TY - JFULL
AU - Malcolm R Davidson and Ram P. Bharti and Petar Liovic and Dalton J.E. Harvie
PY - 2008/5/
TI - Electroviscous Effects in Low Reynolds Number Flow through a Microfluidic Contraction with Rectangular Cross-Section
T2 - International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering
SP - 39
EP - 44
EM - m.davidson@unimelb.edu.au, prakashr@unimelb.edu.au,pliovic@unimelb.edu.au, daltonh@unimelb.edu.au
VL - 2
SN - 1307-6892
UR - http://waset.org/publications/8940
PU - World Academy of Science, Engineering and Technology
NX - International Science Index 16, 2008
N2 - The electrokinetic flow resistance (electroviscous
effect) is predicted for steady state, pressure-driven liquid flow at
low Reynolds number in a microfluidic contraction of rectangular
cross-section. 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 1:1 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 counter-ions in the liquid is greater than that in
corresponding two-dimensional slit-like contraction geometry. The
apparent viscosity is found to be very close to the value for a
rectangular channel of uniform cross-section 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.
ER -