@article{fdi:010066700,
  title = {{E}nhanced run-out of dam-break granular flows caused by initial fluidization and initial material expansion},
  author = {{M}ontserrat, {S}. and {T}amburrino, {A}. and {R}oche, {O}livier and {N}ino, {Y}. and {I}hle, {C}. {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e report results of the run-out of experimental dam-break flows in a horizontal channel generated from the collapse of columns of fine (75 mu m) particles fluidized at various degrees. {W}e find that the flow run-out (x) made dimensionless by the initial column length (x(o)) is a power function of the initial column height-to-length ratio (r), as shown in previous works with non-fluidized flows. {T}he run-out of flows initially fluidized at different degrees is accounted by x/x(o) = alpha r(n). {F}or initially non-fluidized flows, our values of a are significantly higher than those reported earlier for flows of coarser granular material (>0.15 mm), showing that finely grained flows have longer run-outs compared to their coarser counterparts. {T}he coefficient a is a function of the initial degree of fluidization, with a higher growth above 93 % of fluidization, which coincides with the onset of bed expansion, and it accounts for a flow run-out increase being up to more than twice that of non-fluidized flows. {T}he parameter a is well correlated with the amount of initial bed expansion, which undergoes a sharp transition at high degrees of fluidization that has shown to be an important mechanism for reducing flow friction. {O}ur results are consistent with earlier findings that showed that bed expansion significantly increases pore pressure diffusion timescales in static columns, suggesting that the long run-out of initially expanded finely grained flows is due to their ability to diffuse pore pressure slowly.},
  keywords = {{G}ranular flow ; {R}un-out ; {F}luidization ; {P}ore pressure ; {D}am-break ; {E}xperiments},
  booktitle = {},
  journal = {{G}ranular {M}atter},
  volume = {18},
  numero = {1},
  pages = {11},
  ISSN = {1434-5021},
  year = {2016},
  DOI = {10.1007/s10035-016-0604-6},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066700},
}