The paper (publication) presents a description of the developed design of a rotary mill with a complex mechanical and acoustic effect on the dispersed material, as well as analytical studies of the parameters of energy consumption of a rotary mill, based on the main physical processes occurring in it. The research was carried out by mathematical and simulation modeling of technological processes in the grinding chamber of the mill, as well as on various technological paths of the unit. To determine the main parameters that make up the total power consumption of the unit, an approach was chosen to differentiate the processes by their physical nature and contribution to the formation of the total power consumption of the rotary mill. The obtained results of mathematical modeling of processes occurring inside the technological paths of the unit allowed getting expressions for determining the main power costs of the unit depending on the characteristics of the unit design for each component of the total power required for effective operation of the unit at the required parameters of the dispersion of the finished product.
The desire to create new, improved working fluids for heat and mass transfer systems in the industry is gaining momentum. Now more and more researchers are being attracted to analyze the use of nanofluids in heating systems due to their improved thermal and physical properties. Nanofluids are a new type of dispersed fluids that consist of a carrier fluid in the form of which water can act, as well as polymer solutions and organic liquids, and solid particles, which are mainly particles of chemically stable metals and their oxides. The heat transfer characteristics of modern liquids are significantly improved by the addition of nanoscale solid particles with a diameter of less than 100 nm. Such liquids can be considered as promising applications in such areas as solar collectors, heat pipes, nuclear reactors, electronic cooling systems, automobile radiators, etc. The paper (publication) describes nanofluids as new energy-efficient types of working fluids for heat transfer. The most promising developments in the field of creating nanofluids from the point of view of increasing the heat transfer coefficient are presented and analyzed. Further possible promising ways of studying nanofluids are formulated.
The article considers the solution of the urgent problem of the development of 3D additive technologies in Russia by creating a new model of the forming device and the development of composite materials. The purpose of this work is to study the physical, technological and thermal properties of coarse-pored expanded clay concrete. The required characteristics are determined by standard methods and requirements of regulatory documents, including modern physico-chemical methods of analysis and a wide range of modern and original research methods corresponding to modern scientific knowledge. Results. Compositions of coarse-porous expanded clay concrete with compressive strength up to 9.2 MPa, water absorption up to 25% by weight and shrinkage deformations in the range of 0.1...0.3 mm/m were obtained. To simulate the behavior of the studied systems, a two-factor three-level experiment was conducted for each type of mixture of coarse-pored expanded clay concrete, which allowed us to obtain regression equations characterizing the relationship of variable parameters with certain properties of the system. It was revealed that the value of the average density is most affected by the specific consumption of the binder. While the strength depends most on the I/O ratio. Moreover, in this case, the amount of water is less related to the porosity of the cement stone itself, and more to the consistency and stickiness of the resulting glue, its ability to evenly cover the filler particles. It is established that rationally selected compositions of structural and thermal insulation KPKB for the internal filling of a three-layer "printed" wall, homologation and thermal insulation will ensure the formation of the required technical and operational indicators.
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