| Title |
Experimental Investigation on the Cryogenic Thermosiphon Using N2 and CF4 Mixture as the Working Fluid |
| Authors |
김영권(Youngkwon Kim) ; 이지성(Jisung Lee) ; 정상권(Sangkwon Jeong) ; 한영희(Younghee Han) ; 정세용(Seyong Jung) ; 박병준(Byungjun Park) |
| Keywords |
극저온 열사이펀 ; 혼합 작동유체 ; 과도작동 Cryogenic thermosiphon ; Mixed working fluid ; Transient operation |
| Abstract |
A thermosiphon is utilized as a thermal shunt to reduce the cool-down time of a cryogenic system cooled by a two stage cryocooler. The cool-down time reduction by the thermosiphon is determined by the type of working fluid which is directly related to the operating temperature range of the thermosiphon. A mixed working fluid has a potential to widen the operation temperature range of the thermosipohon. In this study, the thermosiphon using N2 and CF4 mixture as the working fluid is fabricated and tested to verify its transient heat transfer performance. The thermosiphon with the mixed working fluid has no noticeable reduction of cool-down time compared with that of the thermosiphon with pure working fluid in this experiment. However, it seems that the thermosiphon with mixed working fluid may have an advantage according to the cooling capacity of a cryocooler, the cooling target temperature and the size of a cooling object. |