Abstract A computational research was performed to analyze the electrohydrodynamic (EHD) convective heat transfer in a differentially heated dielectric-MWCNT nanofluid layer. The study was conducted on a square enclosure subjected to a temperature gradient between these two vertical walls as well as a potential difference between these horizontal walls. The enclosure was filled with MWCNT oil-based nanofluid; the MWCNT nanoparticles were dispersed in a perfectly insulating thermal oil with a volume fraction of hardly exceeded 0.4%. The governing equations were derived with the assumption of homogeneous nanofluid and were solved with employing finite volume method. Based on the obtained results, it was found that the increase of Rayleigh number, electric Rayleigh number and nanoparticle concentration enhanced the heat transfer. For high thermal and electric Rayleigh number values, the flow and heat transfer became time dependent and accordingly a frequency study was also performed. It was found that the inclusion of an electric field with the addition of nanoparticles led to a significant heat transfer enhancement of about 43%.

中文翻译：

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MWCNT - 加热外壳中的介电纳米流体的瞬态电流体动力对流和热传递

摘要 进行了计算研究，以分析差异加热的电介质-MWCNT 纳米流体层中的电流体动力学 (EHD) 对流热传递。该研究是在一个方形外壳上进行的，该外壳受到这两个垂直壁之间的温度梯度以及这些水平壁之间的电位差。外壳充满了多壁碳纳米管油基纳米流体；MWCNT 纳米颗粒分散在完全绝缘的导热油中，体积分数几乎不超过 0.4%。控制方程是在均质纳米流体的假设下导出的，并采用有限体积法求解。基于所得结果，发现瑞利数、电瑞利数和纳米颗粒浓度的增加增强了传热。对于高热和电瑞利数值，流动和热传递变得依赖于时间，因此还进行了频率研究。发现通过添加纳米粒子包含电场导致约 43% 的显着传热增强。