Brookfield DV1 Viscometer Instrukcja Użytkownika Pobierz pdf (Strona 41)

Brookeld Engineering Laboratories, Inc. Page 41 Manual No. M14-023

Viscometer Related Variables

Most uid viscosities are found to be non-Newtonian. ey are dependent on Shear Rate and the spindle

geometry conditions. e specications of the viscometer spindle and chamber geometry will aect the

viscosity readings. If one reading is taken at 2.5 rpm, and a second at 50 rpm, the two viscosity values

produced will be dierent because the readings were made at dierent shear rates. e faster the spindle

speed, the higher the shear rate.

e 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) Viscometer model

5) Spindle used numbered

6) Test speed or speeds (or the shear rate)

7) Length of time or number of spindle revolutions to record viscosity

8) Presence/absence of guard leg (LV or RV models)

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Brookfield DV1 Viscometer Instrukcja Użytkownika Strona 41