Patent ID: 9176040
Filing Date: 2015-11-03
Classification: G01N

Abstract:
1. An apparatus for measuring viscosity comprising: a container having an inlet end and an outlet end, a radius of the inlet end is larger than a radius of the outlet end while the container is a vertical reducer, the container containing a fluid under measuring, the fluid having a density value ρ and a pressure gradient value dp/dz, placed within the container, and flowing out of the outlet end at a flow rate value a pressure controller connected to both the inlet end and the outlet end, and modulating an inlet pressure value of the fluid at the inlet end and modulating an outlet pressure value of the fluid at the outlet end to modulate the pressure gradient value dp/dz of the fluid according to the inlet pressure value, the outlet pressure value and a height of the container; a graduated cylinder, disposed under the outlet end, for measuring a volume of the fluid flowing out of the outlet end while the fluid is discharged from the outlet end; and a timer, measuring a time during the fluid flowing out of the outlet end while the flow rate value a microprocessor that calculates a viscosity value μ of the fluid is defined by following Expression; where, g is gravity, γ out is a radius of the outlet end.