An Investigation of Regression Rate of the Melting Interface for Iron Burning in Normal Gravity and Reduced Gravity

    Volume 3, Issue 4 (April 2006)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Page Count: 12


    Ward, NR
    Postgraduate Students and Senior Lecturer, School of Engineering Systems, Queensland University of Technology (QUT), Brisbane, Qld

    Suvorovs, T
    Postgraduate Students and Senior Lecturer, School of Engineering Systems, Queensland University of Technology (QUT), Brisbane, Qld

    Steinberg, TA
    Postgraduate Students and Senior Lecturer, School of Engineering Systems, Queensland University of Technology (QUT), Brisbane, Qld

    (Received 27 October 2005; accepted 23 January 2006)

    Abstract

    This paper investigates the causes of increased regression rates of the melting interface for metals burning in reduced gravity. Promoted ignition tests have been conducted for 3.2-mm diameter iron rods during a transition from normal gravity to reduced gravity. Immediately upon transition to a reduced-gravity environment, a change in regression rate of the melting interface was evident. The rate was consistently 1.75 times higher in reduced gravity than in normal gravity. The sudden increase in regression rate of the melting interface indicates that it is due to a change in the geometry of the molten ball, rather than higher temperatures. A one-dimensional, steady state heat transfer model was developed, correlating regression rate of the melting interface to surface area of the solid/liquid interface. Evidence is presented suggesting that (a) the solid/liquid interface adopts a “dome” shape in reduced gravity, and (b) that this causes an increase in regression rate of the melting interface directly proportional to the increase in surface area of the solid/liquid interface.


    Paper ID: JAI13569

    DOI: 10.1520/JAI13569

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    Author
    Title An Investigation of Regression Rate of the Melting Interface for Iron Burning in Normal Gravity and Reduced Gravity
    Symposium Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres, 2006-10-20
    Committee G04