- Hele Shaw Cell : Selective-Mixing-on-a-Chip
Chaotic advection by an oscillating a Stokeslet in a Stokes flow confined in a circular Hele-Shaw cell is determined. Complex flow patterns as a function of the initial position of the Stokeslet and its strength is given. Results have shown that, efficient mixing can be achieved by chaotic paths induced by oscillating a Stokeslet. A new concept of selective mixing is introduced and has named as "Selective-Mixing-on-a-Chip". The later shows that using a point force as an exciter to the base Stokes flow, the ability of controlling and selective mixing between different passive fluids with one another and the background flow is realized.
Chaotic advection by an oscillating a Stokeslet in a Stokes flow confined in a circular Hele-Shaw cell is determined. Complex flow patterns as a function of the initial position of the Stokeslet and its strength is given. Results have shown that, efficient mixing can be achieved by chaotic paths induced by oscillating a Stokeslet. A new concept of selective mixing is introduced and has named as "Selective-Mixing-on-a-Chip". The later shows that using a point force as an exciter to the base Stokes flow, the ability of controlling and selective mixing between different passive fluids with one another and the background flow is realized.
- Electroosmotic Flow : Complex Flow Patterns
Complex electroosmotic flow patterns induced by imposing external electric potentials on an electrolyte fluid contained in a microchannel with uniform and spatially-variable (sinusoidal) surface charges are given in this article. The two-dimensional Navier-Stokes equations coupled with the electric potential equations are solved to generate various flow patterns in the limit of the Stokes flow regime . The coupled system of equations was re-formulated using the vorticity-stream function formulations and have been solved numerically using a second order accurate finite differencing method. Two main groups of cases based on the external potential distributions that assigned to both top and bottom walls are investigated in details. Results have shown that, a simple surface charge distribution can lead to complex flow patterns.
Complex electroosmotic flow patterns induced by imposing external electric potentials on an electrolyte fluid contained in a microchannel with uniform and spatially-variable (sinusoidal) surface charges are given in this article. The two-dimensional Navier-Stokes equations coupled with the electric potential equations are solved to generate various flow patterns in the limit of the Stokes flow regime . The coupled system of equations was re-formulated using the vorticity-stream function formulations and have been solved numerically using a second order accurate finite differencing method. Two main groups of cases based on the external potential distributions that assigned to both top and bottom walls are investigated in details. Results have shown that, a simple surface charge distribution can lead to complex flow patterns.
- Bio-Mass Sensor using Microcantilever
The project has focused on the dynamic analysis of a bio-mass sensor. The main component of this microsystem is a cantilever beam placed in a vacuum microchannel with a proof mass attached to its
end. The rigid mass is coupled to an electrode to capacitively drive the beam. The operating principle is based on detecting the shift in resonance frequency to measure the mass of a cell depositing on the sensing tip. We show that the present system enables easy detection and measurement of the added mass. To gain insight into the
microsystem sensitivity to variations in its parameters, such as the gap distance and tip mass, as well as the use of higher-order modes, we examine their effects on the variation of resonance frequency shift with respect to the added mass.
The project has focused on the dynamic analysis of a bio-mass sensor. The main component of this microsystem is a cantilever beam placed in a vacuum microchannel with a proof mass attached to its
end. The rigid mass is coupled to an electrode to capacitively drive the beam. The operating principle is based on detecting the shift in resonance frequency to measure the mass of a cell depositing on the sensing tip. We show that the present system enables easy detection and measurement of the added mass. To gain insight into the
microsystem sensitivity to variations in its parameters, such as the gap distance and tip mass, as well as the use of higher-order modes, we examine their effects on the variation of resonance frequency shift with respect to the added mass.
- Stokes Flow over Microorganisms
The flow over microorganisms with cilia micropatterns structures are given. The method of regularized Stokeslets meshfree method are used.
The flow over microorganisms with cilia micropatterns structures are given. The method of regularized Stokeslets meshfree method are used.