Acoustic Viscosity Characteristics of Oils with High Molecular Weight VI Improver Additives
- Acoustic Viscosity Characteristics of Oils with High Molecular Weight VI Improver Additives
- 공호성; 오씨아; 한흥구
- kinematic viscosity; absolute viscosity; acoustic viscosity; viscometer; VI additive; 동점도; 절대점도; 음향점도; 점도계; 점도지수향상제
- Issue Date
- 한국윤활학회지; Journal of the KSTLE (Journal of the Korean Society of Tribologists and Lubrication Engineers)
- VOL 25, NO 4, 236-242
- Oil viscosity is one of the important parameters for machinery condition monitoring. Basically, it is
expressed as kinematic viscosity measured by capillary flow and dynamic or absolute viscosity measured by
rotary shear viscometry. Recently, acoustic wave techniques appear in the market, measuring viscosity as the
product of dynamic viscosity and density. For Newtonian fluids, knowledge of density allows conversion from
one viscosity parameter to the other at a specific shear rate and temperature. In this work, oil samples with different
chain lengths of viscosity index (VI) improvers and concentrations were examined by different viscometric
techniques. Results showed that acoustic viscosity measurements give misleading results for oil samples with
high molecular weight VI improvers and at low temperatures ≤ 40℃.
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