Characteristic diameter

The AC-3 common industrial radionuclide tomograph have following technical characteristics diameter of tested articles from 5 to 250 mm, time of information registering -5-25 min, spatial resolution - 1%/... 

In this definition, ps and pt are the solid and fluid densities, respectively. The characteristic diameter of the particles is ds (which is used in calculating the projected cross-sectional area of particle in the direction of the flow in the drag law). The kinematic viscosity of the fluid is vf and y is a characteristic strain rate for the flow. In a turbulent flow, y can be approximated by l/r when ds is smaller than the Kolmogorov length scale r. (Unless the turbulence is extremely intense, this will usually be the case for fine particles.) Based on the Stokes... 

A).632 Characteristic diameter 63.2% of total volume of droplets are of smaller diameters than this value V=63.2% X (X in Rosin-Rammler distribution function)... 

Re p Particle Reynolds number with dp as characteristic diameter — —... 

It Is Important to use highly accurate surface area values of a crystal particle In growth rate equations, when the equations Include a term of the surface area. In practice, however. It Is difficult to measure the surface area unless the crystal possesses a simple geometry (e.g., sphere, cube, octahedron, etc.), or unless the B.E.T. method of measuring surface area Is applied. Therefore, a characteristic diameter Is usually defined, and the area calculated from the diameter Is used. 

Assuming a quasiuniform energy input in the mill chamber, its characteristic diameter d will be irrelevant. Then the pi set is reduced to... 

Evaluate the molecular weight of the Ludox particles, using a value of H = 4.08 x 10 7 for the system. Calculate the characteristic diameter for these particles, assuming the particles to be uniform spheres of density 2.2 g cm-3. 

When a particle is not spherical, its characteristic diameter is taken as that of a sphere with the same volume, so that... 

Crushing is applied to large lumps of feed stock and grinding to smaller lumps, often the products of crushing, but the size distinction is not overly sharp. The process of size reduction results in a range of product sizes whose proper description is with the complete cumulative size distribution, but for convenience a characteristic diameter corresponding to 80% pass in the cumulative distribution curve is commonly quoted. 

Particle deposition velocities depend on a number of factors, including wind speed, atmospheric stability, relative humidity, particle characteristics (diameter, shape, and density), and receptor surface characteristics. Recent studies on dry particle deposition to surrogate surfaces and derived from atmospheric particle size distributions and micrometeorology suggest that a V equal to about 0.5 cm s 1 is applicable to urban/industrial regions [116-120]. 

Let us consider the limiting case, namely the absence of collisions, assuming that icoi = 0 in (3.40), in other words that the mean free path considerably exceeds the characteristic diameter of the beam. 

SUPPRESSED FIREBALL CHARACTERISTICS DIAMETER BURNING TIME RADIANT FLUX... 

Figure 53 Main types of the crystalline structure of the carbon nanofilaments produced by pyrolysis of hydrocarbons over transition metal nanoparticles coaxial cylindrical (multilayer nanotube) (A), coaxial conical (fishbone) (B), and pile (C). The nanofilaments are 10 nm in characteristic diameter. The catalyst nanoparticle behaves as a nanofilament seed.

Malvern Insitec) EPCS-F is designed for powders in the size range of 0.2 pm to 1000 pm [202]. Partiele measurements are made at rates up to 500 per second with immediate display of particle size distribution and characteristic diameters. Specific values or points on the particle size distribution are continuously fed back to the user or to a process control system. Particles with different refractive indices and aspect ratios up to 2 1 can be measured. 

Hydrocyclones, also called hydroclones, employ self-generated mild centrifugal forces to separate the particles into groups of predominantly small and predominantly large ones. Because of bypassing, the split of sizes is not sharp. The characteristic diameter of the product is taken as rfso, the diameter than which 50 wt % of the material is greater or less. The key elements of a hydrocyclone are identified on Figure 12.3(h). A typical commercial unit has an inlet area about 1% of the cross-sectional area between the vessel wall and the vortex finder, a vortex finder with diameter 35 40% that of the vessel, and an apex diameter not less than 25% that of the vortex finder. For such a unit, the equation for the cut point is... 

Here V% is the cumulative volume percent of particles below diameter a, file is a characteristic diameter related to the maximum of the distribution function, and fii a, is the largest drop diameter in the dispersion. Figure 6 illustrates experimental results described by a Schwarz-Bezemer distribution. Gal-Or and Hoelscher (G2) gave the following relation for drop size distribution ... 

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