Acoustic Viscosity Characteristics of Oils with High Molecular Weight VI Improver Additives

Title
Acoustic Viscosity Characteristics of Oils with High Molecular Weight VI Improver Additives
Authors
공호성오씨아한흥구
Keywords
kinematic viscosity; absolute viscosity; acoustic viscosity; viscometer; VI additive; 동점도; 절대점도; 음향점도; 점도계; 점도지수향상제
Issue Date
2009-08
Publisher
한국윤활학회지; Journal of the KSTLE (Journal of the Korean Society of Tribologists and Lubrication Engineers)
Citation
VOL 25, NO 4, 236-242
Abstract
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℃.
URI
http://pubs.kist.re.kr/handle/201004/35848
ISSN
1229-4845
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE