Wire-packed heat exchangers for dilution refrigerators.
Very simple wire-packed step heat exchangers for dilution refrigerators are described. No sintering is used in fabrication. Flow impedances and thermal resistance between the liquid and the copper wires are low. A refrigerator with five wire-packed heat exchangers in addition to a countercurrent heat exchanger attains a temperature of 11.4 mK with a single mixing chamber and 6.1 mK with two mixing chambers. High cooling power is achieved at modest (3)He circulation rates.
Polturak
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Department of Physics and Astronomy, Tel-Aviv University, Ramat-Aviv, Israel.
Rappaport
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Rosenbaum
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