On the Flow Dynamics of Polymer Greases

被引：9

作者：

Farre-Llados, Josep ^{[1
]}

Westerberg, Lars G. ^{[2
]}

Casals-Terre, Jasmina ^{[1
]}

Leckner, Johan ^{[3
]}

Westbroek, Rene ^{[3
]}

机构：

[1] UPC Tech Univ Catalonia, Mech Engn Dept, Terrassa 08222, Spain

[2] Lulea Univ Technol, Div Fluid & Expt Mech, SE-97187 Lulea, Sweden

[3] Axel Christiernsson Int AB SE, SE-44911 Nol, Sweden

来源：

LUBRICANTS | 2022年 / 10卷 / 04期

关键词：

lubricating grease; polymer thickener; lithium grease; flow dynamics; rheology; micro-particle image velocimetry; oil bleeding; transitional flow; POLYPROPYLENE; LUBRICATION; BEHAVIOR;

D O I：

10.3390/lubricants10040066

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In this paper, the flow dynamics of polymer greases was investigated using micro-particle image velocimetry. Polymer greases have a different thickener structure, compared to widely used lithium-based greases, and they have the well-known ability to release oil. How these properties affect grease deformation and its ability to flow is investigated and compared to the corresponding behavior of a lithium complex grease with the same consistency. Two main tests were carried out, where velocity profiles in a straight channel were measured and analyzed, and velocity evolution during the transition period from a no-flow to a fully-established flow was measured, respectively. It was found that the polymer grease flow dynamics is different from that of the lithium grease. This indicates that the internal structure of the grease and the grease ability to bleed oil have a strong influence on the deformation on a global scale, which in turn entails other lubricating abilities for the two grease types.

引用

页数：10

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