Measure of the rate at which a solder cream is disturbed, e.g. by stirring or other flow processes.

For MR devices in valve mode, shear rate is not constant across the gap. Peak shear rate is approximately equal to the average flow velocity divided by one fourth of the gap width. For MR devices in direct-shear mode, shear rate is the ratio of the shear velocity divided by the gap width.

rate at which adjacent layers of fluid move with respect to each other, usually expressed as reciprocal seconds.

the velocity gradient in a flowing material; the shape and rotational speed of the spindle rotating in a chamber or cup are used to calculate shear rate.

Shear rate is a way to describe how quickly the velocity of the melt changes from the mould surface to the center of flow for a given cross section. The size of the shear rate gives an indication of the shape of the velocity profile for a given situation.

A measure of the rate feedstock is deformed and forced to flow into a die cavity. It has units of inverse seconds. Actually it is the shear strain rate, representing the sheared change in length divided by the original length in unit time. For PIM shear rates of several thousand per second are normal, meaning the slug of feedstock is quickly deformed to fill out the cavity.

The overall velocity over the cross section of a channel with which molten polymer layers are gliding along each other or along the wall in laminar flow.

Shear rate is a measure of the rate of shear deformation.