The enhancement of heat transfer between parallel surfaces, including parallel plates, parallel disks, and two concentric pipes, is vital because of their wide applications ranging from lubrication systems to water purification processes. Various techniques can be utilized to enhance heat transfer in such systems. Adding nanoparticles to the conventional working fluids is an effective solution that could remarkably enhance the heat transfer rate. No published review article focuses on the recent advances in nanofluid flow between parallel surfaces; therefore, the present paper aims to review the latest experimental and numerical studies on the flow and heat transfer of nanofluids (mixtures of nanoparticles and conventional working fluids) in such configurations. For the performance analysis of thermal systems composed of parallel surfaces and operating with nanofluids, it is necessary to know the physical phenomena and parameters that influence the flow and heat transfer characteristics in these systems. Significant results obtained from this review indicate that, in most cases, the heat transfer rate between parallel surfaces is enhanced with an increase in the Rayleigh number, the Reynolds number, the magnetic number, and Brownian motion. On the other hand, an increase in thermophoresis parameter, as well as flow parameters, including the Eckert number, buoyancy ratio, Hartmann number, and Lewis number, leads to heat transfer rate reduction.

平行表面（包括平行板、平行盘和两个同心管）之间的热传递增强至关重要，因为它们的应用范围很广，从润滑系统到水净化过程。可以利用各种技术来增强此类系统中的热传递。在常规工作流体中添加纳米颗粒是一种有效的解决方案，可以显着提高传热率。没有已发表的评论文章关注平行表面之间纳米流体流动的最新进展；因此，本文旨在回顾有关纳米流体（纳米粒子和常规工作流体的混合物）在这种配置中的流动和传热的最新实验和数值研究。对于由平行表面组成并使用纳米流体运行的热系统的性能分析，有必要了解影响这些系统中流动和传热特性的物理现象和参数。从这篇综述中获得的重要结果表明，在大多数情况下，平行表面之间的传热速率随着瑞利数、雷诺数、磁数和布朗运动的增加而增强。另一方面，热泳参数以及流动参数（包括埃克特数、浮力比、哈特曼数和路易斯数）的增加会导致传热速率降低。从这篇综述中获得的重要结果表明，在大多数情况下，平行表面之间的传热速率随着瑞利数、雷诺数、磁数和布朗运动的增加而增强。另一方面，热泳参数以及流动参数（包括埃克特数、浮力比、哈特曼数和路易斯数）的增加会导致传热速率降低。从这篇综述中获得的重要结果表明，在大多数情况下，平行表面之间的传热速率随着瑞利数、雷诺数、磁数和布朗运动的增加而增强。另一方面，热泳参数以及流动参数（包括埃克特数、浮力比、哈特曼数和路易斯数）的增加会导致传热速率降低。