Abstract
Geophysical granular flows occur at the surface of the Earth and other planets with reduced atmospheric pressure. In this paper, we investigate the run-out of dam-break flows of particle-air mixtures with fine (\(d=75\,\upmu {\hbox {m}}\)) or coarse (\(d=150\,\upmu {\hbox {m}}\)) grains in a flume with different bottom roughness (\(\delta\)) and vacuum degrees (\(P^*\)). Our results reveal an increase of the flow run-out as \(d/\delta\) decreases for fine \(d=75 \,\upmu {\hbox {m}}\)-particles, and run-out decreases with the dimensionless ambient pressure (\(P^*\)) for a given \(d/\delta\). In contrast, the run-out for coarser \(d=150\,\upmu {\hbox {m}}\)-particles, is almost invariant respect to \(P^*\) and \(d/\delta\). These results show that autofluidization of fine-grained flows demonstrated by earlier works at ambient pressure also occurs at reduced pressure though being less efficient. Hence, autofluidization is a mechanism, among others, to explain long run-out of geophysical flows in different environments.
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Acknowledgements
This work was supported by the Advanced Mining Technology Center (AMTC) and Departamento de Ingeniería Civil, form Universidad de Chile, the French National Research Institute for Sustainable Development (IRD, France) and the Chilean National Commission for Scientific and Technological Research, CONICYT, through Fondecyt Projects 1130910 and 11130254 and PIA Project AFB180004. We thank P. Mendoza and two anonymous reviewers for helpful comments on our work. We also thank C. González for his assistance with graphics. This is Laboratory of Excellence ClerVolc Contribution No. 481.
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Montserrat, S., Ordoñez, L., Tamburrino, A. et al. Influence of bottom roughness and ambient pressure conditions on the emplacement of experimental dam-break granular flows. Granular Matter 23, 57 (2021). https://doi.org/10.1007/s10035-021-01125-2
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DOI: https://doi.org/10.1007/s10035-021-01125-2