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Effect of Direct Current Electrowetting on Dielectric on Droplet Impingement Dynamics

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Fluid Mechanics and Fluid Power, Volume 5 (FMFP 2022)

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

Although the impinging dynamics of droplets on solid surfaces has been extensively studied, a complete study on the impact of impinging droplets on direct current electrowetting on dielectric (DC-EWOD) substrates with different configurations of electrodes and voltages is found limited. In order to investigate the dielectric performance and dynamics of EWOD with different voltages, experiments are performed on DC-EWOD. Parametric studies involving droplet diameter, droplet height, applied voltage, electrode spacing, etc., are studied in this work. At a Weber number of 20.02, jetting is inhibited by the application of direct current to the EWOD chip and the droplet shift to one side, and the magnitude of voltages shows a dominant effect on this phenomenon.

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Abbreviations

θ:

Final contact angle (°)

θ0:

Initial contact angle (°)

εr:

Relative permittivity

ε0:

Permittivity of vacuum (F/m)

d:

Dielectric thickness (µm)

γLV:

Surface tension (N/m)

V:

Voltage (V)

We:

Weber number

v:

Characteristic velocity (m/s)

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Acknowledgements

The authors would like to acknowledge CSIR-NIIST Pappanamcode for helping with the fabrication of the EWOD chip.

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Authors and Affiliations

  1. Department of Mechanical Engineering, SchoolofEngineering, Cochin University of Science and Technology, Cochin, Kerala, India

    K. Niju Mohammed, P. S. Tide & Franklin R. John

  2. Micro/Nanofluidics Research Laboratory, CollegeofEngineering, Trivandrum, Kerala, 695016, India

    K. Niju Mohammed, A. Shebin, E. Mohammed Haseeb & Ranjith S. Kumar

  3. Materials Science and Technology Division, CSIR NIIST, Thiruvananthapuram, Kerala, 695019, India

    S. S. Sreejakumari

Authors
  1. K. Niju Mohammed
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  2. A. Shebin
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  3. E. Mohammed Haseeb
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  4. P. S. Tide
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  5. Franklin R. John
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  6. Ranjith S. Kumar
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  7. S. S. Sreejakumari
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Corresponding author

Correspondence to A. Shebin .

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Editors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India

    Krishna Mohan Singh

  2. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India

    Sushanta Dutta

  3. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India

    Sudhakar Subudhi

  4. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India

    Nikhil Kumar Singh

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Niju Mohammed, K. et al. (2024). Effect of Direct Current Electrowetting on Dielectric on Droplet Impingement Dynamics. In: Singh, K.M., Dutta, S., Subudhi, S., Singh, N.K. (eds) Fluid Mechanics and Fluid Power, Volume 5. FMFP 2022. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-6074-3_41

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  • DOI: https://doi.org/10.1007/978-981-99-6074-3_41

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-99-6073-6

  • Online ISBN: 978-981-99-6074-3

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