Abstract Cryocooler regenerators can be fabricated by rolling strips of etched metal foil on a mandrel, or on a pulse tube, as described in earlier papers and in a U.S. patent.1,2,3 Early versions of regenerators of that type exhibited far less pressure drop than comparable stacked-screen regenerators.2 However, performance of cryocoolers equipped with regenerators bearing those early etch patterns proved to be inferior to performance of the same cryocoolers equipped with stacked screens.3 Possible explanations included irregularities in the etching process that created the flow passages; defects in the assembly process resulting in uneven distribution of flow over the cross section of the foil regenerators; porosity of the foil so great that the thermal mass of the regenerator was inadequate; and short, straight flow passages through the regenerator that greatly reduced heat transfer as well as pressure drop. Those hypotheses led to the design of patterns that would lengthen flow passages and induce secondary flows in etched passages that were oriented normal to the overall direction of flow. Porosity of the regenerators was also reduced. Tests with a low-frequency G-M type coaxial pulse tube cooler demonstrated major differences in performance with three different patterns of foil. Best performance was obtained using the regenerator with lowest porosity, highest pressure drop and, presumably, the largest induced secondary flows. A low temperature of 54.2 K and a maximum spread of 250.1 K between warm and cold ends of the pulse tube were achieved.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Improved Flow Patterns in Etched Foil Regenerator


    Beteiligte:
    Mitchell, M. P. (Autor:in) / Fabris, D. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.2003


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Improved Flow Patterns in Etched Foil Regenerator

    Mitchell, M. P. / Fabris, D. | British Library Conference Proceedings | 2003


    Testing Program for Etched Foil Regenerator Material

    Mitchell, Matthew / Gedeon, David / Wood, Gary et al. | AIAA | 2005




    A Microfabricated Involute-Foil Regenerator for Stirling Engines

    Tew, Roy / Ibrahim, Mounir / Danila, Daniel et al. | AIAA | 2007