Pumping electrolyte fluid using focal light and electric  field in rectangular microchannel

Kiani-Iranpour, R; Rasuli, S N

doi:10.47176/ijpr.20.1.39821

Pumping electrolyte fluid using focal light and electric field in rectangular microchannel

Document Type : Original Article

Authors

R Kiani-Iranpour ¹

S N Rasuli ²

¹ Department of Physics, University of Guilan, Guilan, Iran

² 1. Department of Physics, University of Guilan, Guilan, Iran 2. School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran

https://doi.org/10.47176/ijpr.20.1.39821

Abstract

The absorption of the focused light inside aqueous electrolyte locally heats it; thus, it creates a temperature field and temperature gradient around the light-absorbing region. Due to a phenomenon known as Soret effect, positive and negative ions move in the presence of the temperature field toward the warmer or cooler region. However, this tendency and its corresponding motion are not the same for two types of ions; therefore, it ends up with a locally charged region. This means creating a pure electric charge suspended in the light absorption area. Applying an external electric field to the fluid then exerts a force to the net charge and its surrounding fluid, resulting in the fluid’s motion. We investigate this problem for an electrolyte fluid enclosed between two parallel transparent dielectric blades closely located to each other. Based on analytic and finite element methods, we calculate the temperature field created by the Gaussian beam inside and outside the electrolyte. We then obtain its induced electric potential and charge density. Finally, we calculate the fluid velocity field and the total induced current. The analytical and numerical results well verify each other.

Keywords

microfluidics

micropump

Soret effect

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