Patent ID: 9074974
Filing Date: 2015-07-07
Classification: G01N

Abstract:
1. An apparatus for measuring viscosity comprising: a container disposed with an inlet end and an outlet end while the container is a reducer, and an inlet radius of the inlet end is larger than an outlet radius of the outlet end, and the center of the inlet end and the center of the outlet end are located at the same axis; a fluid placed in the container and having a flow velocity; the fluid has a density value and a pressure gradient value; a pressure controller connected to the inlet end and the outlet end and used for modulating the pressure gradient value of the fluid; and a flow meter that measures the flow velocity; wherein a viscosity value of the fluid is defined by following Expression where, r in and r out respectively is a radius of the inlet end and the outlet end, ρ is fluid density, g is acceleration due to gravity, r, z are two coordinates in a cylindrical coordinate system; I is the height of the container; the ρg and pressure gradient dp/dz are sources that drive the fluid, and (ρg+dp/dz)/4uz represents a driving force per unit of velocity.