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• W2017403223 abstract "The eruptive columns of explosive volcanism are fed by a gas–particle conduit flow, which characteristics determine the eruptive regime and are important for assessing the hazard of active volcanoes. In this paper, by means of the combined use of large-scale experiments and numerical modeling, a study on some parameters of the gas–particle conduit flow of explosive eruptions is carried out. A 1D two-phase non-homogeneous Eulerian–Eulerian model has been developed for checking the influence of some crucial quantities: interphase drag, particle–wall friction and particle shape factor. Hundreds of different parameters combinations are tested and used for the simulation of controlled experimental runs. The parameter combination that best fits the whole set of experiments, including both column collapses and convective plumes, results into an average error of about 10%. A further analysis has been carried out to determine the sensitivity of solutions to model parameters. The choice of the interphase drag does not influence dramatically the solution, except for highly concentrated flows. The particle shape factor severely affects gas and particle velocities. The influence of various particle–wall friction laws, which were originally obtained in pneumatic engineering, is thoroughly investigated, as the suitability of these laws has never been proved in volcanology. A detailed parametric analysis allowed the re-calibration of two of these laws, which are now specifically tailored for the case of highly concentrated conduit flows that feed collapsing columns, and dilute flows that feed convective plumes." @default.
• W2017403223 created "2016-06-24" @default.
• W2017403223 creator A5059021306 @default.
• W2017403223 creator A5074119076 @default.
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• W2017403223 date "2013-01-01" @default.
• W2017403223 modified "2023-09-27" @default.
• W2017403223 title "Integration of large-scale experiments and numerical simulations for the calibration of friction laws in volcanic conduit flows" @default.
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• W2017403223 doi "https://doi.org/10.1016/j.jvolgeores.2012.09.011" @default.
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