Ecological Systems and Devices Annotation << Back Analysis of Filtration Flow Velocity Fields in Modeling and Calculation of Environmental Mass-Exchange Equipment for Treatment of Gas Emissions and Liquid Discharges from Industrial Enterprises. Part 1. Velocity Fields Merentsov N.A., Golovanchikov A.B., Topilin M.V., Persidskiy A.V., Anokhin D.A. The necessity of analysis of local velocities and recognition of local hydrodynamics in working volumes of ecological mass-exchange systems is considered. The basic methods of recognition and registration of values of local velocities of carrier streams in cross-sections of ecological mass-exchange apparatuses, as well as advantages and disadvantages of these methods are given. The methods developed by the authors and corresponding formulas for calculating the dispersion of local velocities of the carrier fl ow both for measurement planes passing through the longitudinal axis of the mass-exchange sorption apparatus (radial, diametrical and concentric circumferential values) and for spatial fi elds of filtration fl ow velocities are presented. Examples of experimental data of filtration fl ow velocity fi elds of gas fl ow through layers of adsorbents zeolite NaA with equivalent diameters of granules d = 1.6–2.5 mm and active aluminum oxide (Q1) d = 3–5 mm with further data processing and obtaining model parameters necessary for improving mathematical modeling of massexchange ecological systems are presented. An example of construction of differential C-functions of the conditional indicator distribution response from the analysis of radial values of filtration flow of the gas phase fl ow through the layers of the studied adsorbent granules is given. Keywords: modeling of mass-exchange systems, mass transfer, environmental equipment, sorption, adsorption, sorbent granules, hydrodynamics, gas dynamics, filtration, filtration flows, flow structure, Peclet criterion, velocity profile, velocity fields. DOI: 10.25791/esip.3.2025.1510 Pp. 33-48.