Temperature distribution and heat generating/transfer mechanism of the circular bilayer porous bearing for thermo-hydrodynamic problem

Zhang, Guotao; Tong, Baohong; Ye, Yin

doi:10.1016/j.ijheatmasstransfer.2019.119134

Cited by 11 publications

(7 citation statements)

References 26 publications

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“…Most of the existing research believe that the oil bearing can form a complete hydrodynamic lubrication film under certain conditions. And this assumption is verified by many experiments (Cui et al, 2018;Zhang et al, 2020b). Under the harsh working conditions, part of the microconvex on the roughness surface contacts directly.…”

Section: Introductionmentioning

confidence: 68%

Analysis of seepage and lubrication characteristics of bilayer porous bearing under mixed lubrication

Zhang

Cai²,

Xu³

et al. 2022

ILT

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Purpose The purpose of this paper is to put forward the lubrication model of oil bearing and enrich the design theory under the condition of mixed lubrication. Design/methodology/approach A mixed lubrication model of bilayer porous bearing is established. The effects of the working conditions on the lubrication performance and seepage behavior were analyzed. Findings Results show that the oil film pressure mainly occurs in the bearing convergence zone and contact pressure mainly occurs near the minimum film thickness. The oil infiltrates into the porous matrix in the contact area and precipitates out to the friction surface at the inlet of the contact area. The oil seepage velocity and dynamic pressure effect at the friction interface can be improved by reasonably matching the load and speed. With the decrease of the external load or increase of the rotating speed, the lubrication performance becomes well. Originality/value This study provides a reference for the design and application of oil bearing under harsh working conditions.

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Section: Introductionmentioning

confidence: 68%

Analysis of seepage and lubrication characteristics of bilayer porous bearing under mixed lubrication

Zhang

Cai²,

Xu³

et al. 2022

ILT

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“…The previous study has shown that the isotropy assumption based on the statistical theory is an effective treatment method. [ 19 ] Therefore, it can also be assumed that the pore distribution is isotropic in the material. When the deformation of the material is not considered, the flow in the porous matrix is determined by the following formulae.

V = - \frac{k}{} \nabla p

$$\frac{\partial \left(\right.

…”

Section: Numerical Modelmentioning

confidence: 99%

“…While in the negative pressure zone, the lubricant extrudes from the porous matrix to the friction interface. The previous studies on the self‐lubricating system [ 19–21 ] also show that there are many complex microflow patterns on the friction interface simultaneously, for example, rotating flow, telescopic flow, and dialysis flow. The lubricant mainly infiltrates into the porous matrix at the contact region and then circulates between the friction interface and the porous matrix.…”

Section: Introductionmentioning

confidence: 99%

Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

et al. 2023

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This article aims to investigate the percolation and supply behavior of lubricant on the porous self-lubricating material. The numerical model is established to describe the infiltration-exudation response in the deformed porous material. It is found that the lubricant stored in the pores is forced to flow when the loaded porous matrix deforms. The flow drives the seepage stratification in the porous body and forms an interlayer flow zone. The fluid pressure gradient in the normal direction is the internal factor of the seepage stratification. The interlayer flow zone first appears in the middle of the vertical direction of the porous matrix. With the increase of loading time, the interlayer flow zone gradually moves from the middle to the bottom of the porous matrix, which means that the quantity of the lubricant stored in the porous surface decreases. In the whole process of the seepage response, the lubricant flows out from the inlet and continuously supplies lubricant to the contact area. Delaying the downward movement of the interlayer flow zone can ensure the continuous exudation of the lubricant, which is beneficial to maintain excellent lubrication characteristics.

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“…By analysing the tribological characteristics of porous materials with different porosity distributions, Zhang 16,17 provided a physical model for the exudation of lubricant from pores to the surface under different loading conditions. Yang 18 prepared a porous polyimide material by 3D printing technology. He observed the phenomenon of lubricant exudation on the friction surface, and emphasised that the stable exudation of the lubricant ensured the ultra‐low friction properties of porous materials.…”

Section: Introductionmentioning

confidence: 99%

Transient squeezing flow of the lubricant impregnated in the porous material

Zhang

Jiang

et al. 2023

Lubrication Science

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Porous materials are widely used in friction pairs. The transient squeezing flow of the lubricant significantly affects the lubrication quality. The study found that the lubricant penetrates into the porous matrix in the contact area and exudes upward to the entrance of the contact area. The maximum stress occurs at the subsurface of the contact zone, and the maximum pressure occurs at the contact centre. In the early loading stage, the lubricant exudates, resulting in a higher liquid‐phase load. With the prolongation of the time, the average stress decreases and then increases gradually, whilst the average pressure has the opposite change. In the late loading stage, the load is completely borne by the solid phase. Increasing the load will increases the seepage velocity of the lubricant, which enhance the pumping effect of the friction interface. The findings can help for better understanding of the self‐lubrication mechanism of the porous materials.

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Temperature distribution and heat generating/transfer mechanism of the circular bilayer porous bearing for thermo-hydrodynamic problem

Cited by 11 publications

References 26 publications

Analysis of seepage and lubrication characteristics of bilayer porous bearing under mixed lubrication

Analysis of seepage and lubrication characteristics of bilayer porous bearing under mixed lubrication

Percolation and Supply Behavior of Lubricant on Porous Self‐Lubricating Material

Transient squeezing flow of the lubricant impregnated in the porous material

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