Influence of Free Water Droplets on Film Formation Under Point Contact Grease Lubrication

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F23%3APU150538" target="_blank" >RIV/00216305:26210/23:PU150538 - isvavai.cz</a>

Výsledek na webu

<a href="https://asmedigitalcollection.asme.org/tribology/article/145/7/074101/1159647" target="_blank" >https://asmedigitalcollection.asme.org/tribology/article/145/7/074101/1159647</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1115/1.4056944" target="_blank" >10.1115/1.4056944</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Free Water Droplets on Film Formation Under Point Contact Grease Lubrication

Popis výsledku v původním jazyce

The influence of the grease-water two-phase emulsion on the bearing tracks on the film formation has been studied by carrying out optical interferometry experiments on a ball disk test rig to observe the dynamic film-forming behavior of lubricating grease under steady-state and micro-oscillation conditions. It is found that free water causes a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil reservoirs on both sides. The experiment determines that the state of the phase before entering the elastohydrodynamic lubrication (EHL) contact is water-in-oil. For the reciprocating motion and oscillation, the effects of the amount of free water and the length of the motion stroke are discussed in detail. It is found that for reciprocating movements with long stroke lengths, the effect of free water is summarized to enhance the fluidity of the fibrous mass of the grease thickener in the first few cycles of the movement. For shorter stroke lengths, the effect of free water is a scouring effect on the contact zone grease after 100 cycles. This paper provides new insights into the effects that cause water pollution to the point of contact lubrication during the transformation from reciprocating motion to fretting.

Název v anglickém jazyce

Influence of Free Water Droplets on Film Formation Under Point Contact Grease Lubrication

Popis výsledku anglicky

The influence of the grease-water two-phase emulsion on the bearing tracks on the film formation has been studied by carrying out optical interferometry experiments on a ball disk test rig to observe the dynamic film-forming behavior of lubricating grease under steady-state and micro-oscillation conditions. It is found that free water causes a brief rise in the grease film under steady-state conditions, specifically due to the grease-water phase connecting the oil reservoirs on both sides. The experiment determines that the state of the phase before entering the elastohydrodynamic lubrication (EHL) contact is water-in-oil. For the reciprocating motion and oscillation, the effects of the amount of free water and the length of the motion stroke are discussed in detail. It is found that for reciprocating movements with long stroke lengths, the effect of free water is summarized to enhance the fluidity of the fibrous mass of the grease thickener in the first few cycles of the movement. For shorter stroke lengths, the effect of free water is a scouring effect on the contact zone grease after 100 cycles. This paper provides new insights into the effects that cause water pollution to the point of contact lubrication during the transformation from reciprocating motion to fretting.

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

ASME Transaction, Journal of Tribology

ISSN

0742-4787

e-ISSN

1528-8897

Svazek periodika

145

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

17

Strana od-do

„074101-1“-„074101-17“

Kód UT WoS článku

000994572600004

EID výsledku v databázi Scopus

2-s2.0-85177989154