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92. 92 without further proof. 7 does not account for the reversed direction of particle drag force at different levels in a chute (the second inaccuracy found in S. E. Butakov’s model). , particles at the chute inlet may cause additional flow resistance to the air suction). 10 yields a slightly conservative value for induced air volumes. Considering this same phenomenon, N. F. Grashchenkov, V. S. Kharkovskiy, and B. 14) where G is material flow rate, m3/s; ρ is air density, kg/m3; c is a head drag coefficient; d is an equivalent sphere diameter, m; R is an aerodynamic drag of the chute, kg⋅s2/m8; k is a correction factor (k = 0,18 for vertical chutes); ω0, ωk are relative velocities of material particles at the chute inlet and outlet, respectively, m/s; and t is a time period during which particles are in a chute, s.
The transition of constrained motion of bulk material into unconstrained motion is accompanied by a similar phenomenon: jet discontinuity and galloping particle motion (saltation). 1), we can note that by choosing Fr number as the transition criterion it is possible to consider the material flow rate in addition to the chute inclination angle. In other words, the Fr criterion provides a great deal of information on a bulk material stream. 4. As in the case with vertical motion of material , the dependence diagram β1 = ƒ(Fr) is clearly divided into three areas that correspond to three modes of stream motion.
A stream portion at the chute bottom is passive due to a larger, cloud-like particle–particle packing while another portion of the stream (above the “layer”) actively interacts with air, engaging it in motion. Separation of materials by particle size is primarily due to specific suction hood design requirements and to a difference in stream structure based on particle size. 5 mm in size, with a maximum particle size not exceeding 1–2 mm. For granular materials, more than 50% of contained particles are less than 3 mm in size, with a maximum size not exceeding 10 mm.
Choosing a heating system by Energy Efficiency Victoria