Is Elastohydrodynamic Minimum Film Thickness Truly Governed by Inlet Rheology?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F23%3APU150534" target="_blank" >RIV/00216305:26210/23:PU150534 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s11249-023-01771-y" target="_blank" >https://link.springer.com/article/10.1007/s11249-023-01771-y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11249-023-01771-y" target="_blank" >10.1007/s11249-023-01771-y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Is Elastohydrodynamic Minimum Film Thickness Truly Governed by Inlet Rheology?

Popis výsledku v původním jazyce

This work investigates the governing mechanisms of minimum film thickness in elastohydrodynamic lubricated contacts. Up until now, it was thought to be governed by lubricant rheology in the low-pressure contact inlet. Through numerical simulations of EHL line and circular contacts, lubricated with fluids having the same low-pressure viscosity, but a very different response at high-pressure, minimum film thickness is shown to be governed by lubricant inlet rheology only in the theoretical line contact configuration. In real contacts however, it is not only governed by inlet rheology, but also by the high-pressure viscosity response of the lubricant. It is observed that the greater the viscosity at high pressure, the lower the minimum film thickness would be, as a result of reduced lateral flow out of the contact. Conservation of mass requires then that a higher minimum film thickness would be attained along the central line of the contact, in the entrainment direction. These findings corroborate well with experimental observations.

Název v anglickém jazyce

Is Elastohydrodynamic Minimum Film Thickness Truly Governed by Inlet Rheology?

Popis výsledku anglicky

This work investigates the governing mechanisms of minimum film thickness in elastohydrodynamic lubricated contacts. Up until now, it was thought to be governed by lubricant rheology in the low-pressure contact inlet. Through numerical simulations of EHL line and circular contacts, lubricated with fluids having the same low-pressure viscosity, but a very different response at high-pressure, minimum film thickness is shown to be governed by lubricant inlet rheology only in the theoretical line contact configuration. In real contacts however, it is not only governed by inlet rheology, but also by the high-pressure viscosity response of the lubricant. It is observed that the greater the viscosity at high pressure, the lower the minimum film thickness would be, as a result of reduced lateral flow out of the contact. Conservation of mass requires then that a higher minimum film thickness would be attained along the central line of the contact, in the entrainment direction. These findings corroborate well with experimental observations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/GA21-28352S" target="_blank" >GA21-28352S: Reologické vlastnosti tenkých mazacích filmů v bodových kontaktech při přechodu do smíšeného mazání</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Tribology Letters

ISSN

1023-8883

e-ISSN

1573-2711

Svazek periodika

71

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

„“-„“

Kód UT WoS článku

001033902500001

EID výsledku v databázi Scopus

2-s2.0-85165620715