DIRECTION GÉNÉRALE DU DÉVELOPPEMENT DURABLE
Fluidization is a special case of hindered settling. The total head loss in a fully
fluidized sand bed is approximately equal to the original depth of the bed. This is
coincidental, because the apparent relative density of sand is about 1.65 (that is,
2.65 - 1) and, with a porosity of about 0.4, the volume of the sand grains is about
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