纳米改性变压器油电导率改进模型

Modified Electrical Conductivity Model for Transformer Oil-Based Nanofluids

为了了解添加纳米颗粒对变压器油电导率的影响,合成制备了ZnO纳米改性变压器油。在此基础上,研究了纳米改性变压器油电导率随温度和纳米颗粒体积分数的变化规律,并提出了基于经典Maxwell电导率公式和动态电泳现象的新型纳米油流体电导率分析模型。实验结果表明,添加ZnO纳米颗粒较明显地增大了纳米改性变压器油的电导率,且其电导率值与纳米颗粒体积分数呈线性关系,与温度呈指数型增长关系,同时对比实验数据和计算值发现,以Maxwell电导率和电泳电导率为基础的新模型可以较好地解释纳米改性变压器油的电导率变化规律。

A new kind of nanofluids-based on transformer oil is prepared with ZnO nanoparticles synthesized by solvothermal reaction to investigate the influences of adding nanoparticles on electrical conductivity of Transformer oil.The mechanism how temperature and volumetric fraction affect electrical conductivity is also discussed.Then a modified model is introduced following Maxwell electrical conductivity equation and electrophoresis phenomenon.A linear dependence of the effective electrical conductivity on volumetric fraction is revealed,and the electrical conductivity exponentially heightens with temperature,which well coincides with the experimental data.