| Abstrakt: |
This article presents an experimental study on the influence of titania and alumina nanoparticles on mineral and vegetable oils (VOs). For this purpose, three types of nanofluids are prepared in the laboratory. First, nanofluids are prepared with titanium oxide (TiO2) or Al2O3 nanoparticles dispersed in mineral or vegetable oil. Next, the mixture of these two types of nanoparticles (maintaining a certain ratio) is dispersed in mineral or vegetable oil. After that, the mineral and vegetable oils are mixed (in a certain ratio), in which TiO2 or Al2O3 nanoparticles are dispersed. Then, the prepared samples are subjected to ac breakdown voltage (ACBDV) measurement. Again for estimating the average ACBDVs with 1%, 10%, and 50% risk probabilities, Weibull distribution functions are chosen to apply. With the conformity test, it is found that the breakdown voltage (BDV) data for most of the prepared nanofluids follow Weibull distributions. From the experimental results, it is observed that the ACBDV can be enhanced up to 71% and 67% by dispersing hybrid nanoparticles in mineral and vegetable oil, respectively. Further, it may be observed that mixed oil with TiO2 dispersion can enhance breakdown voltage up to 27%. Moreover, the effect of nanoparticles on ac conductivity at different stages of frequencies is studied by the ladder phenomenon occurred in ac conductivity. |
