6533b855fe1ef96bd12b0af0
RESEARCH PRODUCT
Low-cost viscometer based on energy dissipation in viscous liquids
A NicolasG. CristobalH UshikiPascal PanizzaJ. RouchC Hashimotosubject
[PHYS]Physics [physics]Materials science[ PHYS ] Physics [physics]Applied MathematicsThermodynamicsViscometer02 engineering and technologyViscous liquidApparent viscosity021001 nanoscience & nanotechnology01 natural sciences[PHYS] Physics [physics]Condensed Matter::Soft Condensed MatterPhysics::Fluid DynamicsShear rateViscosityRheology0103 physical sciencesNewtonian fluid010306 general physics0210 nano-technologyShear flowInstrumentationEngineering (miscellaneous)ComputingMilieux_MISCELLANEOUSdescription
We describe a new type of low-cost easy-to-use viscometer based on the temperature elevation in a liquid under shear flow. After calibration, this instrument can be used to measure the apparent steady state viscosity for both Newtonian and non-Newtonian liquids with no yield stress. We compute the rise in temperature due to viscous dissipation in a Couette cell and compare it to experimental results for different fluids. We show that the variation of the temperature with shear rate can be used to characterize the rheological behaviour of viscous fluids and to evaluate their viscosity in a large domain, from typically a few cP up to more than 10 P, with an accuracy of about ±5%. In contrast to simple viscometers, non-Newtonian fluids can be studied with this apparatus. We give experimental results for Newtonian and non-Newtonian liquids and show that they are very similar to those given in the literature by using much more sophisticated instruments.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-03-19 |