Photothermally controlled Marangoni flow around a micro bubble

Namura, Kyoko; Nakajima, K.; Kimura, Kenji; Suzuki, Motofumi

doi:10.1063/1.4906929

Cited by 90 publications

(94 citation statements)

References 31 publications

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“…Quantification of the flow field and visualization of the convective structure of these instabilities has been the subject of several studies since the seminal work of Bénard [12] who observed a regular pattern of convective cells inside an evaporating thin liquid film with a free upper surface that was heated from the bottom. This observation, which was attributed to the density variation inside the liquid at that time but was thought to be the result of a surface tension gradient a few decades later [13,14], has hitherto been the inspiration behind several experimental [15,16], analytical [17,18] and numerical [19][20][21] studies.…”

Section: Introductionmentioning

confidence: 96%

Three-Dimensional Reconstruction of Evaporation-Induced Instabilities Using Volumetric Scanning Particle Image Velocimetry

Kazemi

Elliott

Nobes

2020

Optics

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The three-dimensional (3D) flow below the interface of an evaporating liquid at a low pressure is visualized and quantified using scanning particle image velocimetry. The technique presented highlights the use of a single camera and a relatively fast moving laser sheet to image the flow for an application where using more than one camera is difficult. The technique allows collection of the full three-dimensional velocity vector map over the whole liquid volume. The out-of-plane component of the velocity has been determined using two different processing approaches: (i) deriving the full vector from a 3D cross-correlation of the particle volumes and (ii) applying the continuity equation to determine out-of-plane velocities from the calculated in-plane velocity vector fields. The results obtained from both methods showed good agreement with each other. The 3D velocity field reveals the existence of a torus shaped vortex below the evaporating meniscus that was induced by the exposure of the cold liquid to the warmer solid walls. The velocity data also shows that the maximum velocity occurs below the interface, not at the interface which highlights that the observed vortex is not driven by thermocapillary forces that usually govern the flow during evaporation at smaller scales.

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Section: Introductionmentioning

confidence: 96%

Three-Dimensional Reconstruction of Evaporation-Induced Instabilities Using Volumetric Scanning Particle Image Velocimetry

Kazemi

Elliott

Nobes

2020

Optics

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“…9 Recently, we demonstrated generation of rapid Marangoni vortex flows around a micro bubble using the thermoplasmonic effect of gold nanoparticles under laser illumination. 10 As a light absorbing layer, a thin film with two-dimensional gold nanoparticle array is prepared on the bottom surface of a narrow parallel plane channel. By focusing a laser onto the film, a micro bubble is created in the channel filled with water.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic control on nano-plasmonic thin films using Marangoni effect

Namura¹,

Nakajima²,

Kimura³

et al. 2015

SPIE Proceedings

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In this study, we demonstrate the rapid switching of flow direction in a narrow parallel plate channel filled with water by using the thermoplasmonic Marangoni effect. A gold island film prepared in the channel is used as a thermoplasmonic heater, on which a continuous wave (CW) laser is focused to generate a micro bubble. By displacing the laser spot from the bubble center, Marangoni vortex flows are developed adjacent to the bubble. The direction of the observed flow significantly changes depending on the applied laser power. When the laser power is square-wave modulated at 5 Hz, the flow direction instantaneously switches in response to the power, and polystyrene microspheres dispersed in the water are arranged in a discrete pattern. The flow direction switching is observed for laser power modulation frequency of up to 40 Hz, which indicates that the time constant of the flow direction switching is at least of the order of several milliseconds. This rapid flow direction switching is attributed to the fast response of both the thermoplasmonic effect of the gold nanoparticles and the Marangoni effect on the bubble surface. Consequently, the thermoplasmonic Marangoni flows are useful for the dynamic and flexible flow control and microparticle manipulation in a microfluidic channel.

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“…Due to the significance of Marangoni flow in practical engineering, the investigation of this subject is attracting an increasing amount of experts and scholars. The basic mechanism and the heat transfer process of Marangoni boundary layer flow have been extensively investigated in many literatures . The nanofluid of Marangoni convection on various occasions has been investigated .…”

Section: Introductionmentioning

confidence: 99%

“…The basic mechanism and the heat transfer process of Marangoni boundary layer flow have been extensively investigated in many literatures. [40][41][42] The nanofluid of Marangoni convection on various occasions has been investigated. [43][44][45] Lin and colleagues 46 and Ellahi and colleagues 47 presented research on particle shape effects on Marangoni convection boundary layer flow of a nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Cattaneo–Christov heat flux model for heat transfer of Marangoni boundary layer flow in a copper–water nanofluid

Chen

2017

Heat Trans. Asian Res.

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The Cattaneo–Christov heat flux is first utilized to explore the heat transfer characteristics of Marangoni boundary layer flow in a copper–water nanofluid. The Marangoni boundary layer flow is driven by exponential temperature. Five different types of nanoparticle shapes including sphere, hexahedron, tetrahedron, column and lamina are considered for the copper–water nanofluid. The nonlinear system of partial differential equations is reduced by similarity transformations and then solved numerically by the shooting method. It is found that sphere nanoparticle has better heat transfer enhancement than other nanoparticle shapes and both the temperature and the thickness of the thermal boundary layer are lower for the Cattaneo–Christov heat flux model than the classical Fourier's law of heat conduction.

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Photothermally controlled Marangoni flow around a micro bubble

Cited by 90 publications

References 31 publications

Three-Dimensional Reconstruction of Evaporation-Induced Instabilities Using Volumetric Scanning Particle Image Velocimetry

Three-Dimensional Reconstruction of Evaporation-Induced Instabilities Using Volumetric Scanning Particle Image Velocimetry

Microfluidic control on nano-plasmonic thin films using Marangoni effect

Cattaneo–Christov heat flux model for heat transfer of Marangoni boundary layer flow in a copper–water nanofluid

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