ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Electro-Magneto-Hydrodynamics of Shear Driven Microscale Flows
Abstract
Electromagnetic field actuated flows within microchannels is of significant importance in the field of microfluidics. In the
present work, a mathematical model is derived for the micro scale electroosmotic Couette flow under the influence of
combined electromagnetic field. Combined effects of longitudinal and lateral electric fields along with vertical
magnetic field are taken into account while solving the
governing equations of fluid flow. Velocity profiles under the
varying influence of parameters like electromagnetic force and
electroviscous number are shown. The overall flow rate
enhancement in the presence of electromagnetic effect is noted
up to the value of Hartmann number (Ha) = 1.5, beyond which the flow rate is observed to decrease. Hence, the magnetic field effect proves to be beneficial only up to a certain magnitude. The flow is noted to augment always with increase in the transverse electric field. It is also observed that after a certain value of the upper plate velocity, the shear force plays the dominant role and there is no enhancement in the flow rate due to the electromagnetic field. The findings may prove significant for design and development of microscale shear flow actuation technologies.