Malcolm R Davidson and Ram P. Bharti and Petar Liovic and Dalton J.E. Harvie
Electroviscous Effects in Low Reynolds Number Flow through a Microfluidic Contraction with Rectangular CrossSection
40 - 44
2008
2
4
International Journal of Chemical and Molecular Engineering
https://publications.waset.org/pdf/8940
https://publications.waset.org/vol/16
World Academy of Science, Engineering and Technology
The electrokinetic flow resistance (electroviscous
effect) is predicted for steady state, pressuredriven liquid flow at
low Reynolds number in a microfluidic contraction of rectangular
crosssection. Calculations of the three dimensional flow are
performed in parallel using a finite volume numerical method. The
channel walls are assumed to carry a uniform charge density and the
liquid is taken to be a symmetric 11 electrolyte. Predictions are
presented for a single set of flow and electrokinetic parameters. It is
shown that the magnitude of the streaming potential gradient and the
charge density of counterions in the liquid is greater than that in
corresponding twodimensional slitlike contraction geometry. The
apparent viscosity is found to be very close to the value for a
rectangular channel of uniform crosssection at the chosen Reynolds
number (Re 0.1). It is speculated that the apparent viscosity for the
contraction geometry will increase as the Reynolds number is
reduced.
Open Science Index 16, 2008