Effect of Particle Size Distribution

Bierwagen, G.P. and Saunders, T.E., 1974. Studies of the effects of particle size distribution on the packing efficiency of particles. Powder Technology, 10, 111-119. 

In their study of the effect of particle-size distribution on mass-transfer in dispersions, Gal-Or and Hoelscher (G5) show that when the variable particle size is replaced by the surface mean radius a32, the error introduced is usually very small (see Section IV, J). Consequently if a in Eq. (144) is replaced by a32, that equation can be compared with the experimental correlations [Eq. (10) and (11)] proposed by Calderbank and Moo-Young (C4) for mass transfer in dispersions (see Fig. 9). 

The effect of particle-size distribution on the mass-transfer coefficient is... 

Guillong M, Gunther D (2002) Effect of particle size distribution on ICP-induced elemental fractionation in laser ablation-inductively coupled plasma-mass spectrometry. J Anal At Spectrom 7 831-837 Gunther D (2002) Laser-ablation inductively coupled plasma mass spectrometry. Anal Bioanal Chem 372 31-32... 

JR Crison, GL Amidon. The effect of particle size distribution on drug dissolution A mathematical model for predicting dissolution and absorption of suspensions in the small intestine. Pharm Res 10 S170, 1992. 

RJ Hintz, KC Johnson. The effect of particle size distribution on the dissolution rate and oral absorption. Int J Pharm 51 9-17, 1989. 

Kristensen, H. G., Holm, P., and Schaefer, T., Mechanical Properties of Moist Agglomerates in Relation to Granulation Mechanisms. Part II Effect of Particle Size Distribution, Powder Technology, 44 239-247 (1985)... 

Gage JC Toxicity of paraquat and diquat aerosols generated by a size-selective cyclone Effect of particle size distribution. Br J Ind Mei 25 304-314, 1968... 

S. Kleinberg F.P. Stein, Effect of Particle-Size Distribution on the Thermal Decomposition of a-Lead Azide , JPhysChem 77, No 7, 870— 875 (1973) 13) Director, Explosives Re-... 

Kristensen HG, Holm P, Schaefer T. Mechanical properties of moist agglomerates in relation to granulation mechanisms Part II. Effects of particle size distribution. Powder Technol 1985 44 239-247. 

Aksel, C. and Riley, F.L., Effect of particle size distribution of spinel on the mechanical properties and thermal shock performance of MgO-spinel composites , J. Eur. Ceram. Soc., 2003 23(16) 3079-87. 

Yang, Z., "Effect of Particle Size Distribution on Fluidization Quality, M. S. Thesis, Inst. Chem. Metall. (1982). 

By definition, the kinetic curve of a cement is the weighted sum of the curves for its constituent phases as they occur in that cement. The reactivities of individual clinker phases were considered in Section 4.5 and some effects of particle size distribution, which is a particularly important variable, in Section 4.1.4. Although many data relating particle size distribution directly to strength exist, much less is known about its relation to degrees of reaction. Parrott and Killoh (P30) presented data indicating that the rate of hydration, as represented by that of heat evolution, was proportional to the specific surface area during the period of hydration in which the rate was controlled by diffusion. 

The description of phase 1 of the SE theory was refined by Gardon [133] and Harada et al. [134] the effect of particles in which polymerization has been terminated by radical entrance is included. Paris et al. [135] and Sautin et al. [136] calculate the balance of micelles and of the growing and dead particles. Pismen and Kuchanov [137] and Sundberg and Eliassen [138] included the effect of particle size distribution in their calculations. According to Fitch and Tsai [134] and Roe [140], the monomer swollen particles are produced by the polymerization of the monomer which is dissolved in water. 

Equation (5.41) assumes that the gas is of a uniform composition throughout the reactor at all times. If the gas composition changes with the time or position within the reactor, a different equation must be used. To account for the effect of particle size distribution in addition to the residence time distribution is difficult because different size particles can remain in the reactor for different periods of time. To account for these effects completely a population balance must be performed, where the conversion is an internal variable (see Chapter 3). This type of treatment is beyond the scope of this chapter. A simplified method of accounting for the effects of a particle size distribution, mQt), on the mean conversion, is by... 

TABLE 12.3 Effect of Particle Size Distribution on the Maximum Packing Density"... 

Effect of particle size distribution unknown appreciable negligible can cause segregation... 

The effect of particle size distribution on the viscosities of suspensions and emulsions has been investigated (28, 32-35). Most of these studies indicate that the effect of particle size distribution is of enormous magnitude... 

Figure 12 shows Chong et al. (28) data for monodisperse and bidisperse (bimodal) suspension systems. In a bidisperse suspension, the volume fraction of small spheres (diameter d) in the mixture is kept constant at 25% of the total solids. The figure shows that the viscosity of a bidisperse suspension is a strong function of the particle size ratio, d/D, where D is the diameter of the large particles. The viscosity decreases substantially by decreasing d/D at a given total solids concentration. The data for the unimodal system fall well above the bimodal suspensions. Also, the effect of particle size distribution decreases at lower values of total solids concentration. 

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