@article{fdi:010093493,
  title = {{U}nifying fluidization and defluidization of granular columns},
  author = {{C}hupin, {L}. and {R}oche, {O}livier and van den {W}ildenberg, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e study air pressure during the fluidization and defluidization of granular columns with the aim to unify the description of these processes. {T}o this end, we perform experiments with different air flow velocities and columns of different heights. {T}he experimental measurements evidence a nonlinear relationship between pressure and the depth in the column. {T}his complex pressure profile challenges the conventional framework of {D}arcy's law, typically used to analyze airflow in granular columns. {W}e introduce a law that effectively captures these nonlinear effects, occurring even at low particle {R}eynolds numbers. {A}n advantage of our approach is its applicability to defluidization-a key phenomenon in gravity-driven gas-particle flows. {U}sing this law, we present a model to describe the decrease of air pressure in a defluidizing column, with numerical simulations aligning well with experimental results.},
  keywords = {},
  booktitle = {},
  journal = {{P}hysical {R}eview {E}},
  volume = {111},
  numero = {4},
  pages = {045421 [7 p.]},
  ISSN = {2470-0045},
  year = {2025},
  DOI = {10.1103/{P}hys{R}ev{E}.111.045421},
  URL = {https://www.documentation.ird.fr/hor/fdi:010093493},
}