Effects of rotation number on heat transfer and fluid flow in a three-pass serpentine passage with lateral outflow

• Published in: Journal of thermal analysis and calorimetry 2021, Vol.143 (1), p.309-325
• Main Authors: Zhang, Bo-lun, Zhu, Hui-ren, Liu, Cun-liang
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Computational fluid dynamics; Fluid flow; Heat transfer; Heat transfer coefficients; Inorganic Chemistry; Liquid crystals; Measurement Science and Instrumentation; Outflow; Physical Chemistry; Polymer Sciences; Reynolds number; Rotation; Serpentine
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-019-09186-5

The purpose of this study is to experimentally and numerically investigate the effects of rotation number on heat transfer and fluid flow in a three-pass serpentine passage with lateral outflow. In the present study, the rotation number varies from 0 to 0.09, and the inlet Reynolds number is 5000. The heat transfer coefficient distribution of the three-pass serpentine passage is measured using the transient liquid crystal technique. The current work fills the research gap of the effect of rotation number on heat transfer distribution in a three-pass serpentine passages with lateral outflow. The results of this study show that the span-wise-averaged Nusselt numbers in the region of l/ d   33.6 increase monotonically with the rotation number increasing, particularly in l/ d  = 6.4, with a maximum increase of 58.5%. However, the rotation reduces the Nusselt numbers of the middle passage by between 2.6 and 7.3% when the rotation number increases from 0 to 0.06. The area-averaged Nusselt numbers rapidly decrease in the area of A i  = 4; this phenomenon is more obvious at higher rotation numbers, and the maximum decrease is 34.6%. The pressure coefficient in the region of l/ d