Now showing items 1-20 of 89

    • Inertance Tube and Reservoir Modeling: Meshing, Convergence and Friction Factors for Oscillating Flow 

      Dodson, C.; Razani, A.; Roberts, T. (Georgia Institute of TechnologyICC Press, 2008-05)
      Pulse tube refrigerators (PTRs) have made dramatic improvements in reliability, efficiency and usage, with the addition of the inertance tube helping to create the improvements. The combination of the inertance tube and ...
    • 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 ...
    • Development of High Efficiency 4 K Two-Stage Pulse Tube Cryocooler 

      Xu, M.; Takayama, H.; Nakano, K. (Georgia Institute of TechnologyICC Press, 2008-05)
      Sumitomo Heavy Industries has been continuously improving the efficiency of our 4K pulse tube cryocooler in order to make it exchangeable with our 4K GM cryocooler. In order to improve the performance, three development ...
    • MIRI Cooler System Design Update 

      Petach, M.; Durand, D.; Michaelian, M.; Raab, J.; Tward, E. (Georgia Institute of TechnologyICC Press, 2008-05)
      NASA, under the Cryogenic Fluid Management (CFM) Project, in partnership with Ball Aerospace Technologies Corporation (BATC), conducted a reduced boil-off demonstration employing an actively cooled thermal radiation shield. ...
    • Analysis of Multi-Stage Joule-Thomson Microcoolers 

      Cao, H. S.; Lerou, P. P. P. M.; Mudaliar, A. V.; Holland, H. J.; Derking, J. H.; Zalewski, D. R.; ter Brake, H. J. M. (Georgia Institute of TechnologyICC Press, 2008-05)
      Microcoolers machined from glass wafers based on Joule-Thomson (J-T) expansion have been investigated for many years at the University of Twente. After successful development of singlestage J-T microcoolers with a cooling ...
    • Effect of the Charged Pressure on GM Cryocooler Performance. 

      Nezuka, H.; Nakagome, H.; Ota, M.; Numazawa, T.; Masuyama, S.; Nakashima, N.; Ikeya, Y. (Georgia Institute of TechnologyICC Press, 2008-05)
      This paper presents experimental results that show that the refrigeration efficiency of GM refrigerators can be improved by applying a charged pressure. Recently, there has been remarkable progress in superconducting ...
    • Development of 15 K Pulse Tube Cold Fingers for Space Applications at CEA/SBT 

      Duval, J. M.; Charles, I.; Coynel, A.; Gauthier, A. (Georgia Institute of TechnologyICC Press, 2008-05)
      Pulse tube coolers for space applications have been developed for many years at CEA/SBT. After successful developments of products in the 50 – 80 K range, our focus has changed to temperature below 20 K. Our work is based ...
    • Experimental Investigation on a Single-Stage Stirling-Type Pulse Tube Cryocooler Working below 30 K 

      Ren, J.; Dai, Wei; Luo, Ercang; Wang, Xiaotao; Hu, Jianying (Georgia Institute of TechnologyICC Press, 2008-05)
      Stirling-type pulse tube cryocoolers are promising candidates for space application and for cooling HTS devices. Nevertheless, most single-stage Stirling-type pulse tube cryocoolers (SSPTCs) are unable to reach a cooling ...
    • Progress in the Development and Performance of a High Frequency 4 K Stirling-Type Pulse Tube Cryocooler 

      Bradley, P. E.; Radebaugh, R.; Garaway, I.; Gerecht, E. (Georgia Institute of TechnologyICC Press, 2008-05)
      Presently we are in the development process for a 4 K Stirling-type pulse tube cryocooler to support cooling requirements for a mobile THz detector system. In this paper we discuss the status of this development and the ...
    • Clearance Loss Analysis in Linear Compressor with CFD Method. 

      Zhou, Wenjie; Gan, Zhihua; Zhang, Xiaobin; Qiu, Limin; Wu, Yinzhe (Georgia Institute of TechnologyICC Press, 2008-05)
      The non-contact seal technology, referred to as clearance seals, is used in linear compressors and promises to maintain the linear compressor for long life operation. The present effort analyzes the aerodynamics in the ...
    • Enhanced Helium Compressor Operation for Sensitive Measuring Instrumentation 

      Sayles, T.; Martien, D.; Diederichs, J.; Sloan, J.; Bird, D.; Spagna, S. (Georgia Institute of TechnologyICC Press, 2008-05)
      The recent advances in the design of a new class of “energy smart” helium compressors are presented that reduces the operating cost of cryogenically cooled instrumentation. In these systems, the individual speed control ...
    • Experimental Study of Active Magnetic Regenerator (AMR) Composed of Spherical GdN 

      Hirayama, Y.; Okada, H.; Nakagawa, T.; Yamamoto, T. A.; Kusunose, T.; Numazawa, T.; Mastumoto, K.; Irie, T.; Nakamura, E. (Georgia Institute of TechnologyICC Press, 2008-05)
      An experimental study of an active magnetic regenerator (AMR) employing GdN was carried out. Spherical GdN material was synthesized by the hot isostatic pressing (HIP) method. The specific heat was measured and the ...
    • Numerical Modeling on Reciprocating Active Magnetic Refrigeration Regenerator at Room Temperature 

      Li, Jing; Numazawa, T.; Matsumoto, K.; Nakagome, H. (Georgia Institute of TechnologyICC Press, 2008-05)
      A 2-dimension porous media model has been constructed for Reciprocating Active Magnetic Refrigeration Regenerator (AMR). The 2-D model is solved using a fully implicit (in time and space) discretization of the 2-dimension ...
    • Developments of 1-4 K Class Space Mechanical Coolers for New Generation Satellite Missions in JAXA 

      Shinozak, K.; Sugita, H.; Sato, Y.; Mitsuda, K.; Nakagawa, T.; Fujimoto, R.; Narasaki, K.; Kanao, K.; Tsunematsu, S.; Otsuka, K. (Georgia Institute of TechnologyICC Press, 2008-05)
      Mechanical coolers are a key enabling technology to utilize low temperature scientific instruments for the new generation of space science missions, such as the new X-ray astronomical satellite Astro-H, and the new infrared ...
    • 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 ...
    • Development of SITP’s Large Capacity High Frequency Coaxial Pulse Tube Cryocoolers 

      Dang, H. Z.; Wang, L. B.; Wu, Y. N.; Li, S. S.; Yang, K. X.; Shen, W. B.; Fu, H. (Georgia Institute of TechnologyICC Press, 2008-05)
      Large capacity high frequency single-stage coaxial inertance pulse tube cryocoolers have been developed and are becoming mature in SITP/CAS. The main objective of the development is to provide larger low-noise cooling ...
    • Development of a Moving Magnet Linear Motor Pressure Wave Generator for a Pulse Tube Refrigerator 

      Jacob, S.; Ramanarayanan, V.; Karunanithi, R.; Damu, C.; Jagadish, G.; Achanur, M.; Manjunatha, R.; Prabhu, R. S.; Kumar, J. Kranthi; Gour, A.; Gaunekar, A. S. (Georgia Institute of TechnologyICC Press, 2008-05)
      A pressure wave generator (PWG) is the most critical component of a high frequency pulse tube cooler which is finding increased use in aerospace and ground applications, including the telecommunication sector. High efficiency, ...
    • Performance Investigation on SITP’s 60 K High Frequency Single-Stage Coaxial Pulse Tube Cryocoolers. 

      Dang, H. Z.; Wang, L. B.; Wu, Y. N.; Li, S. S.; Yang, K. X.; Shen, W. B. (Georgia Institute of TechnologyICC Press, 2008-05)
      A series of 60 K high frequency single-stage coaxial pulse tube cryocoolers has been developed to provide reliable low-noise cooling at 60 K for space-borne long wave infrared focal plane arrays. The development goal and ...
    • 10 K Airborne Cryocooler and High Efficiency Heat Exchangers 

      Gully, W.; Hendershott, P.; Marquardt, D.; Glaister, D.; Wilson, C. (Georgia Institute of TechnologyICC Press, 2008-05)
      Ball Aerospace has designed, built, and characterized a compact refrigeration system for cooling very low temperature infrared imagers. The system is robust, will be integrated into an airborne application, and can also ...
    • Liquid Nitrogen Energy Storage Units 

      Afonso, J.; Catarino, I.; Martins, D.; Duband, L.; Patrício, R.; Bonfait, G. (Georgia Institute of TechnologyICC Press, 2008-05)
      The energy storage units (ESU) described in this article are to be attached to the cold finger of a cryocooler with the objective of holding the low temperature environment constant while the cooler may be temporarily ...