ABSTRACT
I. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 II. Types of Mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 III. The Bulk Density and Compressibility of Binary Mixtures . . . . . . . . . . . . . . . . . . . . . . . 29 IV. Mixing and Segregation Indices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
A. Mixing Indices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 B. Segregation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 C. Segregation Indices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
V. Attrition and Segregation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 VI. Moisture Migration Between Particles of Different Species . . . . . . . . . . . . . . . . . . . . . . 34 VII. Particles Migration in Interactive (“Ordered”) Mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . 35 VIII. Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
I. INTRODUCTION
A mixture, according to most dictionaries, is the result of combining or putting together two or more components or ingredients. According to this definition, granular foods like rice, lentils, and cornflakes, or food powders like wheat flour, instant milk, or coffee are all mixtures since they contain a variety of compounds belonging to different chemical species. For the following discussion, however, let us define a food particulate mixture as an assembly of particles distinguished by size, shape, over all composition, and any other physical or chemical property. Hence, the smallest elements of the mixture will be the individual particles, irrespective of their nonhomogeneity and size, rather than their chemical, physical, and microstructural components. It will also be assumed that the chemical components,
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unless otherwise stated, are in thermal and chemical “practical equilibrium,” that is, they do not react or exchange moisture on the pertinent timescale.
