Density segregation

Transportation (by belt, rail, or truck) can initiate (due to movement of the coal) processes that result in size and density segregation. Thus, variations from one side of a conveyor belt to the other, from side-to-side, end-to-end, and top-to-bottom locations in individual cars or trucks, and between one location and another in a coal pile, must be anticipated (ASTM D-346 ASTM D-2234 ASTM D-4182 ASTM D-4702 ASTM D-4915 ASTM D-4916 ASTM D-6315 ASTM D-6518 ASTM D-6543 ISO 1988). Therefore, the challenge in sampling coal from a source or shipment is to collect a relatively small portion of the coal that accurately represents the composition of the coal. This requires that sample increments be collected such that no piece, regardless of position (or size) relative to the sampling position and implement, is collected or rejected selectively. Thus, the coal sample must be representative of the composition of the whole coal (i.e., coal in a pile or coal in a railcar or truck) as represented by the properties or quality of the sample. 

CFX software focuses on one approach to solve the governing equations of motion (coupled algebraic multigrid), while the FLUENT product offers several solution approaches (density-segregated- and coupled-pressure-based methods). 

Segregation. Partial re-separation of a previously mixed batch of material into its constituents this can occur either as a result of differences in particle size or in density. Segregation is liable to occur in storage bins, on conveyors and in feeders during the dry or semi-dry processing of ceramic materials. 

K. Shinohara, Mechanism of Density Segregation of Particles in Filling Vessels, Ind. Chem. Process Design and Development, Vol. 23, No. 3,1984... 

Two-Dimensional Dense Gas-Binary Particle System Simulation Particle Density Segregation in BFB System... 

The Multi-fluid model for Cold Flow Particle Density Segregation... 

Fig. 4.14 Axitd distribution of llotsam-to-total particle volume fraction ratios due to bintiry particle density segregation. Reprinted from Chao et al. [23] with permission from Elsevier...

Chao Z, Wang Y, Jakobsen JP, Femandino M, Jakobsen HA (2012) Investigation of particle-particle drag in a dense binary fluidized bed. Powder Technol 224 311-322 Chao Z, Wang Y, Jakobsen JP, Femandino M, Jakobsen HA (2012) Multifluid modeling of density segregation in a dense binary fluidized bed. Particuology 10 62-71... 

FIELD COTAMINATION OF SORGHUM WITH ZERALENONE AND DEOXYNIVALENOL IN NORTH CAROLINA DENSITY SEGREGATION TO REMOVE MYCOTOXINS... 

Our objective in this research was to test density segregation as a means of separating ZE-, DON-, and AF-contaminated kernels of... 

Table 1. Density Segregation of Mycotoxins in Newly Harvested Pamlico County Sorghum. 

Huff, W.E. and Hagler, W.M., Jr. (1982). Evaluation of density segregation as a means to estimate the degree of aflatoxin contamination of corn. Cereal Chem., 59, 152-153. 

Huff, W.E., and Hagler, W.M. (1985). Density segregation of corn and wheat naturally contaminated with aflatoxin, deoxynivalenol and zearalenone. J. Food Prot., 48, 416-420. 

Jain, N., Ottino, J., and Lueptow, R. (2005b). Combined size and density segregation and mixing in noncircular tumblers. Phys. Rev. E, 71, 051301/1-10. 

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