R-205.10.284 [2016-03] Viscosity of Wort – Capillary Viscometer

The wort analysis methods are written, for example, for wort that is produced using the Congress mash method. These methods may also be applied in the analysis of wort which has been produced using a different mash method, particularly the isothermal 65 °C method. However, the reference values listed in the analysis method for Congress wort are not transferable.

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Application/Purpose

Capillary viscometers measure the kinematic viscosity of Newtonian fluids, unlike falling ball and rotational viscometers, which directly measure the dynamic viscosity. However, the dynamic viscosity can be calculated with values for the kinematic viscosity and the density of the test liquid.

Scope of Application

Suitable for any wort or mash

Principle

The time required for a volumetrically defined amount of fluid (the volume between two marks on the tube of the viscometer) to flow through a capillary of a defined length is measured.

Definition:

1 square meter per second is the kinematic viscosity of a homogenous fluid with a dynamic viscosity of 1 Pa × s and a density 1 kg/m3.

The unit for expressing kinematic viscosity (the relationship of viscosity to density = viscoplasticity) is 1 m2/s = 106 mm2/s

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