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Q1) 1.28 gm of a powder of a particle density 2500 kg/m³ are charged into the cell of an apparatus for measurements of particle size and specific surface area by permeametry. The cylindrical cell has a dimeter of 1.14 cm and the powder forms a bed depth of (1 cm). Dry air of density 1.2 kg/m³ and viscosity of 18 * 10⁻⁶ Pa. s flows at a rate of 36 cm³/min through the powder (in a direction parallel to the axis of the cylindrical cell) and producing a pressure difference of 981 Pa across the bed. The system steady state and the particles are spherical in shape. Find the following: A) The surface-mean diameter (effective diameter Dₚ). B) Specific surface of the powder (m²/kg) C) The Reynolds number (N_{Re,p}) NOTE: use the following equation in the solution: Δp = (150μv' ΔL (1 – ε)²)/ (Dₚ² ε³)

          Q1) 1.28 gm of a powder of a particle density 2500 kg/m³ are charged into the cell of an apparatus
for measurements of particle size and specific surface area by permeametry. The cylindrical cell
has a dimeter of 1.14 cm and the powder forms a bed depth of (1 cm). Dry air of density 1.2 kg/m³
and viscosity of 18 * 10⁻⁶ Pa. s flows at a rate of 36 cm³/min through the powder (in a direction
parallel to the axis of the cylindrical cell) and producing a pressure difference of 981 Pa across the
bed. The system steady state and the particles are spherical in shape. Find the following:

A) The surface-mean diameter (effective diameter Dₚ).
B) Specific surface of the powder (m²/kg)
C) The Reynolds number (N_{Re,p})
NOTE: use the following equation in the solution:

Δp = (150μv' ΔL (1 – ε)²)/ (Dₚ² ε³)

q1 128 gm of a powder of a particle density 2500 kgm3 are charged into the cell of an apparatus for measurements of particle size and specific surface area by permeametry the cylindrical cel 44206

Added by Diane R.

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