26e-0200b2a4d577
Lohse, Detlef
a4e72495-4a7c-4f36-b482-6066cb11797a
van der Meer, Devaraj
54e00557-0050-43f5-9efb-a28ea962591c

Peters, Ivo R., Gekle, Stephan, Lohse, Detlef and van der Meer, Devaraj (2013) Air flow in a collapsing cavity. Physics of Fluids, 25 (3), 1-14. (doi:10.1063/1.4794125).

Record type: Article

Abstract

We experimentally study the airflow in a collapsing cavity created by the impact of a circular disc on a water surface. We measure the air velocity in the collapsing neck in two ways: Directly, by means of employing particle image velocimetry of smoke injected into the cavity and indirectly, by determining the time rate of change of the volume of the cavity at pinch-off and deducing the air flow in the neck under the assumption that the air is incompressible. We compare our experiments to boundary integral simulations and show that close to the moment of pinch-off, compressibility of the air starts to play a crucial role in the behavior of the cavity. Finally, we measure how the air flow rate at pinch-off depends on the Froude number and explain the observed dependence using a theoretical model of the cavity collapse.

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Accepted/In Press date: 13 February 2013
e-pub ahead of print date: 13 March 2013
Published date: March 2013
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 399966
URI: http://eprints.soton.ac.uk/id/eprint/399966
ISSN: 1070-6631
PURE UUID: 6cf352bb-15d9-4e0a-924f-59b1417c08f2
ORCID for Ivo R. Peters: ORCID iD orcid.org/0000-0002-3549-3322

Catalogue record

Date deposited: 08 Sep 2016 15:57
Last modified: 22 Nov 2021 03:08

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Contributors

Author: Ivo R. Peters ORCID iD
Author: Stephan Gekle
Author: Detlef Lohse
Author: Devaraj van der Meer

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