Effects of electromagnetic-vibration fan with folding blades on convective heat transfer. (August 2022)

• Record Type: Journal Article
• Authors: Hu, Jinqi; Wang, Kun; Xie, Liyao; Min, Chunhua; Rao, Zhonghao
• Is Part Of: Applied thermal engineering. Volume 213(2022)
• Publication Date: 2022-08
• Subjects: Electronic device -- Vibrating fan -- Folding blade -- Convective heat transfer; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2022.118651
• Languages: English
• ISSNs: 1359-4311

Abstract

Highlights: The effects of a vibrating fan on convective heat transfer were studied. A grooved folding blade was designed for enhancing convective heat transfer. Folding blades can increase vorticity and airflow velocity. The optimal folding number, depth and length of free-end are 7, 2 mm and 25 mm. Abstract: The electromagnetic-vibration fan is mainly composed of a pair of vibrating blades and an electromagnetic drive device. The electromagnetic force drives the blades to vibrate periodically, generating airflow for cooling electronic equipment. Optimising the fan blades at the same power consumption is a critical way to enhance convective heat transfer. The present work designed a new blade type with a three-dimensional groove structure, the folding blade, based on the rectangular blade. The effects of the electromagnetic-vibration fan with folding blades on convective heat transfer were investigated experimentally and numerically. The results show that the folding blade can increase the vorticity and air velocity. In comparison with the rectangular blade, the maximum airflow velocity increases by 0.9 m s −1, and the time-averaged and maximum temperatures decrease by 2.5 °C and 1.6 °C, respectively. The optimal folding number, folding depth and length of the free-end section are 7, 2 mm and 25 mm, respectively.