Grain bulk density

Maximum value of bulk density for granulated sugar occurs at grain size 0.2 mm, and is 930 kg/m (no conglomerates). ... 

In the United States, a number of physical tests are performed on siUcon carbide using standard AGA-approved methods, including particle size (sieve) analysis, bulk density, capillarity (wettabiUty), friabiUty, and sedimentation. Specifications for particle size depend on the use for example, coated abrasive requirements (134) are different from the requirements for general industrial abrasives. In Europe and Japan, requirements are again set by ISO and JSA, respectively. Standards for industrial grain are approximately the same as in the United States, but sizing standards are different for both coated abrasives and powders. 

A petroleum coke with round grains is available specifically for borehole cathodic protection applications The round grains ensure high porosity and enable gas to escape, allowing the coke to sink to the base of the borehole. This material hjis a higher bulk density than petroleum coke (1 185 kgm" ) which enables it to sink to the bottom of the borehole, yet a lower fixed carbon content (93%), with higher ash (2-06%) and sulphur (5-3%) contents. The resistivity of this material is quoted as 0-1 ohmm. 

A suitable approach to the equilibration of an amorphous polymer system at bulk density becomes much more likely when the fully atomistic model in continuous space is replaced by an equivalent coarse-grained model on a lattice with sufficient conformational flexibility. Different strategies, which seek results at different levels of detail, can be employed to create an appropriate coarse-grained model. Section 4 (Doruker, Mattice) describes an approach which attempts to retain a connection with the covalent bonds in the polymer. The rotational isomeric state (RIS) [35,36] model for the chain is mapped into... 

Fig. 4.6. Distribution of grain size as a function of bulk density of freeze dried coffee extract, which has been gassed with different pressures of C02 before freezing.

The plastic flow of sulfur is thought to be responsible for the increase in the burning time that is experienced with black powders of various pellet sizes as the pellets (or grains) are compressed to higher bulk densities. 

Another distinctive characteristic of the PLZT materials is their fully dense, pore-free microstructure which is devoid of any second phases. This is reflected in measured bulk densities which routinely exceed 99.9% of theoretical density. The existence of pores or second phases in the volume of the grains or in the grain boundaries is undesirable since both act to increase light scattering and reduce optical transparency. 

Engineering calculations often need the rate of heterogeneous catalytic reaction to be referred not to the surface, but to the mass of the catalyst or the volume of the bed of the catalyst grains. The relation between different expressions of a heterogeneous catalytic reaction rate is determined by the values of specific surface area, a, of the catalyst and the bulk density, pb, of the catalyst bed. The total surface of the catalyst, s = am, where m is the mass of the catalyst m = pbv, where v is the volume of the bed. 

Ushakumari et al. (2007) developed a process for the preparation of expanded ragi. After parboiling and decortication, the grains were conditioned to 40% moisture, flattened in a roller flaker, and then toasted in salt maintained at 220-225 °C for 6 s. Shape factor (ratio of measurements on two peripendicular axes), the expansion ratio (ratio of the volume of expanded millet to that of the decorticated millet of equal weight), apparent bulk density (volume of known weight of expanded millet), and sensory characteristics were the criteria used. The optimum conditions to prepare a product with the highest expansion ratio was then determined. 

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