Transient phenomena initiating phase transition in dilution refrigerator

•Extension of numerical simulation model (SIDFO) for transient phenomena in dilution refrigerator.•Optimization of isotopic gas mixture in dilution refrigerator through SIDFO.•Investigation of thermodynamic processes before steady state condition.•Importance of still power concerning phase separatio...

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Bibliographic Details
Published in:Cryogenics (Guildford) 2014-09, Vol.63, p.69-76
Main Authors: Pradhan, Jedidiah, Das, Nisith K., Chakrabarti, Alok
Format: Article
Language:English
Subjects:
Base temperature
Channels
Concentration (composition)
Condensation
Dilution
Evolution
Optimization
Phase separation
Refrigerators
Simulation
Transient phase
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Summary:•Extension of numerical simulation model (SIDFO) for transient phenomena in dilution refrigerator.•Optimization of isotopic gas mixture in dilution refrigerator through SIDFO.•Investigation of thermodynamic processes before steady state condition.•Importance of still power concerning phase separation during cool down.•Effect of liquid volumes in still and mixing chamber on phase separation interface. We have analysed the transient processes in a Dilution Refrigerator (DR) leading to phase separation of 3He–4He mixture into concentrated and dilute solutions using an extended SIDFO (Simulation of Integrated Dilution refrigerator For Optimisation) Pradhan et al. (2013) analysis tool. The evolution of the phase separation interface along the concentrated channel and its arrival in the mixing chamber for a given physical situation has been thoroughly examined. The significance of the 3He/4He composition in the mixer, the flow rate and the still power on the phase separation is presented here. The consequences of several relevant thermodynamic parameters and the composition of isotopic mixture for successful function of the DR is also discussed in this paper.
ISSN:0011-2275
1879-2235
DOI:10.1016/j.cryogenics.2014.07.005