• Are P-V and T-S Diagrams Meaningful for Regenerative Cryocoolers? 

      Kittel, Peter (Georgia Institute of TechnologyICC Press, 2008-05)
      P-V and T-S diagrams are commonly used tools to illustrate thermodynamic cycles. For recuperative cycles, it is easy to idealize a cycle so that the history of a gas element can be traced on P-V and T-S diagrams as it flows ...
    • 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 ...
    • 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 ...
    • 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 ...