Experimental Characterization of the Joule-Thomson Cryostat of a Cryoprobe[J]. Journal of refrigeration, 2012, 33(5). DOI: 10.3969/j.issn.0253-4339.2012.05.074.
Various experiments were conducted to measure the temperature and flow rate of a Joule-Thomson cryostat corresponding to different precooling temperatures of nitrogen and thermalload. The results demonstrated that the steady-state temperature of cryoprobe changed with precooling temperature
and that the greater the thermal load
the lower the requisite precooling temperature of the nitrogen passing through the Joule-Thomson cryostat. The experiments further indicated that too low precooling temperature of nitrogen is not necessary as it may cause a great waste of nitrogen and lower heat exchanger efficiency; and the nitrogen flow rate increased as the outlet temperature of supply nitrogen decreased. The calculated results of nitrogen flow rate correlated well with the experimental measurement.