http://www.cnr.it/ontology/cnr/individuo/prodotto/ID182476
History force on coated microbubbles propelled by ultrasound (Articolo in rivista)
- Type
- Label
- History force on coated microbubbles propelled by ultrasound (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.3227903 (literal)
- Alternative label
Garbin, V; Dollet, B; Overvelde, M; Cojoc, D; Di Fabrizio, E; van Wijngaarden, L; Prosperetti, A; de Jong, N; Lohse, D; Versluis, M (2009)
History force on coated microbubbles propelled by ultrasound
in Physics of fluids (1994)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Garbin, V; Dollet, B; Overvelde, M; Cojoc, D; Di Fabrizio, E; van Wijngaarden, L; Prosperetti, A; de Jong, N; Lohse, D; Versluis, M (literal)
- Pagina inizio
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- http://pof.aip.org/resource/1/phfle6/v21/i9/p092003_s1 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
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- Note
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- a Physics of Fluids Group, Research Institute for Biomedical Technology BMTI, University of Twente, 7500 AE Enschede, Netherlands
b CNR-INFM, Laboratorio Nazionale TASC, 34149 Trieste, Italy
c Institut de Physique de Rennes, CNRS, Université Rennes 1, 35042 Rennes, France
d Laboratorio BIONEM, Università Magna Græcia di Catanzaro, 88100 Germaneto, Italy
e Italy and Nanobiotech Laboratory, Italian Institute of Technology, 16163 Genova, Italy
f Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, United States
g Erasmus Medical Center, 3000 Rotterdam, Netherlands (literal)
- Titolo
- History force on coated microbubbles propelled by ultrasound (literal)
- Abstract
- In this paper the unsteady translation of coated microbubbles propelled by acoustic radiation force
is studied experimentally. A system of two pulsating microbubbles of the type used as contrast agent
in ultrasound medical imaging is considered, which attract each other as a result of the secondary
Bjerknes force. Optical tweezers are used to isolate the bubble pair from neighboring boundaries so
that it can be regarded as if in an unbounded fluid and the hydrodynamic forces acting on the system
can be identified unambiguously. The radial and translational dynamics, excited by a 2.25 MHz
ultrasound wave, is recorded with an ultrahigh speed camera at 15?106 frames/ s. The
time-resolved measurements reveal a quasisteady component of the translational velocity, at an
average translational Reynolds number ?Ret??0.5, and an oscillatory component at the same
frequency as the radial pulsations, as predicted by existing models. Since the coating enforces a
no-slip boundary condition, an increased viscous dissipation is expected due to the oscillatory
component, similar to the case of an oscillating rigid sphere that was first described by Stokes ?\"On
the effect of the internal friction of fluids on the motion of pendulums,\" Trans. Cambridge Philos.
Soc. 9, 8 ?1851??. A history force term is therefore included in the force balance, in the form
originally proposed by Basset and extended to the case of time-dependent radius by Takemura and
Magnaudet ?\"The history force on a rapidly shrinking bubble rising at finite Reynolds number,\"
Phys. Fluids 16, 3247 ?2004??. The instantaneous values of the hydrodynamic forces extracted from
the experimental data confirm that the history force accounts for the largest part of the viscous force.
The trajectories of the bubbles predicted by numerically solving the equations of motion are in very
good agreement with the experiment. (literal)
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