Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface

Modified Reynolds-Darcy equation for ferrofluid lubricated squeeze-film bearing, made by flat circular porous upper and flat circular impermeable lower discs, is derived. The ferrofluid is controlled by oblique variable magnetic field (VMF) and VMF is important because of its advantage of generating...

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Autores principales:	Rajesh C. Shah, Ramesh C. Kataria, Darshana A. Patel
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2019
Materias:	porous squeeze-film lubrication ferrofluid reynolds-darcy equation pressure difference 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/fe820b1f16d644fe803444dded3834ee
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spelling	oai:doaj.org-article:fe820b1f16d644fe803444dded3834ee2021-11-05T09:17:49ZFerrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface1881-219810.2474/trol.14.123https://doaj.org/article/fe820b1f16d644fe803444dded3834ee2019-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/14/3/14_123/_pdf/-char/enhttps://doaj.org/toc/1881-2198Modified Reynolds-Darcy equation for ferrofluid lubricated squeeze-film bearing, made by flat circular porous upper and flat circular impermeable lower discs, is derived. The ferrofluid is controlled by oblique variable magnetic field (VMF) and VMF is important because of its advantage of generating maximum field at the required active contact zone. The porous matrix is considered because of its advantageous property of self-lubrication. Moreover, the validity of the Darcy’s law is assumed in the porous matrix. Expression for dimensionless film pressure p in terms of Bessel function by considering the effect of existence of pressure difference at the film-porous interface is obtained. The expression for dimensionless load-carrying capacity W is also obtained. The effects of dimensionless radial parameter, inverse of the dimensionless film thickness parameter (h0 / h) , magnetization parameter and squeeze velocity are studied on p, whereas the effects of the inverse of the dimensionless film thickness parameter and magnetization parameter and squeeze velocity are studied on W. Moreover, the effect of dimensionless pressure difference P at the film-porous interface is studied on Wn (which is the term because of existence of the pressure difference at the film-porous interface). The results show that p increases for smaller values of radial parameter, larger values of magnetization parameter and when (h0 / h) ≤ 12, whereas W increases for larger values of magnetization parameter and when (h0 / h) ≤ 12. The squeeze velocity have no effects on the variation of p and W. Moreover, the results for Wn show that it increases with the increase of P.Rajesh C. ShahRamesh C. KatariaDarshana A. PatelJapanese Society of Tribologistsarticleporous squeeze-filmlubricationferrofluidreynolds-darcy equationpressure differencePhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 14, Iss 3, Pp 123-130 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	porous squeeze-film lubrication ferrofluid reynolds-darcy equation pressure difference Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	porous squeeze-film lubrication ferrofluid reynolds-darcy equation pressure difference Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Rajesh C. Shah Ramesh C. Kataria Darshana A. Patel Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface
description	Modified Reynolds-Darcy equation for ferrofluid lubricated squeeze-film bearing, made by flat circular porous upper and flat circular impermeable lower discs, is derived. The ferrofluid is controlled by oblique variable magnetic field (VMF) and VMF is important because of its advantage of generating maximum field at the required active contact zone. The porous matrix is considered because of its advantageous property of self-lubrication. Moreover, the validity of the Darcy’s law is assumed in the porous matrix. Expression for dimensionless film pressure p in terms of Bessel function by considering the effect of existence of pressure difference at the film-porous interface is obtained. The expression for dimensionless load-carrying capacity W is also obtained. The effects of dimensionless radial parameter, inverse of the dimensionless film thickness parameter (h0 / h) , magnetization parameter and squeeze velocity are studied on p, whereas the effects of the inverse of the dimensionless film thickness parameter and magnetization parameter and squeeze velocity are studied on W. Moreover, the effect of dimensionless pressure difference P at the film-porous interface is studied on Wn (which is the term because of existence of the pressure difference at the film-porous interface). The results show that p increases for smaller values of radial parameter, larger values of magnetization parameter and when (h0 / h) ≤ 12, whereas W increases for larger values of magnetization parameter and when (h0 / h) ≤ 12. The squeeze velocity have no effects on the variation of p and W. Moreover, the results for Wn show that it increases with the increase of P.
format	article
author	Rajesh C. Shah Ramesh C. Kataria Darshana A. Patel
author_facet	Rajesh C. Shah Ramesh C. Kataria Darshana A. Patel
author_sort	Rajesh C. Shah
title	Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface
title_short	Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface
title_full	Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface
title_fullStr	Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface
title_full_unstemmed	Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface
title_sort	ferrofluid lubricated porous squeeze-film bearing with the modified condition of pressure continuity at the film-porous interface
publisher	Japanese Society of Tribologists
publishDate	2019
url	https://doaj.org/article/fe820b1f16d644fe803444dded3834ee
work_keys_str_mv	AT rajeshcshah ferrofluidlubricatedporoussqueezefilmbearingwiththemodifiedconditionofpressurecontinuityatthefilmporousinterface AT rameshckataria ferrofluidlubricatedporoussqueezefilmbearingwiththemodifiedconditionofpressurecontinuityatthefilmporousinterface AT darshanaapatel ferrofluidlubricatedporoussqueezefilmbearingwiththemodifiedconditionofpressurecontinuityatthefilmporousinterface
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Ferrofluid Lubricated Porous Squeeze-Film Bearing with the Modified Condition of Pressure Continuity at the Film-Porous Interface

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