A smart friction control strategy enabled by CO2 absorption and desorption

Document identifier: oai:DiVA.org:ltu-76046
Access full text here:10.1038/s41598-019-49864-w
Keyword: Engineering and Technology, Chemical Engineering, Chemical Process Engineering, Teknik och teknologier, Kemiteknik, Kemiska processer, Mechanical Engineering, Tribology (Interacting Surfaces including Friction, Lubrication and Wear), Maskinteknik, Tribologi (ytteknik omfattande friktion, nötning och smörjning), Chemical Technology, Kemisk teknologi, Maskinelement, Machine Elements
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 3 Good health and wellbeing
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Intelligent control of friction is an attractive but challenging topic and it has rarely been investigated for full size engineering applications. In this work, it is instigated if it would be possible to adjust friction by controlling viscosity in a lubricated contact. By exploiting the ability to adjust the viscosity of the switchable ionic liquids, 1,8-Diazabicyclo (5.4.0) undec-7-ene (DBU)/ glycerol mixture via the addition of CO2, the friction could be controlled in the elastohydrodynamic lubrication (EHL) regime. The friction decreased with increasing the amount of CO2 to the lubricant and increased after partial releasing CO2. As CO2 was absorbed by the liquid, the viscosity of the liquid increased which resulted in that the film thickness increased. At the same time the pressure-viscosity coefficient decreased with the addition of CO2. When CO2 was released again the friction increased and it was thus possible to control friction by adding or removing CO2.

Authors

Jing Hua

Luleå tekniska universitet; Maskinelement
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Marcus Björling

Luleå tekniska universitet; Maskinelement
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Mattias Grahn

Luleå tekniska universitet; Kemiteknik
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Roland Larsson

Luleå tekniska universitet; Maskinelement
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Yijun Shi

Luleå tekniska universitet; Maskinelement
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