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Particle-water heat transfer during explosive volcanic eruptions

Woodcock, D. C. and Gilbert, Jennie and Lane, S. J. (2012) Particle-water heat transfer during explosive volcanic eruptions. Journal of Geophysical Research: Solid Earth, 117 (B10). ISSN 2169-9356

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    Abstract

    Thermal interaction between volcanic particles and water during explosive eruptions has been quantified using a numerical heat transfer model for spherical particles. The model couples intraparticle conduction with heat transfer from the particle surface by boiling water in order to explore heat loss with time for a range of particle diameters. The results are combined with estimates of particle settling times to provide insight into heat removal during eruption from samples of volcanic particles produced by explosive eruption. Heat removal is restricted by resistance to heat transfer from the volcanic particles with intraparticle thermal conduction important for large particles and surface cooling by boiling dominating for small particles. In most cases, volcanic particles approach thermal equilibrium with the surrounding fluid during an explosive eruption. Application of the results to a sample from the Gjalp 1996, Iceland eruption indicates that, relative to 0 degrees C, 70-80% of the heat is transferred from the particles to boiling water during the settling time before burial in the stratigraphic succession. The implication is that, for subglacial explosive eruptions, much of the heat content of the magma is coupled into melting ice extremely rapidly. If all particles of the Gjalp 1996 deposit were cooled to the local boiling point by the end of the eruption then approximately 78% of the initial heat content was removed from the erupting magma during the eruption. This is consistent with calorimetric calculations based on volumes of ice melted during and after the eruption.

    Item Type: Article
    Journal or Publication Title: Journal of Geophysical Research: Solid Earth
    Additional Information: ©2012. American Geophysical Union. All Rights Reserved
    Uncontrolled Keywords: boiling water ; heat transfer ; numerical model ; volcanic particle
    Subjects: UNSPECIFIED
    Departments: UNSPECIFIED
    ID Code: 60283
    Deposited By: ep_importer_pure
    Deposited On: 28 Nov 2012 09:09
    Refereed?: Yes
    Published?: Published
    Last Modified: 23 Jul 2014 15:07
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/60283

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