Skip to Main Content
This paper reports an efficient method to measure fluid viscosity in microchannels using hydrodynamic diverging chamber and digital counting. A proposed microfluidic viscometer is designed to have two inlets for sample as well as reference fluids, and a divergencing channel with 89 channels for digital counting. DI water and SDS solutions are used as a reference fluid and a sample fluid, respectively. The viscosities measured by the proposed microfluidic viscometer are compared with the ones measured by a commercially available viscometer (HAAKE MARS). The averaged deviation for four different viscosities measured by both viscometers is only about 2.5 %. Additionally, the microfluidic viscometer gives more consistent value, especially in low shear rate regime.