Definition : Measuring instruments designed to determine the friction of the molecular components of a fluid as they slide with each other when flowing (i.e., viscosity). These devices may be intended to measure viscosity in liquids whose viscosity is constant with temperature or shear rate (i.e., Newtonian fluids such as water), in liquids whose viscosity changes with temperature or shear stress (i.e., non-Newtonian fluids), or both. Manual and automated viscosimeters using a variety of techniques are available, including falling ball, capillary, and rising bubble techniques.
Entry Terms : "Viscometers"
UMDC code : 23734