/sup 4/He-circulating dilution refrigerator

Journal Article · Fri May 01 04:00:00 EDT 1987 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681829· OSTI ID:6060429

Satoh, N; Satoh, T; Ohtsuka, T; Fukuzawa, N; Satoh, N

Investigations are reported on a dilution refrigerator through which superfluid /sup 4/He is circulated. First, discussions are given about the effectiveness of a counterflow tube heat exchanger in which the phase-separated concentrated and dilute phases directly contact each other. Then experimental results of the cooling behavior of their /sup 4/He-circulating dilution refrigerator are presented. It is found that the cooling characteristic of the machine changes abruptly when the /sup 4/He-circulating rate exceeds a certain critical value. In the circulation rate region above this critical value, a lowest temperature of 3.4 mK has been attained. On the basis of various experimental results such as the effect of heat input, effect of tilting the cryostat, and visual observation with a machine made of glass, discussions are given of the flow state of the descending cold dilute mixture in the counterflow tube.

• Research Organization: Tohoku Univ., Sendai, Japan
• OSTI ID: 6060429
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 67:3-4; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

420201 -- Engineering-- Cryogenic Equipment & Devices
640450* -- Fluid Physics-- Superfluidity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONTROL EQUIPMENT
COOLING
COUNTERFLOW SYSTEMS
CRYOGENICS
CRYOSTATS
DIAGRAMS
DIRECT CONTACT HEAT EXCHANGERS
ENERGY TRANSFER
EQUIPMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLOW RATE
FLOW VISUALIZATION
FLUID MECHANICS
HEAT EXCHANGERS
HEAT TRANSFER
HELIUM 3
HELIUM 4
HELIUM DILUTION REFRIGERATION
HELIUM DILUTION REFRIGERATORS
HELIUM ISOTOPES
HYDRAULICS
ISOTOPES
LIGHT NUCLEI
MECHANICS
NUCLEI
PERFORMANCE
PERFORMANCE TESTING
PHASE DIAGRAMS
REFRIGERATION
REFRIGERATORS
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE DISTRIBUTION
TEMPERATURE EFFECTS
TESTING
THERMAL BOUNDARY RESISTANCE
THERMOSTATS
ULTRALOW TEMPERATURE