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Fluid physics around conductive deformable flaps within an induced-charge electrokinetically driven microsystem

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Abstract

The induced-charge electrokinetic motion of a conductive deformable flap (which is installed on the walls of a microchannel) is numerically studied in this article. The relationship between the flap orientation (i.e., vertical, horizontal and oblique positions) and its motion is studied. Stagnation point concept is used to explain the behavior of the flap at different situations. The stagnation point is defined as a point on the flap surface where the induced zeta potential is zero. Thus, the flow velocity at this point becomes zero, and the pressure gradient will be maximum. The direction of the flap motion is determined by the location of the stagnation point. As an example, here, it is shown that the obtuse conductive flap moves in the opposite direction of the flow field because in this case, the stagnation point is located on the back surface of the flap. Interaction of two vertical conductive flaps (located at different distances from each other) is also investigated in this paper. The results indicate that if both of the conductive flaps are fixed on the same microchannel wall, two vortices with opposite spin directions are generated between them. These vortices create a low-pressure zone through which the two flaps attract one another. However, when each flap is fixed on upper and lower microchannel walls, the two vortices with same spin directions are generated between the flaps. These two vortices merge and form a high-pressure zone through which two flaps repel each other.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran

    Shahriar Azimi & Mohsen Nazari

  2. Department of Physics, Ryerson University, Toronto, ON, M5B 2K3, Canada

    Yasaman Daghighi

  3. Institute for Biomedical Engineering, Science and Technology, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Toronto, ON, M5B 1T8, Canada

    Yasaman Daghighi

Authors
  1. Shahriar Azimi
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  2. Mohsen Nazari
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  3. Yasaman Daghighi
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Correspondence to Mohsen Nazari.

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Azimi, S., Nazari, M. & Daghighi, Y. Fluid physics around conductive deformable flaps within an induced-charge electrokinetically driven microsystem. Microfluid Nanofluid 20, 124 (2016). https://doi.org/10.1007/s10404-016-1786-2

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