This study used the Al2O3 nano-lubricant produced from the direct synthesis method was
used as the experimental samples and the ultrasonic vibration was used for dispersing the
nanoparticles into three types of the weight fraction (0.1, 0.2, 0.3%wt). The base solvent was the
lubricant of vacuum pump. The objectives of this study were to discuss the dependence of operating
temperature of vacuum pump under the various weight fraction of Al2O3 nanoparticles. In this
experiment we added Al2O3 nano-lubricant into the direct drive oil sealed rotary vacuum pump, and
used the thermocouple measure the temperature on the four test points (cylinder, in-lubricant, case
of vacuum pump and discharge pipeline). The results show that the cylinder temperature was
reduced by 1.3% and increased by 0.4%, 1.8%, the lubricant temperature was increased by 5.3%,
0.5% and 1.9%, the case surface temperature was reduced by 1.7%, 1.4% and 1.5%, and discharge
pipeline temperature was reduced by 0.6%, 2.1% and 3.8% respectively when the sample fractions
were 0.1%, 0.2% and 0.3%wt. From the results, it could be realized that the nano-lubricant has
more effects on increasing the performance of heat sink than conventional lubricant.
New Expression of Evacuating Speed of a Rotary Vacuum Pump