Rheometer

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rheometer

[rē′äm·əd·ər]
(engineering)
An instrument for determining flow properties of solids by measuring relationships between stress, strain, and time.

Rheometer

 

an instrument for measuring the flow of a viscous fluid. In the USSR, the term is applied to a type of rate-of-flow meter that measures the volume flow of a gas. The operation of such a rheometer is based on the measurement of the pressure drop across a constriction in the pipe through which the gas flows; the constriction may be in the form of an orifice or capillary tube. The pressure drop is a single-valued function of the flow rate of the gas and is measured by a differential manometer, whose scale is generally marked in units of gas flow, such as cm3/min or liters per hour (l/hr). Such rheometers are used for measuring flow rates of up to 104l/hr in industrial and laboratory installations. For example, they are used in equipment for the chlorination of water and in devices for the quantitative analysis of the composition of gases.

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Then, rheometrical tests and bound rubber measurements were performed as described earlier.
For example, the blends with 1 wt% LDPE essentially shows the exact same shear behavior with the pure LLDPE in both capillary and parallel-plate rheometrical tests.
In order to ascertain material stability during rheometrical tests, systematic time sweep experiments were carried out.
The experimental curve exhibits data from two rheometrical measurements, namely steady state shear flow in a capillary rheometer and oscillatory shear flow using a dynamic stress rheometer.