Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact
This paper describes an experimental study of starvation and flow behavior in grease-lubricated elastohydrodynamic contact. Rolling tests were conducted with four grease samples with different thickeners and base oils in a conventional ball-on-disk test rig. The EHL central film thickness was determ...
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Japanese Society of Tribologists
2015
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oai:doaj.org-article:ab2b7404423d49e490af9bb1eb46f6932021-11-05T09:22:45ZExperimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact1881-219810.2474/trol.10.48https://doaj.org/article/ab2b7404423d49e490af9bb1eb46f6932015-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/10/1/10_48/_pdf/-char/enhttps://doaj.org/toc/1881-2198This paper describes an experimental study of starvation and flow behavior in grease-lubricated elastohydrodynamic contact. Rolling tests were conducted with four grease samples with different thickeners and base oils in a conventional ball-on-disk test rig. The EHL central film thickness was determined with SLIM, the Spacer Layer Imaging Method, and grease flow around the conjunction and the flow pattern on the track of the disk specimen were observed with CCD cameras. The grease track included some thickener deposited on the track and a corrugated fingerlike flow pattern outward from the center of the track. It was found that the flow pattern varied with grease type and test conditions, and that the average interval between fingers decreased with the entrainment speed. At higher speeds, inlet starvation occurred and the finger pattern was deformed and gradually ruptured. The speed of the finger-loss was higher than the speed at which starvation started. It was also found that the starvation speed was greater with greases having lower apparent viscosity at lower shear rate and higher apparent viscosity at high shear rate. This implied that the replenishment and entrainment of the greases depended on the viscosity characteristics of the greases.Jing ChenHiroyoshi TanakaJoichi SugimuraJapanese Society of Tribologistsarticlegreaseelastohydrodynamic lubricationstarvationviscosityfilm thicknessflow patternPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 10, Iss 1, Pp 48-55 (2015) |
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DOAJ |
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DOAJ |
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EN |
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grease elastohydrodynamic lubrication starvation viscosity film thickness flow pattern Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 |
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grease elastohydrodynamic lubrication starvation viscosity film thickness flow pattern Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Jing Chen Hiroyoshi Tanaka Joichi Sugimura Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact |
| description |
This paper describes an experimental study of starvation and flow behavior in grease-lubricated elastohydrodynamic contact. Rolling tests were conducted with four grease samples with different thickeners and base oils in a conventional ball-on-disk test rig. The EHL central film thickness was determined with SLIM, the Spacer Layer Imaging Method, and grease flow around the conjunction and the flow pattern on the track of the disk specimen were observed with CCD cameras. The grease track included some thickener deposited on the track and a corrugated fingerlike flow pattern outward from the center of the track. It was found that the flow pattern varied with grease type and test conditions, and that the average interval between fingers decreased with the entrainment speed. At higher speeds, inlet starvation occurred and the finger pattern was deformed and gradually ruptured. The speed of the finger-loss was higher than the speed at which starvation started. It was also found that the starvation speed was greater with greases having lower apparent viscosity at lower shear rate and higher apparent viscosity at high shear rate. This implied that the replenishment and entrainment of the greases depended on the viscosity characteristics of the greases. |
| format |
article |
| author |
Jing Chen Hiroyoshi Tanaka Joichi Sugimura |
| author_facet |
Jing Chen Hiroyoshi Tanaka Joichi Sugimura |
| author_sort |
Jing Chen |
| title |
Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact |
| title_short |
Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact |
| title_full |
Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact |
| title_fullStr |
Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact |
| title_full_unstemmed |
Experimental Study of Starvation and Flow Behavior in Grease-Lubricated EHD Contact |
| title_sort |
experimental study of starvation and flow behavior in grease-lubricated ehd contact |
| publisher |
Japanese Society of Tribologists |
| publishDate |
2015 |
| url |
https://doaj.org/article/ab2b7404423d49e490af9bb1eb46f693 |
| work_keys_str_mv |
AT jingchen experimentalstudyofstarvationandflowbehavioringreaselubricatedehdcontact AT hiroyoshitanaka experimentalstudyofstarvationandflowbehavioringreaselubricatedehdcontact AT joichisugimura experimentalstudyofstarvationandflowbehavioringreaselubricatedehdcontact |
| _version_ |
1718444429680836608 |