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LIQUID HELIUM COMPOSITE REGENERATOR MATERIAL

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 5224
Amount: $228,000.00
Phase: Phase II
Program: SBIR
Solicitation Topic Code: N/A
Solicitation Number: N/A
Timeline
Solicitation Year: N/A
Award Year: 1988
Award Start Date (Proposal Award Date): N/A
Award End Date (Contract End Date): N/A
Small Business Information
P.o. Box 85608
San Diego, CA 92121
United States
DUNS: N/A
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 () -
Business Contact
 TIMOTHY R. KNOWLEES
Title: RESEARCH PHYSICIST
Phone: () -
Research Institution
N/A
Abstract

IT IS PROPOSED TO PERFORM HEAT TRANSFER TESTS ON A NOVEL CRYOGENIC COMPOSITE MATERIAL DESIGNED FOR APPLICATION TO GAPREGENERATORS IN CRYOCOOLERS OPERATING NEAR 4.2 K. THE MATERIAL TO BE CONSTRUCTED FOR TESTING IS A COMPOSITE OF LIQUID HELIUM SELF-LOADED INTO A METALLIC EXTENDED SURFACE STRUCTURE WHOSE DISPERSION FORM IS DETERMINED BY THE THERMALFLUX AND FREQUENCY REQUIREMENTS OF SMALL CRYOCOOLERS. IT ISDESIGNED TO HAVE BOTH HIGH EFFECTIVE HEAT CAPACITY IN THE 3 K TO 6 K RANGE - DUE TO THE HELIUM VAPORIZATION AND RECONDENSATION - AND HIGH UNIAXIAL THERMAL CONDUCTIVITY DUE TO THE METALLIC COMPONENT. DURING THE REGENERATION CYCLE A VAPOR BUBBLE GROWS AND COLLAPSES COMPLETELY WITHIN THE STRUCTURE WHICH IS APPROXIMATELY 1 MM THICK. HEAT-TRANSFER EXPERIMENTS ARE PROPOSED TO MEASURE THE THERMAL PENETRATION INTO THE COMPOSITE MATERIAL AND TO TEST THE VALIDITY OF A MODEL WHICH HAS BEEN SHOWN TO APPLY TO METAL/PHASE-CHANGE-MATERIAL COMPOSITES NEAR ROOM TEMPERATURE. PHASE I TASKS WILL INCLUDE: (1) ANALYSIS AND MODELING OF THECOMPOSITE MATERIAL, (2) FABRICATION OF TEST SAMPLES, AND (3) THERMAL PENETRATION TESTS IN A HELIUM CRYOSTAT.

* Information listed above is at the time of submission. *

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