Fig. 3.

Design of a single capillary flow phantom. (a) Layout of the hydrodynamic focusing microfluidic device for capillary flow simulation, where the two side sheath fluids hydrodynamically focus the blood cell suspension from blood reservoir to form a single-file flow. (b) Top view of the fabricated microfluidic device. (c) Illustration of the device fabrication process. (d) COMSOL simulation result of flow velocity distribution in the microflow channels for the inlet/outlet pumping flow rate of 10/10.8μl.