Brookfield DV3T Rheometer Manuel d'utilisateur télécharger pdf (Page 102)

Brookeld Engineering Labs., Inc. Page 102 Manual No. M13-2100

Rheometer Related Variables

Mostuidviscositiesarefoundtobenon-Newtonian.TheyaredependentonShearRate,timeoftestand

thespindlegeometryconditions.ThespecicationsoftheRheometerspindleandchambergeometry

willaffecttheviscosityreadings.Ifonereadingistakenat2.5RPM,andasecondat50RPM,the

twocPvaluesproducedwillbedifferentbecausethereadingsweremadeatdifferentshearrates.The

fasterthespindlespeed,thehighertheshearrate.

Theshearrateofagivenmeasurementisdeterminedby:therotationalspeedofthespindle,thesize

andshapeofthespindle,thesizeandshapeofthecontainerusedandthereforethedistancebetween

thecontainerwallandthespindlesurface.

Arepeatableviscositytestshouldcontrolorspecifythefollowing:

 1) Testtemperature

 2) Samplecontainersize(orspindle/chambergeometry)

 3) Samplevolume

 4) Rheometermodel

 5) Spindleused

 6) Whetherornottoattachtheguardleg

 7) Testspeedorspeeds(ortheshearrate)

 8) Lengthoftimeornumberofspindlerevolutionstorecordviscosity

 9) Howthesamplewaspreparedand/orloadedintothecontainer

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Brookfield DV3T Rheometer Manuel d'utilisateur Page 102