Particles mean diameters

A conveniendy expressed coordinate for plotting filtration performance is the drainage number, jwhere d is the mean particle diameter in... 

As an example, consider heavy fuel oil (CH15, specific gravity, 0.95) atomized to a surface mean particle diameter of d, burned with 20 percent excess air to produce coke-residue particles having the original drop diameter and suspended in combustion products at 1204°C (2200°F). The flame emissivity due to the particles along a path of L m will be, with d in micrometers. 

In order to be consistent with normal usage, the particle-size distribution when this parameter is used should Be a straight line between approximately 10 percent cumulative weight and 90 percent cumulative weight. By giving the coefficient of variation ana the mean particle diameter, a description of the particle-size distribution is obtained which is normally satisfactory for most industrial purposes. If the product is removed from a mixed-suspension ciystallizer, this coeffi-... 

The plot in Fig. 13 shows the bleed emissions that were measured after a 24 hour soak. Two eanisters were tested, one loaded with a wood granular carbon with a mean particle diameter of 1.27 mm, the second with a wood pellet carbon with a mean particle diameter of 2.10 mm. Both carbon samples had equal BWC of 11.4 g/lOOml. Although both earbons had the same BWC, the larger pellet earbon had lower bleed emissions. These diffusion results are expected in light of Pick s Law. 

The authors also investigated the effect of solvent composition on the retention of a series of solutes including a dispersion of silica smoke (mean particle diameter 0.002 pm). The silica smoke was used to simulate a solute of very large molecular size... 

The initial work was carried out using a silica column 25 cm long and 9 mm I.D. packed with Partisil 10 silica (actual mean particle diameter 8.5 pm) thermostatted at... 

This gives us a mean particle diameter, that has the same free-falling velocity as the set of particles of different sizes. Taking a logarithm of Eq. (14.65), we get... 

Mean particle diameter The mean value of the particle size distribution of the test aerosol. 

A precursor in the synthesis of a promising calcium sensitizing agent from E. Merck [33], a chiral thiadiazin-2-one EMD 53986, 3,6-Dihydro-5-[l,2,3,4-tetrahy-dro-6-quinolyl]-6-methyl-2H-l,3,4-thiadiazin-2-one [26]. The study was performed using Celluspher , a CSP prepared from cellulose tri(p-methylbenzoate) according to a patent from Ciba-Geigy [34]. The spherical particles had a mean particle diameter of 20 3 pm and the mobile phase was pure methanol. 

Filler Mean particle diameter, m Filler concentration, p.b.v. Degree of crystallinity %... 

For water applications, activated carbon is usually of 8 to 40 mesh (a mean particle diameter of 0.55-1.7 mm). 

References to a number of other kinetic studies of the decomposition of Ni(HC02)2 have been given [375]. Erofe evet al. [1026] observed that doping altered the rate of reaction of this solid and, from conductivity data, concluded that the initial step involves electron transfer (HCOO- - HCOO +e-). Fox et al. [118], using particles of homogeneous size, showed that both the reaction rate and the shape of a time curves were sensitive to the mean particle diameter. However, since the reported measurements refer to reactions at different temperatures, it is at least possible that some part of the effects described could be temperature effects. Decomposition of nickel formate in oxygen [60] yielded NiO and C02 only the shapes of the a—time curves were comparable in some respects with those for reaction in vacuum and E = 160 15 kJ mole-1. Criado et al. [1031] used the Prout—Tompkins equation [eqn. (9)] in a non-isothermal kinetic analysis of nickel formate decomposition and obtained E = 100 4 kJ mole-1. 

Sand with a mean particle diameter of 0.2 mm is to be conveyed in water flowing at 0.5 kg/s in a 25 mm internal diameter horizontal pipe 100 m long. Assuming fully suspended flow, what is the maximum amount of sand which may be transported in this way if the head developed by the pump is limited to 300 kN/m2 ... 

During ball milling the mean particle diameter, d, gas adsorption isotherm specific surface area (BET) and contamination (wt% contaminant) conform to the general law ... 

The TEM images of the starch-capped ZnSe nanoparticles showed that the particles were well dispersed, small and spherical in shape. The particles are in the range 2.3 to 4.2 nm with mean particle diameter of 3.3 nm and standard deviation (o) of 0.562 nm indicating broad size distribution. The TEM diameter is in accordance with the XRD result. The broad size distribution was attributed to the aggregation of the smaller particles which are thermodynamically unstable in the solution as a result of their high surface energy which makes them very reactive (Wei et al., 2004 Lee at al., 2002, 2003). 

CMP of HDD substrate in four kinds of slurries, each with a different mean particle diameter of 15,30,50, and 160 nm as shown in Fig. 33, was conducted by Lei and Luo [43]. The dependences of Wa, Ra, and material removal rate on the Si02 particle size are shown in Figs. 34(a)-34(c), respec-... 

Determined by inductively coupled plasma-mass spectrometry of acid digested catalyst samples Calculated from X-ray diffraction peak broadening at (101) foranatase and (110) formtile TiOa Mean particle diameter measured from transmission electron microscopy pictures of gold catalysts... 

Figure 33. Catalytic activity for the oxidation of hydroxy benzyl alcohol with O2 as a function of mean particle diameter of Pd and Au [102].

From the TEM micrographs, particle sizes and the number of particles per unit area could be estimated. Figure 16.6 provides a quantitative analysis of the particle sizes as a function of deposition time. It is evident from the particle size distributions that at low nominal Au thickness (0.13 nm), mean particle diameters are about 1.4 nm and fall in a narrow range of sizes. As the nominal thickness becomes higher, the particle... 

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