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Starting jet formation through eversion of elastic sheets

Published online by Cambridge University Press:  04 August 2021

Cheolgyun Jung Open the ORCID record for Cheolgyun Jung [Opens in a new window] ,
Minho Song Open the ORCID record for Minho Song [Opens in a new window]  and
Daegyoum Kim Open the ORCID record for Daegyoum Kim [Opens in a new window]
Cheolgyun Jung
Affiliation:
Department of Mechanical Engineering, KAIST, Daejeon 34141, Republic of Korea
Minho Song
Affiliation:
Department of Mechanical Engineering, KAIST, Daejeon 34141, Republic of Korea
Daegyoum Kim*
Affiliation:
Department of Mechanical Engineering, KAIST, Daejeon 34141, Republic of Korea
*
†Email address for correspondence: daegyoum@kaist.ac.kr
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Abstract

Motivated by biological systems, such as human hearts and the propulsors of aquatic creatures, the interaction between deformable structures and fluid jets has drawn considerable attention to understand the mechanism of effective fluid transport through such jets. In this study, the formation of a starting jet through a novel eversion process is investigated experimentally using a simple vortex generator model with everted sheets. The ends of two everted sheets are clamped at either side of a rectangular flow channel, with the other free ends in contact with each other in the middle of the channel. Geometric and kinematic parameters, such as the length and bending rigidity of the everting sheets and the speed of the piston, are varied to examine their effects on the deformation of the sheets and the formation of the jet. By introducing a dimensionless bending rigidity, the behaviour of the sheets during the eversion process can be correlated with jet characteristics such as the velocity profile and hydrodynamic impulse. The interaction between the starting jet and the everting sheets enables a notably faster jet with an improved hydrodynamic impulse to be developed within a shorter stroke time.

JFM classification

Wakes/Jets: Jets Vortex Flows: Vortex dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 924 , 10 October 2021 , A7
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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