Figure 2.

Cell velocity analysis in front of a microchannel constriction, where U_EK and U_DEP are the electrokinetic and dielectrophoretic velocities, respectively. $U_{\text{DEP},\vec{s}}$ and $U_{\text{DEP},\vec{n}}$ represent the dielectrophoretic velocity components tangential and normal to a streamline, respectively. The background shows the electric field contour (the darker the higher) and the electric field lines around the constriction region in the absence of cells.