Radhakrishnan Ravi, Farokhirad Samaneh, Eckmann David M, Ayyaswamy Portonovo S
Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, United States.
Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, United States.
Adv Heat Transf. 2019;51:55-129. doi: 10.1016/bs.aiht.2019.08.002. Epub 2019 Oct 4.
Nanoparticles submerged in confined flow fields occur in several technological applications involving heat and mass transfer in nanoscale systems. Describing the transport with nanoparticles in confined flows poses additional challenges due to the coupling between the thermal effects and fluid forces. Here, we focus on the relevant literature related to Brownian motion, hydrodynamic interactions and transport associated with nanoparticles in confined flows. We review the literature on the several techniques that are based on the principles of non-equilibrium statistical mechanics and computational fluid dynamics in order to simultaneously preserve the fluctuation-dissipation relationship and the prevailing hydrodynamic correlations. Through a review of select examples, we discuss the treatments of the temporal dynamics from the colloidal scales to the molecular scales pertaining to nanoscale fluid dynamics and heat transfer. As evident from this review, there, indeed has been little progress made in regard to the accurate modeling of heat transport in nanofluids flowing in confined geometries such as tubes. Therefore the associated mechanisms with such processes remain unexplained. This review has revealed that the information available in open literature on the transport properties of nanofluids is often contradictory and confusing. It has been very difficult to draw definitive conclusions. The quality of work reported on this topic is non-uniform. A significant portion of this review pertains to the treatment of the fluid dynamic aspects of the nanoparticle transport problem. By simultaneously treating the energy transport in ways discussed in this review as related to momentum transport, the ultimate goal of understanding nanoscale heat transport in confined flows may be achieved.
浸没在受限流场中的纳米颗粒存在于涉及纳米级系统中传热和传质的多种技术应用中。由于热效应和流体力之间的耦合，描述纳米颗粒在受限流中的输运带来了额外的挑战。在这里，我们关注与布朗运动、流体动力相互作用以及纳米颗粒在受限流中相关的输运的相关文献。我们回顾了基于非平衡统计力学和计算流体动力学原理的几种技术的文献，以便同时保持涨落耗散关系和主要的流体动力相关性。通过对选定例子的回顾，我们讨论了从胶体尺度到分子尺度与纳米级流体动力学和传热相关的时间动态的处理方法。从这篇综述中可以明显看出，在对诸如管道等受限几何形状中流动的纳米流体的热输运进行精确建模方面确实进展甚微。因此，此类过程的相关机制仍未得到解释。这篇综述表明，公开文献中关于纳米流体输运性质的信息往往相互矛盾且令人困惑。很难得出明确的结论。关于这个主题报道的工作质量参差不齐。这篇综述的很大一部分涉及纳米颗粒输运问题的流体动力学方面的处理。通过以本综述中讨论的与动量输运相关的方式同时处理能量输运，可能实现理解受限流中纳米级热输运的最终目标。
