In this paper, we numerically investigated electrohydrodynamic flows generated inside droplets undergoing electrowetting. We prove that interfacial shear stresses at the droplet interface are capable, alone, of generating internal electrohydrodynamic flow inside the droplet contrary to previous reports which refer such flows to electrothermal effects. The obtained fluid flow pattern agrees well with previously reported experimental results at the low frequency range of 8∼15 kHz where the effect of all other phenomena (electrothermal, Marangoni, oscillation) are negligible. We studied the effect of applied voltage, frequency, and electrical conductivity of the droplet on the magnitude of the velocity of generated flows. The results obtained will be useful in choosing best conditions to enhance mixing inside droplets while at the same time avoiding temperature rise associated with electrothermal flows which are incompatible with some biological applications.
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ASME 2015 International Mechanical Engineering Congress and Exposition
November 13–19, 2015
Houston, Texas, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5747-2
PROCEEDINGS PAPER
Interfacial Electrical Shear Stresses Induce Electrohydrodynamic Flows Inside Droplets Actuated by Electrowetting Available to Purchase
W. M. Salman,
W. M. Salman
Assiut University, Assiut, Egypt
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M. S. Abdelsalam,
M. S. Abdelsalam
Assiut University, Assiut, Egypt
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M. F. F. El-Dosoky,
M. F. F. El-Dosoky
Assiut University, Assiut, Egypt
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M. Abdelgawad
M. Abdelgawad
Assiut University, Assiut, Egypt
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W. M. Salman
Assiut University, Assiut, Egypt
H. A. Ali
Assiut University, Assiut, Egypt
M. S. Abdelsalam
Assiut University, Assiut, Egypt
M. F. F. El-Dosoky
Assiut University, Assiut, Egypt
M. Abdelgawad
Assiut University, Assiut, Egypt
Paper No:
IMECE2015-51579, V07BT09A006; 5 pages
Published Online:
March 7, 2016
Citation
Salman, WM, Ali, HA, Abdelsalam, MS, El-Dosoky, MFF, & Abdelgawad, M. "Interfacial Electrical Shear Stresses Induce Electrohydrodynamic Flows Inside Droplets Actuated by Electrowetting." Proceedings of the ASME 2015 International Mechanical Engineering Congress and Exposition. Volume 7B: Fluids Engineering Systems and Technologies. Houston, Texas, USA. November 13–19, 2015. V07BT09A006. ASME. https://doi.org/10.1115/IMECE2015-51579
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