Hydrodynamic behaviour of Cellets™ (Ph.Eur./USP) in a spouted bed using image processing method

The hydrodynamic behaviour of the spouted bed in the pharmaceutical industries has been found to be less addressed. The present paper has focused on the hydrodynamic characteristics of a spouted bed where the Cellets™ (Ph.Eur./USP) is adopted as the bed material. Experiments are carried out with three different static bed heights (H₀) of shallow depth (2D_i ≤ H₀ < 3D_i) using two different particle sizes. The spouted bed employed with D_i/D₀ of 5 has given the experimental information on external spouting (U_es) by mapping the pressure drop, and fountain height (H_f) against the superficial gas velocity (U_g) is represented with the image contours, which show the intrinsic behaviour.

Highlights

• At H₀/d_p = 200, the ΔP and H_f increase and then abruptly decline, further increased with rising U_g.

• Symmetric and asymmetric spouting occurs with d_p of 1000 μm and 700 μm.

• The position of the jet is oscillating like a pendulum for 1000 μm particles.

• Clusters in the freeboard region may be the reason to limit the fountain height.

All the 1000 μm and 700 μm particles have been found to exhibit symmetric and asymmetric spouting. With increasing U_g, the fully suspended particles are limited to a certain height in the freeboard region due to the gas-solid cross-flow, which implies the clusters have identified with the image processing method.

Read more

Jagadeeswari Vanamu, Abanti Sahoo,
Hydrodynamic behaviour of Cellets™ (Ph.Eur./USP) in a spouted bed using image processing method,
Particuology, 2022, ISSN 1674-2001,
https://doi.org/10.1016/j.partic.2022.07.009.

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