Investigations of the three-dimensional temperature field of journal bearings considering conjugate heat transfer and cavitation

Li, Qiang; Zhang, Shuo; Wang, Yujun; Xu, Weiwei; Wang, Zhenbo

doi:10.1108/ilt-03-2018-0113

Cited by 16 publications

(17 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, the profile of temperature distribution is not as smooth and steady as those of film thickness and pressure, which is caused by the comprehensive effects of the temperature gradients in the radial and the axial directions and the variations of film thickness. Li et al [ 34 ] reported that the temperature distribution spreads in a strip, on the journal interface, whereas in a square, on the bearing interface, nevertheless, they did not mention the temperature distribution in the lubricant film itself, and the results in this research can be regarded as a supplement and an explanation for the temperature distributions on the surfaces.…”

Section: Resultsmentioning

confidence: 72%

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Jiang

Liang²,

Huang³

et al. 2021

Micromachines

View full text Add to dashboard Cite

This paper focuses on the flow and thermal characteristics of the lubricant film in the micro clearance of a hydrodynamic journal bearing (HJB) at high rotating speed. A thermohydrodynamic (THD) method consists of the Reynolds equation coupled with energy and viscosity-temperature equation with considering the cavitation is put forward. The 3D surface diagrams of the lubricant film thickness, pressure, temperature, liquid mass fraction, flow rate and heat dissipation distributions under different geometric, operating, slip and no-slip boundary conditions are systemically exhibited and analyzed. The results show that with the rise of eccentricity or length diameter ratio, the maximum peaks of pressure, temperature and heat dissipation are rapidly increased, the cavitation is aggravated, and the flow rate is accelerated in different extent. As the bearing speed accelerating, the maximum peak of temperature is strongly increased, whereas, the distinction between peaks of flow rate and heat dissipation is magnified and reduced, respectively. It provides a fruitful inside view of the inner flow and thermal characterizations of HJB for further understanding its flow-thermal interaction mechanisms and offers theoretical support for improving its working performance.

show abstract

Section: Resultsmentioning

confidence: 72%

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Jiang

Liang²,

Huang³

et al. 2021

Micromachines

View full text Add to dashboard Cite

show abstract

“…The CFD results in terms of pressure distributions were validated by comparison with the data by Gao et al and by Jakobsson [27]. Additionally, some authors have considered the thermal effects [28][29][30], which were further studied by Wang et al [31], Li et al [32], and Yang et al [29]. Other authors such as Liu et al and Dhande et al [33] investigated the fluid-structure interaction [34].…”

Section: Introductionmentioning

confidence: 88%

Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position

Concli

2020

Applied Sciences

View full text Add to dashboard Cite

For decades, journal bearings have been designed based on the half-Sommerfeld equations. The semi-analytical solution of the conservation equations for mass and momentum leads to the pressure distribution along the journal. However, this approach admits negative values for the pressure, phenomenon without experimental evidence. To overcome this, negative values of the pressure are artificially substituted with the vaporization pressure. This hypothesis leads to reasonable results, even if for a deeper understanding of the physics behind the lubrication and the supporting effects, cavitation should be considered and included in the mathematical model. In a previous paper, the author has already shown the capability of computational fluid dynamics to accurately reproduce the experimental evidences including the Kunz cavitation model in the calculations. The computational fluid dynamics (CFD) results were compared in terms of pressure distribution with experimental data coming from different configurations. The CFD model was coupled with an analytical approach in order to calculate the equilibrium position and the trajectory of the journal. Specifically, the approach was used to study a bearing that was designed to operate within tight tolerances and speeds up to almost 30,000 rpm for operation in a gearbox.

show abstract

“…In order to prove that the CFD method and its solution setup can be employed for thermo-hydro-dynamic (THD) analysis of the journal bearing, it must be shown that the results are correct and with specified accuracy. Here, the results in terms of the hydrodynamic pressure and the wall temperature distribution in the present study are compared with the numerical data of Li et al [44] as a reference under the same input conditions and computed operational parameters, with the exception that in the present study deformation is not taken into account in the CFD model. The comparison for these results is depicted in Figure 5.…”

Section: Validationmentioning

confidence: 96%

Investigation of the Tribological Performance of Heterogeneous Slip/No-Slip Journal Bearing Considering Thermo-Hydrodynamic Effects

Tauviqirrahman

Afif

Paryanto

et al. 2021

Fluids

View full text Add to dashboard Cite

The slip boundary has an important influence on hydrodynamic journal bearing. However, less attention has been paid to the positive effect of slip on thermal behaviour. In this study, a computational fluid dynamics (CFD) analysis investigating the thermo-hydrodynamic (THD) characteristics of heterogeneous slip/no-slip bearings running under steady, incompressible, and turbulent conditions is presented. A comprehensive analysis is made to investigate the THD behaviours of heterogeneous slip/no-slip bearings in terms of lubricant pressure, temperature distribution, volume fraction of vapor, and load-carrying capacity when they are running under different shaft rotational speeds. The multiphase cavitation model is adopted to represent the real operational condition of the journal bearing. Numerical results show that the load-carrying capacity of the heterogeneous slip/no-slip bearing can be significantly increased by up to 100% depending on the rotational speed. It is also observed that there is an optimal journal rotational speed for maximizing the load-carrying capacity. An insightful new finding is revealed in a numerical framework, wherein it is found that by introducing the heterogeneous slip/no-slip pattern, the maximum temperature can be reduced by up to 25% in comparison with a conventional bearing.

show abstract

Investigations of the three-dimensional temperature field of journal bearings considering conjugate heat transfer and cavitation

Cited by 16 publications

References 35 publications

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Prediction on Flow and Thermal Characteristics of Ultrathin Lubricant Film of Hydrodynamic Journal Bearing

Journal Bearing: An Integrated CFD-Analytical Approach for the Estimation of the Trajectory and Equilibrium Position

Investigation of the Tribological Performance of Heterogeneous Slip/No-Slip Journal Bearing Considering Thermo-Hydrodynamic Effects

Contact Info

Product

Resources

About