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The aerodynamic mode of aspiration and pneumatic transport systems depends on various factors, primarily on the physical characteristics of the transported solid particles, as well as on the characteristics of technological processes with the release of solid particles of various origins and the design of the systems under consideration. When designing aspiration and pneumatic transport systems for various industries, a set of tasks related to ensuring maximum permissible dust concentrations in industrial premises and in atmospheric air, resource conservation and energy efficiency is usually solved. Enterprises producing building materials are characterized by significant dust emissions. At the same time, solid particles are formed in the processes of crushing, grinding, sorting, and moving raw materials and building materials, which generally have a wide range of sizes – from 0.01 microns to 20mm or more. This creates significant difficulties in the design of hazard receivers, air ducts, and air purification devices. In the practice of design, calculations of aspiration and pneumatic transport systems are carried out according to engineering methods based mainly on the data of experimental studies of 1970-1990, in connection with which there is a significant difference in the results. Almost all engineering methods are based on experimental values of the floating velocity of solid particles. The values of the floating velocity of solid particles identical in physical characteristics differ by more than 30%. As for one of the most important aerodynamic characteristics, the transport velocity, new data for various types of particulate matter are needed to improve the methods of engineering calculations. Given the presence of particulate matter of various sizes in the aerodispersed flows of the systems under consideration, the use of numerical modeling is quite limited. There are results of numerical experiments, mainly for air purification equipment, in particular, cyclones. The paper presents experimental data for determining the transport velocity for solid particles typical for enterprises of the construction industry.
Ulyasheva et al. (Fri,) studied this question.