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Computational fluid dynamics modeling of fluid flow and heat transfer in the central pore of carbon nanopipes

机译：碳纳米管中心孔内流体流动和传热的计算流体动力学建模

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摘要

Carbon nanopipes, which can be employed in micro- and nano-fluidic devices, have some extraordinary mechanical, optical, flow and electrical properties. In addition, these devices can manipulate very small amounts of liquid. One of the main aspects of these pipes is an unusual enhancement in the flow rate, and it should be explored whether this enhancement can be justified by continuum fluid mechanics or not. Computational fluid dynamics were employed for exploring this phenomenon. To explore this unusual flow enhancement, different parameters, such as temperature, inlet pressure, tube diameter, tube length and slip length were used. With varying parameters, the slip length can explain this phenomenon. The heat transfer was also numerically investigated and an improvement in the heat transfer coefficient and the convective heat flux magnitude were observed for the carbon nanopipes. Then, based on the numerical investigation, correlations were developed for the friction factor and the Nusselt number, and these correlations were verified by the reported experimental data for nanopipes. Moreover, the effects of this slip length on the velocity profile was investigated and the observed shape of the velocity profile was also completely changed from convex to plug-like by importing the effect of slip length on the walls of the tubes.
机译：可以用于微流体和纳米流体设备的碳纳米管具有一些非凡的机械，光学，流动和电性能。此外，这些设备可以处理非常少量的液体。这些管道的主要方面之一是流量的不寻常提高，应该探讨这种提高是否可以通过连续流体力学来证明。计算流体动力学被用来探索这种现象。为了探索这种异常的流量增强，使用了不同的参数，例如温度，入口压力，管径，管长和滑移长度。使用不同的参数，滑移长度可以解释这种现象。还对传热进行了数值研究，并观察到碳纳米管的传热系数和对流热通量均得到改善。然后，在数值研究的基础上，建立了摩擦因数和Nusselt数的相关性，并通过报道的纳米管实验数据验证了这些相关性。此外，研究了该滑移长度对速度分布的影响，并且通过导入管壁上的滑移长度的影响，将速度分布的观察形状也从凸状完全转变为塞状。

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