Brookfield DV-I Viscometer - Manual (Page 27)

Brookfield Engineering Laboratories, Inc. Page 27 Manual No. M/92-021-O604
all particle movement is in layers directed by the shearing force. For rotational systems, this
means all fluid movement must be circumferential. When the inertial forces on the fluid become
too great, the fluid can break into turbulent flow wherein the movement of fluid particles be-
comes random and the flow can not be analyzed with standard math models. This turbulence
creates a falsely high viscometer reading with the degree of non-linear increase in reading being
directly related to the degree of turbulence in the fluid.
For the following geometries, we have found that an approximate transition point to turbulent
flow occurs:
1) No. 1 LV Spindle: 15 cP at 60 RPM
2) No. 1 RV Spindle: 100 cP at 50 RPM (optional spindle available from Brookfield)
3) UL Adapter:
0.85 cP at 60 RPM
Turbulent conditions will exist in these situations whenever the RPM/cP ratio exceeds the values
listed above.