In this research two different topics in the context of Electrohydrodynamics and Biofluid engineering were studied numerically.; In the first part of the thesis, for the purpose of electrostatics design and contamination control of corotrons, the charging element in electro-photographic machines, a commercial finite element code, FIDAP(TM), was modified and by utilizing of the code, electrohydrodynamics of positive single wire corotrons under steady state condition was analyzed. The electrostatics results of the code were favorably compared with the available experimental data and the effects of the design parameters on the electrical quantities and the flow field in and around of the device were investigated through a parametric study. For contamination analysis of the device a computer code based on Eulerian-Lagrangian approach was developed and by using that the trajectories of suspended charged particles and the percentage of the deposited particles on substrate and inner shields of the device for corotrons with different parameters were calculated. The potential topics for the future studies in electrohydrodynamics and particle transport in corotrons were discussed as well.; In the second part of the thesis, the airflow and transport and deposition of spherical nano-size particles in the nasal system of human beings were studied numerically through constructing a 3D computational model from 2D coronal sections of a human subject. The model was constructed in GAMBIT(TM) and the calculations were performed by using FLUENT(TM). The capture efficiency of the nose for particles with different sizes under different breathing rates was calculated through a parametric study and deposition mechanisms based on the particle size and the breathing rates were discussed. The related subjects in continuation of the performed study were introduced as well.
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