Príspevok
Effect of probe sonication time on nano-lubricant stability
DOI: 10.18462/iir.compr.2024.0613
Sekcia: Compressors and oils
Stav prijatia: Abstrakt prijatý
Autori
| Meno | Organizácia | |
|---|---|---|
| Asasei Unarine Casey Ndanduleni, Doctor of Engineering in Mechanical Engineering | Tshwane University of Technology | |
| Teboho Ramathe, Doctor of Engineering in Mechanical Engineering | Tshwane University of Technology | |
| Bongani Hadebe, Doctor of Engineering in Mechanical Engineering | Tshwane University of Technology | |
| Zhonglie Huan, Doctor of Philosophy(PhD) | Tshwane University of Technology |
Abstrakt
Advancement in nanotechnology research has led to the development of nanofluids in a pursuit to minimise energy consumption in thermal systems. Nanofluids possesses enhanced heat transfer characteristics due to the dispersion of metal or metal oxides nanoparticles into the base fluid. These nanoparticles have high thermal conductivity which renders them distinctive for heat transfer enhancement.
A nanofluid is also termed nanolubricant, this means nanoparticles can be dispersed in lubricating oil. Compressor oil serves as a lubricant and as a heat transfer fluid. Therefore, improving lubricating oil thermal properties is beneficial for a compressor. A well prepared nano-lubricant has been found to offer enhanced tribological characteristics such as wear resistance and lubrication in the compressor.
Stability degradation in nano-lubricants is a key concern for long term application. Nanoparticles tend to form aggregates which then leads to sedimentation, this causes stability degradation. However, an ultrasonication process can be utilised during preparation to disperse large clusters into individual nanoparticle. Literature has shown that there is no standard sonication time for different nano-lubricants used by different researchers. Other researchers do not evaluate nano-lubricant stability after sonication, and some give minimal attention to sonication time. Therefore, it is crucial to investigate how sonication time affects nanofluid stability.
On this study, nano-lubricant to be used is polyolester oil (POE)/copper oxide (CuO). A two-step preparation method will be used. The CuO nanoparticles will be dispersed through a probe-sonicator at room temperature. The sonication time will be for 30 minutes, 1 hour, 1 hour 30 minutes, 2 hours, 2 hours 30 minutes, and 3 hours. Nano-lubricant stability will be evaluated for each sonication time. This study will investigate the effect of probe sonication time on nano-lubricant stability. The optimum sonication time for POE/CuO will be determined. A Transmission electron microscope (TEM), Ultraviolet-Visible (UV-Vis) Spectrophotometer, Zeta potential (ZP), and visual observation was used for stability evaluation.
Kľúčové slová
Nano-lubricant
Sonication
Stability evaluation
Heat transfer