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3D3C velocimetry measurements of an electrothermal microvortex using wavefront deformation PTV and a single camera

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Abstract

We study the three-dimensional fluid transport in an electrothermal microvortex (EMV), by using wavefront deformation particle-tracking velocimetry (PTV) developed at Universität der Bundeswehr München. By using a cylindrical lens in conjunction with a microscope objective lens, systematic wavefront deformations in the particle images are created. The particles are observed by a single camera and appear as ellipses. The elliptical nature of the particle images encodes out-of-plane information regarding the particle’s position. This new technique is ideally suited for measuring transport in the EMV and provides full three-dimensional, time-resolved particle trajectories with Lagrangian velocity and acceleration. Measurements reveal the toroidal nature of the EMV and the experimentally obtained velocities are used to validate a simplistic model, which describes the interaction between the applied laser illumination and the microfluidic device. The model allows one to conduct numerical simulations of the complex fluid transport in the EMV.

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Acknowledgments

A. Kumar acknowledges support from the Bilsland Dissertation and the Josephine De Kármán Fellowships. Financial support from Deutsche Forschungsgemeinschaft (DFG) in frame of the priority program SPP 1147 is gratefully acknowledged by C. Cierpka.

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Authors and Affiliations

  1. Birck Nanotechnology Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA

    Aloke Kumar & Steven T. Wereley

  2. Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Aloke Kumar

  3. Institut für Strömungsmechanik und Aerodynamik, Universität der Bundeswehr München, 85577, Neubiberg, Germany

    Christian Cierpka & Christian J. Kähler

  4. School of Mechanical Engineering, University of Louisville, Louisville, KY, 40292, USA

    Stuart J. Williams

Authors
  1. Aloke Kumar
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  2. Christian Cierpka
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  3. Stuart J. Williams
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  4. Christian J. Kähler
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  5. Steven T. Wereley
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Corresponding author

Correspondence to Steven T. Wereley.

Electronic supplementary material

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10404_2010_674_MOESM1_ESM.mpg

Supplementary Movie 1: Tracer particles undergo three-dimensional motion. Video is real time. Supplementary material 1 (MPG 4440 kb)

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Kumar, A., Cierpka, C., Williams, S.J. et al. 3D3C velocimetry measurements of an electrothermal microvortex using wavefront deformation PTV and a single camera. Microfluid Nanofluid 10, 355–365 (2011). https://doi.org/10.1007/s10404-010-0674-4

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  • DOI: https://doi.org/10.1007/s10404-010-0674-4

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