• Effect of Frequency on Hydrodynamic Parameters of Mesh Fillers in Oscillatory Flow 

      Landrum, E. C.; Conrad, T. J.; Pathak, M. G.; Ghiaasiaan, S. M. (Seyed M.); Kirkconnell, Carl Scott; Crittenden, Thomas M.; Yorish, S. (Georgia Institute of TechnologyICC Press, 2008-05)
      An experimental investigation was carried out to determine the effect of frequency on the porous media hydrodynamic closure relations for steady periodic flow. Using room temperature helium as the working fluid, stacked ...
    • Measured and Calculated Performance of a High Frequency, 4 K Stage, He-3 Regenerator 

      Garaway, I.; Lewis, M. A.; Bradley, P. E.; Radebaugh, R. (Georgia Institute of TechnologyICC Press, 2008-05)
      Efficiencies of small 4 K cryocoolers are less than 1% of Carnot, whereas 80 K cryocoolers achieve efficiencies of up to almost 20% of Carnot. The primary loss mechanisms in low temperature regenerative cryocoolers are ...
    • Regenerator Friction Factor and Nusselt Number Information Derived from CFD Analysis 

      Cheadle, M. J.; Nellis, G. F.; Klein, S. A. (Georgia Institute of TechnologyICC Press, 2008-05)
      Macroscopic models used in the design and development of pulse tube cryocooler regenerators do not explicitly consider the complex microscopic interaction of the working fluid as it flows through the interstitial passages ...
    • Some Insights Into Stirling Machine Behavior 

      Tucker, A. S.; Gschwendtner, M. A.; Haywood, D. (Georgia Institute of TechnologyICC Press, 2008-05)
      Almost all practical cryocoolers embody, directly or indirectly, at least some elements of the Stirling cycle in its reversed form. Through its involvement in the analysis, design and development of both Stirling engines ...
    • Study of 35 K Regenerator Performance Operating at High Frequency 

      Wang, B.; Fan, B. Y.; Zhou, Wenjie; Gan, Zhihua; Qiu, Limin (Georgia Institute of TechnologyICC Press, 2008-05)
      The objective of this paper is to observe the regeneration performance of three different regenerator materials including stainless steel screen, lead screen and lead sphere at 35 K and at a high operating frequency. A ...
    • A Study of a Miniature In-Line Pulse Tube Cryocooler 

      Sobol, S.; Katz, Y.; Grossman, G. (Georgia Institute of TechnologyICC Press, 2008-05)
      A miniature pulse tube cryocooler has been designed and tested in our laboratory. The main part of the cryocooler, consisting of an in-line assembly of aftercooler, regenerator, cold heat exchanger, buffer tube and hot ...
    • Theoretical and Experimental Investigation on the Axial Temperature Mismatch and its Optimization for Coaxial Inertance Pulse Tube Cryocoolers 

      Wang, L. B.; Dang, H. Z.; Wu, Y. N.; Li, S. S.; Yang, K. X.; Xiong, C. (Georgia Institute of TechnologyICC Press, 2008-05)
      In a coaxial pulse tube cryocooler, the radial thermal conduction between the pulse tube and the regenerator has a large influence on cryocooler performance. Caused by the temperature mismatch between the pulse tube and ...
    • Thermal Dispersion and Convection Heat Transfer during Laminar Transient Flow in Porous Media 

      Pathak, M. G.; Ghiaasiaan, S. M. (Seyed M.) (Georgia Institute of TechnologyICC Press, 2008-05)
      Solid-fluid thermal interactions during unsteady flow in porous media play an important role in the regenerators of pulse tube cryocoolers. Pore-level thermal processes in porous media under unsteady flow conditions are ...