shear rate

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shear rate

the change in velocity of parallel planes in a flowing fluid separated by unit distance; its units expressed in seconds-1.
References in periodicals archive ?
This is called shear thinning, and the rate of deformation of the paint as it is sheared is called the shear rate (units are reciprocal seconds, [s.sup.-1]).
However, such curves provide mainly relative moldability comparisons; the u n its of measurement (Pascal-seconds for viscosity and reciprocal seconds for shear rate) are of no practical value in judging a resin's process window.
Riley, consultant at Extrusion Engineers in Branchburg, New Jersey, will compare tests of lubricants and plastics at impossible shear rates exceeding 1 million reciprocal seconds ([s.sup.-1]).

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