Numerical analysis of a novel coaxial annular tube convective heat switch

Zhang，Yu1; Liao，Yi1; Zha，Kuifan2; Liu，Xuming1,2; Pan，Changzhao1,2

2024

10.1016/j.cryogenics.2023.103772

Cryogenics   影响因子和分区

0011-2275

Heat switches are commonly used in cryogenic instruments to provide thermal contact or isolation between the hot and cold masses over a temperature range from millikelvin to room temperature. This study presents a new type of convective thermal switch that implements an annular tube design replacing the twin-tube structure. To study the effects of geometry and operating parameters on thermal performance, a computational fluid dynamics (CFD) model is developed. The results show that the designed heat switch provides a thermal conductance of 33.79 mW/K when the end temperatures are 4.2 K and 40 K. In addition, it can automatically change to thermal isolation mode with a residual thermal conductance of 0.19 mW/K. The thermal conductance is increased from 33.79 mW/K to 38.90 mW/K by extending the length of the inner tube. This novel heat switch holds promise for precooling the modern cryogen-free dilution refrigerator (DR) and adiabatic demagnetization refrigerator (ADR).

CFD Coaxial annular tube Cryogenics Heat switch Natural convection

SCI

英语

第一 ; 通讯

PHYSICS

2-s2.0-85180419421

Scopus

1.Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.International Quantum Academy,Shenzhen,518048,China

Zhang，Yu,Liao，Yi,Zha，Kuifan,et al. Numerical analysis of a novel coaxial annular tube convective heat switch[J]. Cryogenics,2024,137.

Zhang，Yu,Liao，Yi,Zha，Kuifan,Liu，Xuming,&Pan，Changzhao.(2024).Numerical analysis of a novel coaxial annular tube convective heat switch.Cryogenics,137.

Zhang，Yu,et al."Numerical analysis of a novel coaxial annular tube convective heat switch".Cryogenics 137(2024).