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You searched on: Author: ray radebaugh

Displaying records 11 to 20 of 76 records.
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11. A Polyimide Micro Heat Exchanger With a Suspended 3D Parallel Channel Structure for Cryogenic Application
Published: 11/11/2011
Authors: Yunda Wang, Ryan John Lewis, Mu Hong Lin, Yiwei Yan, Ray Radebaugh, Peter E Bradley, Yung-Cheng Lee
Abstract: A heat exchanger (HX) plays an important role in many cryogenic systems. This paper demonstrates a fully integrated fabrication process to make a novel monolithic polyimide micro heat exchanger. The structure of this heat exchanger consists of two p ...

12. 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 A. 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 ...

13. Cryocoolers for Aircraft Superconducting Generators and Motors
Published: 6/13/2011
Author: Ray Radebaugh
Abstract: The proposal by NASA to use high temperature superconducting (HTS) generators and motors on future (2035) aircraft for turboelectric propulsion imposes difficult requirements for cryocoolers. Net refrigeration powers of about 5 kW to 10 kW a ...

14. 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 ...

15. Temperature instability comparison of micro- and mesoscale Joule-Thomson cryocoolers employing mixed refrigerants
Published: 6/13/2011
Authors: Peter E Bradley, Ray Radebaugh, Ryan John Lewis, Mu Hong Lin, Yung-Cheng Lee
Abstract: Previously we demonstrated cryogenic cooling in a Joule-Thomson microcryocooler (MCC) with mixed refrigerants operating at pressure ratios of 16:1 that achieved stable temperatures of 140 K with transient temperatures down to 76 K with precooling of ...

16. 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 ...

17. 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 ...

18. Progress of A Low Pressure Mixed-Gas Joule-Thomson Micro-Cryocooler - Summary of Performance with 5 and 3 Component Mixtures
Published: 7/22/2010
Authors: Peter E Bradley, M.-H Lin, Ray Radebaugh, Marcia L Huber, Y.C. Lee
Abstract: Mixed-refrigerants offer greater minimum enthalpy difference for lower pressure ratios than pure gases such as Nitrogen or Neon. Two such mixtures, (5- and a 3-component) were employed in a compact Joule-Thomson microcryocooler (MCC). The 5-compon ...

19. 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 ...

20. Mixed Refrigerants for a Glass Capillary Micro Cryogenic Cooler
Published: 4/24/2010
Authors: Mu Hong Lin, Peter E Bradley, Marcia L Huber, Ryan John Lewis, Ray Radebaugh, Yung-Cheng Lee
Abstract: Optimized mixed refrigerants are applied in Joule-Thomson (JT) micro cryogenic coolers (MCC) to enhance efficiency. Mixed refrigerants deliver equivalent refrigeration power with much lower pressure ratio and flow rate compared to pure nitrogen r ...

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