Enhanced Electrical Insulation and Heat Transfer Performance of Vegetable Oil Based Nanofluids

Figure 12

Positive streamer propagation images for pure oil (a) and nano-oil (b) with 0.03% vol. nanoparticles. Figures (a)(1–5) and (b)(1–5) are process of breakdown with 20 us interval. The breakdown time of nano-oil is larger than pure oil. Figures (a)(6) and (b)(6) are the streamer images of prebreakdown under applied voltage of 40 kV. Compared to pure oil, the length of streamer of nano-oil is shorter and streamer with greater number of branches.

(a)

(b)