Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)

Using high-pressure viscosity measurements of 23 kinds of VII-blended oil reported in Part 1, a high-pressure viscosity prediction formula for VII-blended oil was derived. This equation is expressed in a so-called Barus formula, and the pressure-viscosity coefficient is the secant pressure-viscosity...

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Autores principales:	Hitoshi Hata, Yoshitaka Tamoto
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2021
Materias:	vii-blended oil high-pressure viscosity secant pressure-viscosity coefficient viscosity index relative viscosity increment 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/47d8042c85bb41c2ba69dffc4e8a8930
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spelling	oai:doaj.org-article:47d8042c85bb41c2ba69dffc4e8a89302021-11-05T09:30:56ZStudy on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)1881-219810.2474/trol.16.38https://doaj.org/article/47d8042c85bb41c2ba69dffc4e8a89302021-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/16/1/16_38/_pdf/-char/enhttps://doaj.org/toc/1881-2198Using high-pressure viscosity measurements of 23 kinds of VII-blended oil reported in Part 1, a high-pressure viscosity prediction formula for VII-blended oil was derived. This equation is expressed in a so-called Barus formula, and the pressure-viscosity coefficient is the secant pressure-viscosity coefficient αB(p)-Bl (= ln(ηpt / ηot) /P) in each ln(ηpt) ‒ P relation curve. The calculation formula of αB(p)-Bl is composed of the corresponding base oil value αB(p)-Bf, the polymer coil itself pressure-viscosity coefficient αPm and the polymer concentration wPm (wt%). In relation to mentioned above, the volume fraction of one polymer molecule in hydrodynamically equivalent sphere, and the volume fraction of the hydrodynamic volume occupied in 100 cm3 of VII-blended oil at critical concentration c* of polymer coil were investigated. It was also found that the viscosity index VIo-Bl in the atmospheric pressure of the VII-blended oil drops with pressure. For this reason, the effect of temperature on the ln(ηpt) ‒ P relation curve, the influence of polymer type and base oil in ηi ‒ P ‒ t relationship, and the influence of polymer type on atmospheric pressure viscosity ηot ‒ t relationship were discussed.Hitoshi HataYoshitaka TamotoJapanese Society of Tribologistsarticlevii-blended oilhigh-pressure viscositysecant pressure-viscosity coefficientviscosity indexrelative viscosity incrementPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 16, Iss 1, Pp 38-48 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	vii-blended oil high-pressure viscosity secant pressure-viscosity coefficient viscosity index relative viscosity increment Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	vii-blended oil high-pressure viscosity secant pressure-viscosity coefficient viscosity index relative viscosity increment Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Hitoshi Hata Yoshitaka Tamoto Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)
description	Using high-pressure viscosity measurements of 23 kinds of VII-blended oil reported in Part 1, a high-pressure viscosity prediction formula for VII-blended oil was derived. This equation is expressed in a so-called Barus formula, and the pressure-viscosity coefficient is the secant pressure-viscosity coefficient αB(p)-Bl (= ln(ηpt / ηot) /P) in each ln(ηpt) ‒ P relation curve. The calculation formula of αB(p)-Bl is composed of the corresponding base oil value αB(p)-Bf, the polymer coil itself pressure-viscosity coefficient αPm and the polymer concentration wPm (wt%). In relation to mentioned above, the volume fraction of one polymer molecule in hydrodynamically equivalent sphere, and the volume fraction of the hydrodynamic volume occupied in 100 cm3 of VII-blended oil at critical concentration c* of polymer coil were investigated. It was also found that the viscosity index VIo-Bl in the atmospheric pressure of the VII-blended oil drops with pressure. For this reason, the effect of temperature on the ln(ηpt) ‒ P relation curve, the influence of polymer type and base oil in ηi ‒ P ‒ t relationship, and the influence of polymer type on atmospheric pressure viscosity ηot ‒ t relationship were discussed.
format	article
author	Hitoshi Hata Yoshitaka Tamoto
author_facet	Hitoshi Hata Yoshitaka Tamoto
author_sort	Hitoshi Hata
title	Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)
title_short	Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)
title_full	Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)
title_fullStr	Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)
title_full_unstemmed	Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)
title_sort	study on relations of high-pressure viscosity properties and the polymer behavior of various viscosity index improver-blended oil (part 2)
publisher	Japanese Society of Tribologists
publishDate	2021
url	https://doaj.org/article/47d8042c85bb41c2ba69dffc4e8a8930
work_keys_str_mv	AT hitoshihata studyonrelationsofhighpressureviscositypropertiesandthepolymerbehaviorofvariousviscosityindeximproverblendedoilpart2 AT yoshitakatamoto studyonrelationsofhighpressureviscositypropertiesandthepolymerbehaviorofvariousviscosityindeximproverblendedoilpart2
_version_	1718444285633757184

Study on Relations of High-Pressure Viscosity Properties and the Polymer Behavior of Various Viscosity Index Improver-Blended Oil (Part 2)

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