The influence of grain size and channelization on mobility of volcanic granular flows: insights from laboratory experiments. - Roberto, Sulpizio; Sara, Meschiari; Damiano, Sarocchi; Francesco, Neglia; Angel, Rodriguez-Sedano Luis; Federico, Lucchi; Oscar, Segura-Cisneros; Fabio, Dioguardi; Bernardino, Barrientos (Bulletin of Volcanology, 2025)