Abstract
It is important to predict the gaseous phase area of journal bearing. However, a detailed calculation method for such gaseous phase areas has not yet been proposed. In this study, the gaseous-phase areas in small bore journal bearings under flooded and starved lubrication conditions are analyzed in terms of the computational fluid dynamics (CFD) of two-phase flow while using a volume of fluid (VOF) method. Furthermore, the influence of surface tension and vapor pressure conditions were investigated, and the analytical and experimental results were compared. The analytical results of VOF for vapor pressure and surface tension were observed to be consistent with the experimental observations under both flooded and starved lubrication conditions. Furthermore, under starved lubrication condition, the analytical results agree well with the observed results for the interface of the oil film and cavitation upon the rupture of the oil film. While using these results, CFD analysis of the two-phase flow of the VOF can be conducted in terms of vapor pressure and surface tension to estimate the gaseous-phase areas of journal bearings under flooded and starved lubrication conditions.
Highlights
Many researchers have studied the cavitation area prediction of hydrodynamic journal bearing, because the characteristics of the bearings are strongly affected by the gaseous-phase areas
The test bearing is manufactured while using transparent acryl, which allows for us to observe the formation of the oil film and the generation of the gas
clearance of the bearing (Cr) while using transparent acryl, which allows for us to observe the formation of the oil film and the film and the generation of the gas
Summary
Many researchers have studied the cavitation area prediction of hydrodynamic journal bearing, because the characteristics of the bearings are strongly affected by the gaseous-phase areas. Zhai et al and Dhande et al have analyzed the cavitation area of a journal bearing using the VOF method by considering the vapor pressure. Egbers et al analyzed the journal bearings while using the analytical method that depicted a combination of the Reynolds equation and CFD analysis by considering the two-phase flows [18]. The analytical results cannot precisely produce the cavitation scale and shape, because the influence of the surface tension has not been calculated In this situation, the current study visualized the gaseous-phase area on both the bearing surface and the oil-filler port in a small-bore journal bearing under the flooded and starved lubrication conditions. Authors considered the influence of surface tension on journal bearing from the Weber number, We
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