PURPOSE: To measure the viscosity of a high pressure fluid such as coal slurry by applying vibration to a vibration rod vertical thereto so that a seal section constitutes the node thereof after the vibration rod having a vibrator is inserted into a tube wall through which the fluid flows.
CONSTITUTION: A housing case 31 is fixed to a tube 1 through which a high presure fluid such as coal slurry and a vibration rod 34 with a rectangular-plate- shaped vibrator 34a at the tip thereof is inserted thereinto. A vibration coil 36 and a displacement sensor 37 are provided at the upper end of the rod 34. As the vibration rod 34 is vibrated with the vibration coil 36 perpendicular to the axial direction thereof 34 and so that a seal member 32 constitutes a node, the vibration is damped with a viscous resistance of the fluid and the amplitude E thereof is detected with a displacement sensor 37. The ratio is determined between the amplitude E and the reference amplitude value Ea when the vibrator 34a is vibrated in the air on the same condition and the viscosity is calculated by a specified equation. Thus, the seal member does not disturb the vibration thereby enabling the measurement of the viscosity of a high pressure fluid at a high accuracy.
IIDA TAKAMICHI
KAWAGUCHI KIYOHIKO
SAKAMOTO YOSHIYASU
