Numerical Simulation of Traveling Wave Dielectrophoretic Pump
Date Issued
2009
Date
2009
Author(s)
Lin, Sin-Yi
Abstract
The work of the thesis is to study numerically a travelling wave dielectrophoretic pump for delivering two-phase suspension conducting fluid, with blood as a model fluid for simulation. Three modifications were made from a previous computer programe.(1)The calculation of source term for exchanging momentum between the suspension and continuum phases was modified from planar to three-dimensional situation, with randomly refill particle for steady state simulation. The samples of the particle calculation were increased by such a modification, and thus more smooth variations of the fileds were were observed.(2)The viscosity is modified by allowing it o be a variable of the local particle concentration,and the resulting pumping velocity is thus dcreased.(3)The effect of the variation of the Clausius-Mossotti factor with particle concentration is included,and the resulting pumping velocity is increased. It is expected that the modified program will provide a better simulation for the real simulation. By performing a simulation with average concerntration 18%, total channel length 1300μm(with an electrode array 720μm at the middle), channel height 60μm,frequency 10MHz, and voltage 5 volts(peak to peak), the average pumping velocity is 28.15μm/s, which is 35% higher than the experimental value, 18μm/s. A preliminary parametric study was carried out for the pump performance. The pump performs better for 20% particle concentration in comparing with 15% situation,for 10MHz frequency in comparing with that at 5MHz, and for case with shorter channel length with fixed a electrode array.
Subjects
travelling wave pump
dep dielectrophoretic force
Type
thesis
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