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You searched on: Author: ray radebaugh

Displaying records 31 to 40 of 76 records.
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31. CALCULATED REGENERATOR PERFORMANCE AT 4 K WITH HELIUM-4 AND HELIUM-3
Published: 3/16/2008
Authors: Ray Radebaugh, Yonghua Huang, Agnes O¿Gallagher, John Gary
Abstract: The helium-4 working fluid in regenerative cryocoolers operating with the cold end near 4 K deviates considerably from an ideal gas. As a result, losses in the regenerator, given by the time-averaged enthalpy flux, are increased and are strong functi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50594

32. Impedance Measurements of Inertance Tubes at High Frequency and Pressure
Published: 7/16/2007
Authors: Michael A Lewis, Ryan Pierce Taylor, Peter E Bradley, Ray Radebaugh, Gershon Grossman, Zhihua Gan
Abstract: Previous comparisons between measured and calculated inertance tube impedance were made at frequencies below 70 Hz and average pressures below 3 MPa. In this paper, we present results on similar comparisons for frequencies up to 150 Hz and average pr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50595

33. MODELING AND EXPERIMENTS ON FAST COOLDOWN OF A 120 Hz PULSE TUBE CRYOCOOLER
Published: 7/16/2007
Authors: Srinivas Vanapalli, Michael A Lewis, Gershon Grossman, Zhihua Gan, Ray Radebaugh, H.J. M. ter Brake
Abstract: High frequency operation of a pulse tube cryocooler leads to reduced regenerator volume, which results in a reduced heat capacity and a faster cooldown time. A pulse tube cryocooler operating at a frequency of 120 Hz and an average pressure of 3.5 MP ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50593

34. EQUATION OF STATE AND THERMOPHYSICAL PROPERTIES OF HELIUM-3
Published: 4/3/2007
Authors: Yonghua Huang, G.B. Chen, V. Arp, Ray Radebaugh
Abstract: Experimental data of the thermophysical properties of 3He were mined into a searchable database. Equilibrium equations along the vapor-liquid and liquid-solid lines were proposed. A general equation of state for normal fluid 3He based on the Debye sp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50419

35. THE DEBYE FLUID STATE EQUATION
Published: 4/2/2007
Authors: V. Arp, Yonghua Huang, Ray Radebaugh, G.B. Chen
Abstract: We describe a new form of a fluid state equation, based on a conceptual extrapolation from the Debye equation for the specific heat of solid materials. The Debye characteristic temperature, theta, which is nominally a constant for solids, becomes a f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50420

36. 120Hz Pulse Tube Cryocooler for Fast Cooldown to 50K
Published: 2/13/2007
Authors: Srinivas Vanapalli, Michael A Lewis, Zhihua Gan, Ray Radebaugh
Abstract: A pulse tube cryocooler operating at 120 Hz with 3.5 MPa average pressure achieved a no-load temperature of about 49.9 K and a cooldown time to 80 K of 5.5 minutes. The net refrigeration power at 80 K was 3.35 W with an efficiency of about 22.6% of C ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50469

37. Characterization of Inertance Tubes Using Resonance Effects
Published: 6/14/2006
Authors: Michael A Lewis, Peter E Bradley, Ray Radebaugh, Zhihua Gan
Abstract: Inertance tubes can be characterized by their inertance, compliance, and resistance. All three of these impedance components are present during normal measurements of inertance tube impedance. As a result, in comparing experimental results with model ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50403

38. Proposed Rapid Cooldown Technique for Pulse Tube Cryocoolers
Published: 6/14/2006
Authors: Ray Radebaugh, Agnes O¿Gallagher, Michael A Lewis, Peter E Bradley
Abstract: Some cryocooler applications, such as those for military operations dealing with high temperature superconducting (HTS) magnets, motors, or generators, require faster cooldown times than what can normally be provided with a cryocooler designed to acc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50411

39. Inertance Tube Optimization for Pulse Tube Refrigerators
Published: 4/27/2006
Authors: Ray Radebaugh, Michael A Lewis, Ercang Lou, John M. Pfotenhauer, G. F. Nellis, L. F. Schunk
Abstract: The efficiency of regenerative refrigerators is generally maximized when the pressure and flow are in phase near the midpoint of the regenerator. Such a phase relationship minimizes the amplitude of the mass flow for a given acoustic power flow throu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50276

40. Regenerator Operation at Very High Frequencies for Microcryocoolers
Published: 4/27/2006
Authors: Ray Radebaugh, Agnes A. O'Gallagher
Abstract: The size of Stirling and Stirling-type pulse tube cryocoolers is dominated by the size of the pressure oscillator. Such cryocoolers typically operate at frequencies up to about 60 Hz for cold-end temperatures above about 60 K. Higher operating freque ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50244



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