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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.


The variations of Qb, Qf, Qconv and Qvis with different cylindrical surface linear speed U.
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pone.0134806.g007: The variations of Qb, Qf, Qconv and Qvis with different cylindrical surface linear speed U.

Mentions: The cases shown in Table 5 were used to study the effect of the Reynolds number on the thermal effects of line contact THD lubrication. Tf data in Tables 5, 6 and 7 were measured and then taken as boundary conditions for calculations. Fig 7 shows the calculated results for the conduction rates Qb, Qf, the convection rate Qconv and the viscous dissipation rate Qvis. In Fig 7, positive values represent heat flowing into the computational domain or generated within it, whereas negative values represent heat dissipated within the computational domain or flowing out of it.


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)

The variations of Qb, Qf, Qconv and Qvis with different cylindrical surface linear speed U.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0134806.g007: The variations of Qb, Qf, Qconv and Qvis with different cylindrical surface linear speed U.
Mentions: The cases shown in Table 5 were used to study the effect of the Reynolds number on the thermal effects of line contact THD lubrication. Tf data in Tables 5, 6 and 7 were measured and then taken as boundary conditions for calculations. Fig 7 shows the calculated results for the conduction rates Qb, Qf, the convection rate Qconv and the viscous dissipation rate Qvis. In Fig 7, positive values represent heat flowing into the computational domain or generated within it, whereas negative values represent heat dissipated within the computational domain or flowing out of it.

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.