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Publikācija: Development and CFD Simulation of Cryostat Thermal Shielding for a Portable HPGe Gamma Spectrometer

Publication Type Publication (anonimusly reviewed) in a journal with an international editorial board indexed in other databases
Funding for basic activity Research project
Defending: ,
Publication language English (en)
Title in original language Development and CFD Simulation of Cryostat Thermal Shielding for a Portable HPGe Gamma Spectrometer
Field of research 2. Engineering and technology
Sub-field of research 2.3 Mechanical engineering
Research platforms Materials, Processes, and Technologies
Authors Alan Henry Tkaczyk
Vladislavs Malgins
Oļegs Jakovļevs
Marti Jeltsov
Priit Primagi
Keywords Thermal design; heat transfer; Computational Fluid Dynamics; CFD; thermal shield; thermal flow simulation; vacuum chamber
Abstract Thermal shields can be used in cryogenic equipment to reduce heat transfer due to thermal radiation. Within High Purity Germanium (HPGe) gamma spectroscopy, cooling of the HPGe detector to cryogenic temperatures using a cryostat is important to guarantee accurate measurements and reliable performance. This paper reports the development of a lightweight thermal shield to function in a demanding environment, permitting the cryostat to achieve and maintain cryogenic temperatures; such advancement is essential for the development of a portable HPGe spectrometer with desirable performance characteristics. This paper combines knowledge in the theory of thermal shields with practical know-how in the application of these devices to high-vacuum cryostats. In this paper, the effect of vacuum degradation on the steady-state temperature distribution of thermal shield and its efficiency is considered. The temperature of the thermal shield is determined by the differential energy balance equation. By taking into account the thermal load due to radiation, the thermal conductivity of residual gases and shield’s supports, the steady-state temperature distribution in the axial direction of the shield is determined. A more complex model corresponding to the design of a real cryostat is simulated using Computational Fluid Dynamics (CFD) in the Star-CCM+ environment. The simulated results are compared with experimental data measured on an operating prototype of the cyrostat.
Hyperlink: https://www.journals.elsevier.com/applied-thermal-engineering 
Reference Tkaczyk, A., Malgins, V., Jakovļevs, O., Jeltsov, M., Primagi, P. Development and CFD Simulation of Cryostat Thermal Shielding for a Portable HPGe Gamma Spectrometer. Applied Thermal Engineering, 2019, Vol.1 No.1, pp.1-17. ISSN 1359-4311.
Additional information Citation count:
  • Scopus  0
ID 29077