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A Thermal Equilibrium Analysis of Line Contact Hydrodynamic Lubrication Considering the Influences of Reynolds Number, Load and Temperature.

Yu X, Sun Z, Huang R, Zhang Y, Huang Y - PLoS ONE (2015)

Bottom Line: These variations have caused some inconsistencies in the conclusions of different researchers regarding the relative contributions of these thermal effects.The results indicate that the contribution of each thermal effect sharply varies with the Reynolds number and temperature.Convective effect could be dominant under certain conditions.

View Article: PubMed Central - PubMed

Affiliation: Department of Energy Engineering, Zhejiang University, Hangzhou, 310027, China.

ABSTRACT
Thermal effects such as conduction, convection and viscous dissipation are important to lubrication performance, and they vary with the friction conditions. These variations have caused some inconsistencies in the conclusions of different researchers regarding the relative contributions of these thermal effects. To reveal the relationship between the contributions of the thermal effects and the friction conditions, a steady-state THD analysis model was presented. The results indicate that the contribution of each thermal effect sharply varies with the Reynolds number and temperature. Convective effect could be dominant under certain conditions. Additionally, the accuracy of some simplified methods of thermo-hydrodynamic analysis is further discussed.

No MeSH data available.


Results of the grid independence calculation.
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pone.0134806.g003: Results of the grid independence calculation.

Mentions: In this paper, 10 structured grid schemes have been used to reach grid independency, and the details of these grids are shown in Table 3. With boundary conditions of U = 11.40 m/s, Tinlet = 70°C, F = 300 N, and Tb = 100°C, the calculated δ0 was 12.43 μm. The Laminar viscous model, the SIMPLEC algorithm, the no slip wall shear condition were utilized. The results of the calculation in Fig 3 shows that the results of grids #8, #9 and #10 are very similar, thus further refinement of the grid would barely influence the simulation results. Therefore, the #8 grid discretization scheme was used in further studies in this paper.


A Thermal Equilibrium Analysis of Line Contact Hydrodynamic Lubrication Considering the Influences of Reynolds Number, Load and Temperature.

Yu X, Sun Z, Huang R, Zhang Y, Huang Y - PLoS ONE (2015)

Results of the grid independence calculation.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526673&req=5

pone.0134806.g003: Results of the grid independence calculation.
Mentions: In this paper, 10 structured grid schemes have been used to reach grid independency, and the details of these grids are shown in Table 3. With boundary conditions of U = 11.40 m/s, Tinlet = 70°C, F = 300 N, and Tb = 100°C, the calculated δ0 was 12.43 μm. The Laminar viscous model, the SIMPLEC algorithm, the no slip wall shear condition were utilized. The results of the calculation in Fig 3 shows that the results of grids #8, #9 and #10 are very similar, thus further refinement of the grid would barely influence the simulation results. Therefore, the #8 grid discretization scheme was used in further studies in this paper.

Bottom Line: These variations have caused some inconsistencies in the conclusions of different researchers regarding the relative contributions of these thermal effects.The results indicate that the contribution of each thermal effect sharply varies with the Reynolds number and temperature.Convective effect could be dominant under certain conditions.

View Article: PubMed Central - PubMed

Affiliation: Department of Energy Engineering, Zhejiang University, Hangzhou, 310027, China.

ABSTRACT
Thermal effects such as conduction, convection and viscous dissipation are important to lubrication performance, and they vary with the friction conditions. These variations have caused some inconsistencies in the conclusions of different researchers regarding the relative contributions of these thermal effects. To reveal the relationship between the contributions of the thermal effects and the friction conditions, a steady-state THD analysis model was presented. The results indicate that the contribution of each thermal effect sharply varies with the Reynolds number and temperature. Convective effect could be dominant under certain conditions. Additionally, the accuracy of some simplified methods of thermo-hydrodynamic analysis is further discussed.

No MeSH data available.