Texture and fractal methods for analyzing the characteristics of unsteady gas flows in pipelines

Turbulent structures in two-dimensional model gas flows are analyzed by estimating the fractal dimension and the texture characteristics of the gas flows. The fractal dimension is estimated using the self-similarity indices of the power spectra for the following characteristics of the gas flows: the Coriolis and Boussinesq coefficients, average pressure, hydraulic resistance coefficient, velocity loss in a pipeline element, and curvature of the gas flow. The texture characteristics are calculated using the following texture indices: energy, entropy, inertia coefficient, uniformity coefficient, cluster excess coefficient, cluster asymmetry coefficient, and also information measure of cluster correlation. Computer experiments show that, in propagation of a shock wave, the wavelet spectra of the indices of the model gas flows contain a large number of self-similar figures, which is indicative of a hierarchical structure and a fractal character of the model gas flows.     

Ways to Increase the Energy Efficiency and Reliability of Asynchronous Electric Motors in Chemical Plants

Theoretical Foundations of Chemical Engineering - Efficiently operating the fleet of asynchronous electric motors (AEMs) in chemical plants is a large-scale sectorwide challenge for the...     

Formation of Dust Particles in Process Multiphase Reactors

Theoretical Foundations of Chemical Engineering - Issues of the formation of dust particles in high-temperature technological reactors are considered with an emphasis on the processes occurring in...     

Methodology for Calculating Regulatory Indicators of the Reliability of Elements of Restored Gas Analytical Systems for Monitoring Chemical Environmental Pollution According to Experimental Reference Data

Theoretical Foundations of Chemical Engineering - A method has been developed for calculating the standard indicators of the reliability of elements of restored gas analytical systems for...     

Physicochemical Model of Selection of Complex Compounds for Electroless Metal Plating

Theoretical Foundations of Chemical Engineering - A physicochemical model of the choice of a ligand for the electroless deposition of metal–phosphorus alloys is proposed based on determining...     

Analysis of the Thermophysical and Chemical-Technological Properties of Mining and Processing Waste Materials

Theoretical Foundations of Chemical Engineering - Results of a system analysis of volumes and physical, chemical, granulometric, lithological, and thermophysical characteristics of waste materials...     

Automated Decision Support System in the Energy- and Resource-Efficiency Management of a Chemical-Energy Engineering System for Roasting Phosphorite Pellets

Theoretical Foundations of Chemical Engineering - Mathematical and computer-based models of a complex chemical-engineering roasting process as an interdependent plurality of three...     

Analyzing the Efficiency of Using Different Chemical Compositions for Intensifying the Phytoextraction Processes of Mercury and Other Heavy Metals Based on Multivariate Image Tools

Theoretical Foundations of Chemical Engineering - A method is proposed and multifactorial experiments are carried out to determine the effectiveness of various compositions of chemical additives...     

A Potential-Integral-Index Algorithm for Analyzing the Pressure Fluctuations of Gas Flows in Complex Pipelines

Theoretical Foundations of Chemical Engineering - A potential-integral-index algorithm for analyzing the pressure fluctuations of gas flows in complex pipelines is proposed. Pressure fluctuations...