Souza Reinaldo R, Faustino Vera, Gonçalves Inês M, Moita Ana S, Bañobre-López Manuel, Lima Rui
Metrics, Mechanical Engineering Department, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
Advanced (Magnetic) Theranostic Nanostructures Lab, International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal.
Nanomaterials (Basel). 2022 Jul 22;12(15):2526. doi: 10.3390/nano12152526.
Fluids containing colloidal suspensions of nanometer-sized particles (nanofluids) have been extensively investigated in recent decades with promising results. Driven by the increase in the thermal conductivity of these new thermofluids, this topic has been growing in order to improve the thermal capacity of a series of applications in the thermal area. However, when it comes to measure nanofluids (NFs) thermal conductivity, experimental results need to be carefully analyzed. Hence, in this review work, the main traditional and new techniques used to measure thermal conductivity of the NFs are presented and analyzed. Moreover, the fundamental parameters that affect the measurements of the NFs' thermal conductivity, such as, temperature, concentration, preparation of NFs, characteristics and thermophysical properties of nanoparticles, are also discussed. In this review, the experimental methods are compared with the theoretical methods and, also, a comparison between experimental methods are made. Finally, it is expected that this review will provide a guidance to researchers interested in implementing and developing the most appropriate experimental protocol, with the aim of increasing the level of reliability of the equipment used to measure the NFs thermal conductivity.
近几十年来,含有纳米级颗粒胶体悬浮液的流体(纳米流体)得到了广泛研究,成果颇丰。受这些新型热流体热导率增加的驱动,为提高热领域一系列应用的热容量,该主题不断发展。然而,在测量纳米流体(NFs)的热导率时,实验结果需要仔细分析。因此,在本综述工作中,介绍并分析了用于测量纳米流体热导率的主要传统技术和新技术。此外,还讨论了影响纳米流体热导率测量的基本参数,如温度、浓度、纳米流体的制备、纳米颗粒的特性和热物理性质。在本综述中,将实验方法与理论方法进行了比较,同时也对实验方法之间进行了比较。最后,期望本综述能为有兴趣实施和开发最合适实验方案的研究人员提供指导,以提高用于测量纳米流体热导率设备的可靠性水平。