Experimental investigation into rotating loop thermosyphons for cooling shafts of motorized spindles
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ORIGINAL ARTICLE
Experimental investigation into rotating loop thermosyphons for cooling shafts of motorized spindles Fajing Li 1 & Jianmin Gao 2 & Xiaojun Shi 2 & Zhifeng Wang 1 & Daoyong Wang 1 Received: 23 October 2019 / Accepted: 14 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Shaft cooling using loop thermosyphons is an ideal method for cooling motorized spindles. To investigate this application, it was necessary to investigate the heat transfer performance of loop thermosyphons while in a state of rotation. This paper describes cooling a shaft with a set of loop thermosyphons as its cooling structures. These thermosyphons’ designs are described and a series of experiments were conducted with liquid filling ratio ranging within 15% - 60% under 1000 r·min−1. The experimental results show that the optimal liquid filling ratio (FR) range of the rotating loop thermosyphons was 15%–45% and the thermal resistance would increase rapidly with FR when FR>45% under 1000 r·min−1. Keywords Rotating loop thermosyphon . Shaft cooling . Heat transfer performance . Optimal filling ratio
1 Introduction A two-phase loop thermosyphon is a high efficiency passive heat transfer device. It does not require a power supply or pump [1]. It offers a new method to cool the shaft in a motorized spindle without a need for rotating seals. However, there are still two significant issues that limit the application of a loop thermosyphon to shaft cooling for motorized spindles. Firstly, the evaporation section and condensation section are in different pipes for a conventional loop thermosyphon, but they would be in the same pipe when it is applied to shaft cooling due to the thermal conductivity of the shaft. Secondly, a loop thermosyphon needs to spin with the shaft rather than remain Highlights Rotating loop thermosyphons for cooling motorized spindle shafts were studied A method for measuring heat transfer efficiency in rotating state was proposed The effects of centrifugal force and FR on heat transfer performance were analyzed * Xiaojun Shi [email protected] 1
School of Mechatronics Engineering, Foshan University, No.18, Jiangwan Road, Foshan, Guangdong 528000, People’s Republic of China
2
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, No.28, Xianning West Road, Xi’an, Shaanxi 710049, People’s Republic of China
stationary as it cools the shaft. It has been previously reported [2] that a loop thermosyphon works well when its evaporation and condensation sections are located in the same pipe, and its working principle is similar to that of a conventional loop thermosyphon. The heating and vaporization of the liquid in the evaporation section results in the pressure inside the evaporation section to become higher than that in the condensation section. The high temperature vapor generated in the evaporation section moves to the condensation section under the pressure difference. When the high-temperature vapor travels to the condensation section and c
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