What is Brookfield viscometer used for?
The Brookfield Dial Reading Viscometer measures fluid viscosity at given shear rates. Viscosity is a measure of a fluid’s resistance to flow.
How is Brookfield viscosity measured?
Brookfield viscometers employ the well-known principle of rotational viscometry; they measure viscosity by sensing the torque required to rotate a spindle at constant speed while immersed in the sample fluid. The torque is proportional to the viscous drag on the immersed spindle, and thus to the viscosity of the fluid.
What does a viscometer measure?
viscometer, instrument for measuring the viscosity (resistance to internal flow) of a fluid. In one version, the time taken for a given volume of fluid to flow through an opening is recorded.
How long does a viscosity test take?
Up to 30 minutes may be necessary and possibly longer with some materials. Two flow time measurements should be obtained for each sample.
How do you test viscosity?
Viscosity can also be measured by applying oscillating vibrations to the sample and monitoring the damping effects of the fluid. These can be assessed by monitoring power input, the decay time of oscillations, or changes in the resonated frequency.
What is RPM in viscometer?
When we perform rheological experiments with a viscometer, usually it gives us shear stress values corresponding to particular revolution per minute (rpm). Then we convert rpm into a shear rate by multiplying a factor 1.7. After that we have a set of values shear stress and shear rate.
What is normal blood viscosity level?
Blood is a non-Newtonian, shear thinning fluid with thixotropic and viscoelastic properties. Many cardiovascular handbooks consider blood viscosity values between 3.5 and 5.5 cP to be normal.
How do I choose a spindle for my Brookfield viscometer?
If the reading is below 10% at the highest speed, the next largest spindle should be used. To test a fluid at multiple speeds, choose a spindle that will produce readings between 10% and 100% for at least three speed settings.