| Title |
Heat Transfer above Liquid Helium Surface in Cryostat |
| Authors |
최연석(Yeon Suk Choi) ; 김동락(Dong Lak Kim) ; 신동원(Dong Won Shin) |
| Keywords |
열전달 ; 자연대류 ; 극저온용기 Heat transfer ; Natural convection ; Cryostat |
| Abstract |
The cryogenic cooling load from the top plate of cryostat to liquid helium surface, including wall conduction, thermal radiation and current leads, is investigated in a closed cryostat system for superconducting magnet. In general methods of load estimation, individual load is calculated separately, however they are actually coupled each other because of natural convection of helium vapor. Using relevant heat transfer analysis, we calculate cryogenic load with taking into account the effect of natural convection. Cryogenic load is under-estimated approximately 1% when the natural convection is ignored. The difference between actual cooling load and cooling load by individual calculation increases with supplying current. |