Efficiency of short heat exchangers for helium vapor cooling
Abstract
We measured the heat transfer efficiency of short heat exchangers along the vent tube of a helium cryostat, and measured the temperature profile of the helium vapor along the vent tube. The results of our measurements show that the heat exchangers are in some cases considerably more efficient than indicated by simple model calculations. With a flow rate of 4.4×10-3 g/s, a heat-sink length of 7 cm is just long enough to sink 2.3 W at about 138 K with a few Kelvins temperature drop, while a 5 cm length is more than adequate to sink 0.5 W at 25 K.
- Publication:
-
Review of Scientific Instruments
- Pub Date:
- January 1991
- DOI:
- Bibcode:
- 1991RScI...62..214S
- Keywords:
-
- Cryostats;
- Gas Cooling;
- Heat Exchangers;
- Heat Transfer;
- Helium;
- Heat Sinks;
- Liquid Helium;
- Reynolds Number;
- Temperature Measurement;
- Fluid Mechanics and Heat Transfer