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Experimental study was conducted to characterize the flow effect of particle migration in a microchannel which. can be used to deliver small amount of liquids, drugs, biological agents and particles in microfluidic devices. Fluorescent particles of 1-㎛ diameter were used to obtain velocity profiles of the fluid in which large particles of 10-㎛ diameter were suspended at different volume fraction of 0.6 and 0.8%. Measurements were obtained by using micro-PIV system which contains a Nd:YAG laser with a light of 532-㎚ wavelength, an inverted epi-fluorescent microscope and a cooled CCD camera to record particle images. The volume fraction of the particle ø and the particle Reynolds number Rep were used as a parameter to assess the influence of the velocity profile of the suspensions. To expect the slip velocity between the particle and fluids, experiments were carried out at low volume fraction, It was shown that the velocity profile was not influenced by Rep but influenced by the volume fraction, which is in similar trend with the previous study.

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Abstract
1. Introduction
2. Experiment
3. Results and discussion
4. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2009-505-016062796