Question

1. The size of suspended particles ranges from
a) 10 -3 to 10 -5 cm b) 10 -3 to 10 -8 cm c) 10 -2 to 10 -4 cm d) 10 -3 to 10 -6 cm

Answer 1

Answer:

<50-100 µm. is the answer

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Answer 2

Answer:

Bands and other patterns are observed in a settling suspension of uniform non-Brownian particles in a completely filled horizontal rotating cylinder. A series of sharp pattern changes have been mapped out as a function of the rotation period and solvent viscosity. This simple system displays an amazing richness of flow structures and patterns. For example, the particles can separate into axially periodic band structures in a finite range of rotation rates. These coherent structures are robust, and the characteristic band length and spatial orientation changes less than ten percent over this rotation range. Nine states have been identified, including two transition states where two flow structures coexist. The collective behavior of the particles and their host medium demonstrates new principles in particulate two-phase flows; therefore, progress in this research can touch many areas of applied sciences and engineering. Quantum-dot particles will allow measurement of particle configurations at higher concentrations. This will also allow systematic analysis of local concentration variations and velocity fields for different flow states.

Phase Diagram as a function of rotation period and solvent viscosity