X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation

In an effort to further extend bearing life, the authors have attempted to acquire greater knowledge regarding lubricating grease behavior in a bearing. While conducting experiments, some kinds of difficulties commonly arise when attempting to observe grease behavior directly from the bearing exteri...

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Autores principales:	Takashi Noda, Kenichi Shibasaki, Shinji Miyata, Masato Taniguchi
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2020
Materias:	ball bearing grease x-ray ct non-newtonian fluid bingham plastic computational fluid dynamics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/92eb30fc57544a5f81adec2c86e5dbf7
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spelling	oai:doaj.org-article:92eb30fc57544a5f81adec2c86e5dbf72021-11-05T09:12:03ZX-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation1881-219810.2474/trol.15.36https://doaj.org/article/92eb30fc57544a5f81adec2c86e5dbf72020-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/15/1/15_36/_pdf/-char/enhttps://doaj.org/toc/1881-2198In an effort to further extend bearing life, the authors have attempted to acquire greater knowledge regarding lubricating grease behavior in a bearing. While conducting experiments, some kinds of difficulties commonly arise when attempting to observe grease behavior directly from the bearing exterior without removing seals and shields. Making a breakthrough such a troubling aspect, X-ray computed tomography (CT), which is one of the non-destructive inspection techniques, was employed and resulted in visualizing remarkable details of grease distribution in a resin ball bearing. Hydrodynamic grease transition from churning to channeling state was well revealed by the mixture distribution of urea and barium-based greases which have different properties of X-ray absorption capability. Furthermore, the three dimensional unsteady liquid-gas multi-phase flows analysis was performed. Hydrodynamic feature of grease was regarded as a non-Newtonian fluid, which shows a highly non-linear flow curve, and the constitutive equation of modified Bingham plastic model proposed by Papanastasiou was applied to rheological property. Through these novel experimental and calculation approaches, several new insights about grease behavior inside a ball bearing were brought out.Takashi NodaKenichi ShibasakiShinji MiyataMasato TaniguchiJapanese Society of Tribologistsarticleball bearinggreasex-ray ctnon-newtonian fluidbingham plasticcomputational fluid dynamicsPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 15, Iss 1, Pp 36-44 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	ball bearing grease x-ray ct non-newtonian fluid bingham plastic computational fluid dynamics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	ball bearing grease x-ray ct non-newtonian fluid bingham plastic computational fluid dynamics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Takashi Noda Kenichi Shibasaki Shinji Miyata Masato Taniguchi X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation
description	In an effort to further extend bearing life, the authors have attempted to acquire greater knowledge regarding lubricating grease behavior in a bearing. While conducting experiments, some kinds of difficulties commonly arise when attempting to observe grease behavior directly from the bearing exterior without removing seals and shields. Making a breakthrough such a troubling aspect, X-ray computed tomography (CT), which is one of the non-destructive inspection techniques, was employed and resulted in visualizing remarkable details of grease distribution in a resin ball bearing. Hydrodynamic grease transition from churning to channeling state was well revealed by the mixture distribution of urea and barium-based greases which have different properties of X-ray absorption capability. Furthermore, the three dimensional unsteady liquid-gas multi-phase flows analysis was performed. Hydrodynamic feature of grease was regarded as a non-Newtonian fluid, which shows a highly non-linear flow curve, and the constitutive equation of modified Bingham plastic model proposed by Papanastasiou was applied to rheological property. Through these novel experimental and calculation approaches, several new insights about grease behavior inside a ball bearing were brought out.
format	article
author	Takashi Noda Kenichi Shibasaki Shinji Miyata Masato Taniguchi
author_facet	Takashi Noda Kenichi Shibasaki Shinji Miyata Masato Taniguchi
author_sort	Takashi Noda
title	X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation
title_short	X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation
title_full	X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation
title_fullStr	X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation
title_full_unstemmed	X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation
title_sort	x-ray ct imaging of grease behavior in ball bearing and numerical validation of multi-phase flows simulation
publisher	Japanese Society of Tribologists
publishDate	2020
url	https://doaj.org/article/92eb30fc57544a5f81adec2c86e5dbf7
work_keys_str_mv	AT takashinoda xrayctimagingofgreasebehaviorinballbearingandnumericalvalidationofmultiphaseflowssimulation AT kenichishibasaki xrayctimagingofgreasebehaviorinballbearingandnumericalvalidationofmultiphaseflowssimulation AT shinjimiyata xrayctimagingofgreasebehaviorinballbearingandnumericalvalidationofmultiphaseflowssimulation AT masatotaniguchi xrayctimagingofgreasebehaviorinballbearingandnumericalvalidationofmultiphaseflowssimulation
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X-Ray CT Imaging of Grease Behavior in Ball Bearing and Numerical Validation of Multi-Phase Flows Simulation

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