团队博士生张立玉关于螺旋通道传热性能强化的研究成果“A novel spiral channel with the growing waviness on the sidewalls for compact high-effciency heat exchanger”发表于Applied Energy期刊。

Fig. 1. Schematic diagrams of the conventional SS channel and the proposed SW channel.

   (a)                                                                      (b)

Fig. 2. Comparison of Colburn factors j and Fanning friction factors f between SS channel and SW channel: (a) j; (b) f.

本研究针对紧凑式换热器提出了一种新型的螺旋通道，该通道侧壁具有周期性波状结构。研究基于数值模拟方法，比较了传统螺旋通道与螺旋波状通道内的流动特性与传热性能。研究结果表明，对于给定的换热量，螺旋波状通道的换热所需长度仅为传统螺旋通道的63.5%，因此应用新型螺旋通道可显著减小传统螺旋通道换热器体积。此外，周期性波状结构所带来的流动压降的增加（5.0-17.3%），远小于对螺旋通道换热效率的提升（14.4-72.3%）。本研究将有助于紧凑、高效换热器的设计与开发。

This study developed a novel spiral channel characterized by the wavy sidewalls for compact heat exchanger. The flow characteristics and heat transfer performance in a conventional spiral channel and a spiral wavy channel were numerically investigated and compared in the study. The results show that the required length of the spiral-wavy channel for a given heat transfer rate is only 63.5% of that of the smooth-spiral channel. Therefore, the volume of a heat exchanger with spiral channels can be reduced remarkably by applying the proposed structure. Besides, the increase in pressure drop (5.0-17.3%) brought by the periodical wavy structure is less important compared with the improvement of thermal performance (14.4-72.3%). The present work is expected to motivate the design of compact and high-efficiency heat exchangers.

论文链接:http://doi.org/10.1016/j.apenergy.2021.117332