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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.


Schematic diagram of the apparatus.
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pone.0134806.g004: Schematic diagram of the apparatus.

Mentions: An experimental apparatus was developed to validate the credibility of the calculated results. The schematic of the test system are shown in Fig 4 and Fig 5. The flywheel was used to imitate the cylindrical surface’s rotation. Four electric heating bars were buried in the block to adjust Tb. A spring-rail mechanism was designed to restrict the block to slide only in the z axis direction and to generate the applied load F at the same time. The force sensor and the capacitance type sensor (Fig 5) were used to measure the applied load F and the oil film thickness δ0, respectively, and the parameters of these sensors are shown in Table 4.


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)

Schematic diagram of the apparatus.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0134806.g004: Schematic diagram of the apparatus.
Mentions: An experimental apparatus was developed to validate the credibility of the calculated results. The schematic of the test system are shown in Fig 4 and Fig 5. The flywheel was used to imitate the cylindrical surface’s rotation. Four electric heating bars were buried in the block to adjust Tb. A spring-rail mechanism was designed to restrict the block to slide only in the z axis direction and to generate the applied load F at the same time. The force sensor and the capacitance type sensor (Fig 5) were used to measure the applied load F and the oil film thickness δ0, respectively, and the parameters of these sensors are shown in Table 4.

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.