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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On the basis of product, the rheometers and viscometers market is segmented into rheometers (further segmented into dynamic rotational rheometers, torque rotational rheometers, capillary rheometers, oscillatory rheometers, high-throughput rheometers and other rheometers) and viscometers (further segmented into rotational viscometers, process viscometers, capillary viscometers and other viscometers).
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In this paper, we report and discuss the experimental results of a similar rheokinetic study performed with a helical barrel rheometer.
After recently upgrading to the Paar Physica USD 200 Rheometer, researchers at the Dow laboratories in North America, Asia, and Europe can study the interaction of coating and paper by measuring rheology of the coating directly on the base paper.