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You searched on: Author: Ray Radebaugh

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1. Performance Analysis of an Integrated Micro Cryogenic Cooler and Miniature Compressor for Cooling to 200 K
Published: 6/24/2013
Authors: Ryan John Lewis, Mu Hong Lin, Yunda Wang, Jill Cooper, Peter E Bradley, Ray Radebaugh, Marcia L Huber, Yung-Cheng Lee
Abstract: Joule-Thomson (J-T) based micro cryogenic coolers (MCCs) are attractive because they can provide the cryogenic temperatures needed for small electronic devices while having a low cost and small volumetric footprint. A compressor is a major part of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910850

2. Effect of Flow-Pressure Phase on Performance of Regenerators in the Range of 4 K to 20 K
Published: 6/17/2013
Authors: Michael A Lewis, Ryan Pierce Taylor, Peter E Bradley, Ray Radebaugh
Abstract: Modeling with REGEN3.3 has shown that the phase between flow and pressure at the cold end of 4 K regenerators has a large effect on their second-law efficiency. The use of inertance tubes in small 4 K pulse tube cryocoolers have limited phase shifti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914237

3. Experimental investigation of Low-pressure refrigerant mixtures for Micro Cryogenic Coolers
Published: 2/4/2013
Authors: Ryan John Lewis, Yunda Wang, Peter E Bradley, Marcia L Huber, Ray Radebaugh, Y. C. Lee
Abstract: Micro Cryogenic Coolers (MCCs) can achieve very small sizes and high efficiencies when operating with a refrigerant mixture, but micro-scale compressors have a limited pressure output. Four refrigerant mixtures were designed to operate between 0.4 MP ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911395

4. Enthalpy change measurements of a mixed refrigerant in a microcryogenic cooler in steady and pulsating flow regimes
Published: 8/29/2012
Authors: Ryan John Lewis, Yunda Wang, Mu Hong Lin, Marcia L Huber, Ray Radebaugh, Yung-Cheng Lee
Abstract: Micro cryogenic coolers (MCCs) are useful to a number of small electronic devices which require low cooling power. The cooling power of MCCs operating with mixed refrigerants in a Joule-Thompson (J-T) cycle can be calculated based on enthalpy calcula ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909802

5. DEMONSTRATION OF AN INTEGRATED MICRO CRYOGENIC COOLER AND MINIATURE COMPRESSOR FOR COOLING TO 200 K
Published: 11/17/2011
Authors: Ryan John Lewis, Mu Hong Lin, Yunda Wang, Jill Cooper, Peter E Bradley, Ray Radebaugh, Marcia L Huber, Yung-Cheng Lee
Abstract: Joule-Thompson (J-T) based micro cryogenic coolers (MCCs) are attractive because they can provide the cryogenic temperatures needed for small electronic devices while having a low cost and small volumetric footprint. A compressor is a major part of a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909136

6. Secondary Pulse Tubes and Regenerators for Coupling to Room-Temperature Phase Shifters in Multistage Pulse Tube Cryocoolers
Published: 10/3/2011
Authors: Ray Radebaugh, Agnes (Abbie) O'Gallagher, John M. Gary
Abstract: Multistage pulse tube cryocoolers require separate phase shifters for each stage. For sufficiently high frequency and acoustic power, the inertance tube is commonly used for such phase shifting. For Stirling-type, multistage pulse tube cryocoolers ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906112

7. Experiments with Linear Compressors for Phase Shifting in Pulse Tube Cryocoolers
Published: 6/13/2011
Authors: Michael A Lewis, Peter E Bradley, Ray Radebaugh
Abstract: For the past year NIST has been investigating the use of mechanical phase shifters as warm expanders for pulse tube cryocoolers. Unlike inertance tubes, which have a limited phase shifting ability at low acoustic powers, mechanical phase shifters hav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908960

8. Micro Cryogenic Coolers for IR Imaging
Published: 4/29/2011
Authors: Ryan John Lewis, Yunda Wang, Jill Cooper, Mu Hong Lin, Victor M. Bright, Yung-Cheng Lee, Peter E Bradley, Ray Radebaugh, Marcia L Huber
Abstract: Joule-Thomson micro cryogenic coolers (MCCs) are a preferred approach for small and low power cryocoolers. With the same heat lift, MCC‰s power input can be only 1/10 of a thermoelectric cooler‰s input, and MCC‰s size can be only 1/10 of a Stirling c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908496

9. Model for Transient Behavior of Pulse Tube Cryocooler
Published: 1/1/2011
Authors: Gershon Grossman, Peter E Bradley, Michael A Lewis, Ray Radebaugh
Abstract: This article describes an investigation of the transient behavior of a small (2.0 W at 85 K) Pulse Tube cryocooler operating at 120 Hz with an average pressure of 3.5 MPa, capable of relatively fast cool-down to about 60 K. In a series of experiments ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906312

10. Effect of Component Geometry on Flow Nonuniformities in a Large Pulse Tube Cryocooler
Published: 5/17/2010
Authors: Michael A Lewis, Ryan P. Taylor, Ray Radebaugh, Peter E Bradley
Abstract: A single-stage pulse tube cryocooler was designed to achieve 50 W of refrigeration power at 50 K when driven by a pressure oscillator that can produce up to 2.8 kW of acoustic power at 60 Hz. Initial experimental data produced no-load temperatures t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905871



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