Figure 7
Predicted mixing time tmix versus the sheath to sample flow rate ratio Qsh/Qsa (bottom abscissa) and expanded sample stream diameter in the polyimide capillary (top abscissa). The sample stream diameter in the polyimide capillary region of the mixer, for a fixed geometry, is governed by Qsh/Qsa. The explored operational regime assumed a fixed initial sheath to sample concentration ratio csh,0/csa,0 of 5. Further, the sample and sheath species have diffusivities, respectively, of 0.425 and 1.05 × 10−9 m2 s−1. |