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A bed of spherical glass beads (density $3000 \text{ kg/m$^3$}$, diameter $1\:\text{mm}$, bed porosity $0.5$) is to be fluidized by a liquid of density $1000 \text{ kg/m$^3$}$ and viscocity $0.1 \text{ Pa.s}$. Assume that the Reynolds number based on particle diameter is very small compared to one. If $g = 10 \text{ m/s$^{2}$}$, then the minimum velocity (in $\text{m/s}$) required to fluidize the bed is

  1. $3.33x10^{-4}$
  2. $3.33x10^{-1}$
  3. $3$
  4. $30$
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