A long-body return flow cyclone with a large value of cyclone characteristic factor √A_i/D₀ has a tendency to increase both the pressure loss and the collection efficiency in the range of Re_D≅2700-4000 of Reynolds number based on the cyclone diameter.
In a normal cyclone, the downward spiral flow becomes an upward return flow at the end of the conical part of the cyclone, but the long-body cyclone with an asymetrical spiral flow shows an unsteady flow. The outside downward flow changes into an upward flow at the length of h*/D₀≅3.5-4 from the cyclone inlet, and the spiral flow does not reach to the bottom end of the long-body cyclone.

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Novel agglomerated crystallization techniques, i. e., neutralization and solvent change techniques, were devised, in order to design phenytoin (antiepileptic) crystals so as to be directly compounded during their formulation. The proposed techniques could directly transform the fine precipitated crystals into free-flowing spherical agglomerates during crystallization. The agglomeration processes by neutralization and the solvent change methods were described in terms of a random-coalescence model and a mixed model with layering, respectively. The micromeritic properties of the agglomerates, e. g. surface topography, particle density and mechanical strength, depended on the agglomeration mechanism. The consolidation of the agglomerates in the neutralization process was represeted by a function of the agglomeration rate constants.

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Plug motion in a horizontal pipe is computed following the first and second reports.
The pressure of air from an compressor which depends on time, and a bend which partially changes the friction forces, have an important effect upon plug motion. These are some of the factors of randomness of the experimental data.
In this report, the pressure fluctuation and the bend are considered. The plug motion depends on the amplitude, the phase of pressure fluctuation, and the shape of the pressure wave.
When the plug moves through the bend, the friction force which partially increased at the bend, translates into the pressure difference between the front and the rear of the plug.

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