This work addresses the development and assessment of a fiber optical viscometer using a simple and low-cost long-period fiber grating (LPFG) level sensor and a capillary tube mechanism. Previous studies of optical viscosity sensors were conducted by using different optical sensing methods. The proposed optical viscometer consists of an LPFG sensor, a temperature-controlled chamber, and a cone-...

An in-line viscometer is valuable to the control of a flow process, particularly a non-Newtonian flow because its viscosity is shear-rate dependent and thus requires continuous monitoring. Currently available in-line viscometers are mostly of the probe design [1] and may obstruct the flow pattern, causing plugging problem in flows with suspended particles. A probe-type viscometer generally meas...

A robust and precise viscometer using the forces exerted by a laminar flow inside a small duct is presented: the force is measured on a long cylindrical sensor dipped into the flow. Two devices of respective volumes 1.4 and 0.031 ml have been realized, demonstrating that the technique is usable with small fluid volumes. Several Newtonian and non-Newtonian fluids have been tested at shear rates ...

Abstract A complete theoretical analysis of the fluid and solid dynamics torsional quartz crystal viscometer is presented which for first time, establishes a firm basis two working equations whereby viscosity may be determined from measurements resonant frequency width resonance when immersed in fluid. Modern instrumentation means that it possible to achieve higher resolution measurement these ...

Rubber profiles fabricated by means of extrusion are widely used in civil engineering, e.g., in pipeline constructions and for window sealings. The dimensioning of injection heads for the extrusion of rubber profiles is exclusively based on empiric knowledge of the non-linear flow behaviour of elastomers, basically of the so-called die swell. The swelling of the extrudate when emerging from a c...