Interaction Of Water Droplets Research Articles

Dynamic processes in the liquid crystal-water emulsion under shear flow and electric field

We present the results of experimental investigation of dynamical processes arising in liquid crystal-water emulsion under action of a decay shear flow and ac electric field. The 10 : 1 emulsion, consisting of the well-studied nematic mixture E7 and ionized water was prepared by usage of ultrasonic (29 kHz) mixer. It made possible to get a number of water droplets with the distribution of diameters in the range 2… 20μm. So, the slow decreasing of sizes of these instabilities resulted in corresponding slow motion of the attracted water droplets. The strong electric filled, which stabilized the initial homeotropic orientation of LC suppressed the flow induced instabilities and the slow motion of water droplets mentioned above. It also induced the aggregation of droplets in the vicinity of boundary between regions with strong field and free of field. So, combined action of shear flow and electric field can be effectively used for manipulation of the motion and interaction of water droplets. The obtained results are discussed within the existing theory of liquid crystals.

Investigation of a Thermal Detonation Wave in a Mixture of Water Drops with Molted Lead

The patterns of the wave of thermal interaction of water drops in a high-temperature molten lead, are studied. Due to the boiling of water on the surface of molten lead, both liquids (phases) are separated by a vapor film. A one-dimensional model of interacting and interpenetrating continuums is used, which describes the dynamics of each fluid by introducing a special field characterized by its own velocity, temperature, and volume fraction. Wave velocity is determined by the equality of phase velocities and temperatures in the Chapman-Jouguet plane. The parameters at the pressure peak are calculated from the conditions at the discontinuity which are the boundary conditions for integrating the conservation equations in the zone of interaction of water droplets with the melt. The resulting structure of the thermal detonation wave is characterized by the fact that the maximum pressure is at some distance from the shock wave.

Interaction of water droplets with pyrolyzing coal particles and tablets

The paper presents the experimental research findings for the patterns of collisions of water droplets with pressed tableted samples used as substrates and with small particles of a pyrolyzing solid fuel. Brown coal samples were used. Droplet-substrate interactions were studied when varying the droplet diameter in the range from 1 to 4 mm and velocity from 0.5 to 4 m/s. That corresponded to the Weber number range of 7–830. The coal tablet surface temperature was varied from 20 to 700 °C. In the interactions of water droplets (0.7–1.5 mm in diameter, pre-collision velocity from 1 to 3 m/s) with coal particles (with a size of 0.2–1 mm, pre-collision velocity 0.7–2 m/s), the temperature of the latter was varied in the range of 330–480 °C. The following regimes of the interaction of droplets with solid particles during chemical reactions and phase transformations were distinguished: spreading/agglomeration and break-up/separation. Differences in the characteristics of the interaction of water droplets with coal particles at varying temperatures were identified. Droplet-particle interaction regime maps for B(We), We(Oh) and We(Ca) were constructed. The collision regime boundaries were described using fitted curves that can be utilized to develop the existing mathematical models of droplet-particle collisions in gas. It was established that the gaseous volatile production in coal pyrolysis has a modest effect on the regimes and characteristics of the droplet destruction in the temperature range under consideration (20–700 °C).

Analysis of Water Droplet Interaction with Turbulent Premixed and Spray Flames Using Carrier Phase Direct Numerical Simulations

ABSTRACT Carrier-phase direct numerical simulations (DNS) of n-heptane/air combustion with water droplet injection are reported in this paper. The influence of water droplet injection has been analyzed for statistically planar gaseous premixed flames and spray flames where the fuel is supplied in the form of monodisperse fuel droplets. The effects of water injection in both types of flames are compared, including their sensitivities on the initial diameter of water droplets. The simulations are based on an Eulerian-Lagrangian-Lagrangian approach to consider the multi-phase interaction and the simultaneous effects of n-heptane and water droplets. It is shown that the two types of flames are different in terms of several aspects. In particular, the spray flames are characterized by lower temperatures, and their propagation speed is lower than for premixed flames. The main reason for these differences lies in the gaseous equivalence ratio experienced by the reaction zone. For the cases investigated here, where the overall equivalence ratio is unity, the spray combustion occurs under predominantly fuel-lean conditions. Furthermore, the flame temperature is influenced by the initial diameter of water droplets, which affects the strength of thermal expansion within the flame. This in turn influences the evaporation characteristics of both fuel and water droplets due to different residence times within the flame. Although the effects of water droplets on the combustion mode are dependent on the relative position within the spray flame, the net effect is a partial shift from non-premixed to premixed mode. At the same time, the spray combustion occurs under relatively fuel-richer conditions with water injection and these trends appear consistently in laminar and turbulent flows.

Theoretical study of a flow-through humidifier with a rotary water spray

Purpose. To formulate a mathematical description of the process of air humidification in a flow-through apparatus with a rotary water sprayer (as an automation object). Methods. The analytical method of research is applied, which is based on determining the dynamic characteristics of heat and mass transfer processes during the interaction of water droplets with an airflow. Results. A mathematical description of the dynamics of a flowing air humidifier with a rotary water sprayer is formulated as a mathematical model of the unsteady mode of heat and mass transfer of sprayed water with an air stream and a mathematical model of the movement of a droplet as a material particle in a vertical uneven air flow. The trajectories of the droplets in the air flow are determined and the air humidification graphs are obtained. The obtained solution to the system of equations allows us to determine the influence of design and operating parameters on the dynamic properties of the air humidifier. Conclusions 1. A dynamic mathematical model of heat and mass transfer in a flow-through apparatus of ideal mixing has been developed. 2. The analytical dependences of the change in air parameters in time on the operating and design parameters of the apparatus were obtained. 3. The kinetic parameters of the droplet motion are determined. Keywords: air flow, droplet, humidifier, rotary disk, heat transfer, moisture content.

Charge-Dipole Attraction as a Surface Interaction between Water Droplets Immersed in Organic Phases.

The dynamic behavior of emulsion droplets during their interactions with one another or with solid surfaces plays a paramount role in their ultimate stability in various applications. While the interaction of oil droplets through a surrounding aqueous phase is well understood, recent studies on the interaction of water droplets through a surrounding pure organic phase showed the presence of an unexplained attraction between water droplets at relatively long ranges. In this research study, we propose fixed-surface-charge-bulk-dipole attraction as a new interaction force between water-in-oil droplets and then derive an equation for its disjoining pressure. The behavior of water droplets in the presence and absence of this charge-dipole interaction was numerically quantified using the Stokes-Reynolds-Young-Laplace model and compared to the experimental data. Numerically calculated net force curves are in excellent agreement with experimental data from the literature when charge-dipole attraction is included, while they deviate in its absence. In addition, the water droplet and thin oil film profiles in the presence and absence of charge-dipole attraction were calculated and compared. This research indicates that charge-dipole attraction can adequately explain the mysterious force observed in some studies, which demonstrates its unexplored potential to capture the physical properties and dynamic behavior of water droplets in organic phases with useful implications to unravel unidentified interactions between emulsion droplets in different industries.

Effects of water droplet injection on turbulent premixed flame propagation: a direct numerical simulation investigation

The influence of water droplet injection on the propagation rate of statistically planar stoichiometric n-heptane-air flames has been analysed based on three-dimensional carrier phase Direct Numerical Simulations for different turbulence intensities and different initially mono-sized droplets. It has been found that most water droplets do not completely evaporate within the flame due to their large latent heat of evaporation for the conditions considered here. Thus, the cooling effect due to the extraction of latent heat during the evaporation of water droplets dominates over the dilution of the concentration of reactants and gives rise to smaller reaction rate of reaction progress variable and thicker flame front than in the corresponding premixed turbulent flame without droplets. These effects (a) strengthen with decreasing droplet size due to higher rate of evaporation for smaller droplets, but (b) weaken with an increase in turbulence intensity. The interaction of water droplets with the flame affects the density-weighted displacement speed through its reaction and molecular diffusion components and the magnitudes of these components remain much greater than the components due to cross-scalar dissipation rate and two-phase coupling. The flame-water droplet interaction for the parameter range considered here acts to reduce the mean density-weighted displacement speed, consumption speed and turbulent flame speed, and this reduction becomes increasingly prominent with decreasing droplet diameter. However, it has been found that the presence of water droplets does not alter the qualitative nature of the strain rate and curvature dependences of both density-weighted displacement speed and consumption speed for the range of parameters considered here, but the correlation strength is altered by the presence of water droplets.

Tunable superhydrophobic titanium nitride surface by ultrafast laser processing

The interaction of water droplets to the engineered hierarchical surface structures depends on the synergy between the topographical and chemical modifications. In this work, we develop an ultrafast laser processing technology to create a robust superhydrophobic nanostructured titanium nitride (TiN) surface. The process is based on the manipulation of the surface geometry and the low-pressure technique's accelerated adsorption of Volatile Organic Compounds (VOC). The laser-processed surfaces are composed of nanoscale geometry overlapped with porous, spongy structures. The metal oxides formed on the TiN surface were hydrophilic and subjected to accelerated VOC adsorption by low-pressure technique via condensation reaction with surface hydroxyl groups formed by heterolytic adsorption of water molecules from the environment. The decrease of surface energy due to the presence of adsorbed hydrocarbons and the topography of the nanostructures allow the trapping of small volumes of air. The presence of a layer of air favour the Cassie-Baxter state of wetting state. Static contact angles ranging from 155 to 180° have been reached depending on the geometry of the nanostructures. A comparative study of vacuum processed and aged (15 days) samples under atmospheric conditions were also performed. The chemical analysis by XPS demonstrates that the water molecules attached to hydroxyl groups passivate these reactive sites and hinder the adsorption of VOC, decreasing the adsorption rate drastically under aging in atmosphereic conditions. In contrast, it is enhanced under low-pressure conditions due to the reduced amount of water vapour.

Inertial effects on the interaction of water droplets with turbulent premixed flames: A direct numerical simulation analysis

The effects of droplet inertia on the reaction zone structure, overall burning rate, and flame surface area during interaction of water droplets with a statistically planar turbulent premixed stoichiometric n-heptane-air flame based on three-dimensional carrier phase Direct Numerical Simulations have been analysed. Different initially mono-sized droplets are considered for this study in order to analyse the inertial effects for different droplet sizes. Droplet inertia has been demonstrated to have an important influence on the extent of evaporation of water droplets and water vapour concentration arising from evaporation within the flame. It has been found that the residence time of droplets within the flame increases due to droplet inertia and therefore the evaporation and the cooling effect associated with the extraction of latent heat are stronger for inertial droplets than in the case of hypothetical inertialess droplets. The stronger cooling effects for inertial droplets lead to smaller burned gas temperature and thicker flame than the corresponding cases with inertialess droplets. The aforementioned cooling effect induced by latent heat of evaporation of water droplets reduces the burning rate and the likelihood of obtaining high gradient magnitudes of reaction progress variable and temperature within the flame for the cases with water droplets in comparison to the corresponding purely gaseous turbulent premixed flames, and this tendency is stronger for inertial droplets. The stronger cooling effect, along with the reduction of reactant concentrations within the flame due to greater extent of evaporation for inertial droplets, gives rise to a smaller extent of flame area generation and overall burning rate than in the corresponding cases with inertialess droplets. It has been found that water droplet inertia acts to reduce the burning rate and the consumption rate of reactants per unit flame surface area during the interaction of water droplets with turbulent premixed flames within the parameter range analysed in this paper.

Physical and Mathematical Modeling of the Interaction of Water Droplets and High-Speed Gas Flow

Present work is devoted to physical and mathematical modeling of the secondary disintegration of a liquid jet and gas-dynamic breakup of droplets in high-speed air flows. In this work the analysis of the experiments of water droplet breakup in the supersonic flow with Mach numbers up to M = 3 was carried out. The influence of shock wave presence in the flow on the intensity of droplets gas-dynamic breakup is shown. A developed empirical model is presented. It allows to predict the distribution of droplet diameters and velocities depending on the gas flow conditions, as well as the physical properties of the liquid. The effect of the Weber and Reynolds numbers on the rate of droplets gas-dynamic breakup at various Mach numbers is shown. The obtained data can be useful in the development of mathematical models for the numerical simulation of two-phase flows in the combined Lagrange-Euler formulation.

The effect of interfacial interactions on the rheology of water in oil emulsions oleogelled by candelilla wax and saturated triacylglycerols

The effects of water-oil interfacial activity of candelilla wax (CW), glycerol monopalmitate (GMP), glycerol monooleate (GMO) and polyglycerol-polyricinoleate (PGPR) on the microstructure and rheology of W/O emulsions oleogelled with CW and fully hydrogenated soybean oil (FH) was investigated. The emulsifier with the highest interfacial activity was PGPR, followed by GMO, and GMP. Polar compounds of CW (CW-PC) also displayed interfacial activity. Interfacial interactions of the continuous lipid crystal network with the CW-PC and PGPR in W/O emulsions decreased the elastic modulus (G′) as the aqueous phase (AP) increased, indicating the water droplets behaved as inactive filler due to a weak interaction with the continuous phase. In contrast, the CW-PC and the monoglycerides had a cooperative interaction on the interfacial tension reduction. W/O emulsions produced with monoglycerols maintained or increased their G′ as the AP increased, denoting a strong interaction of water droplets and the continuous phase (i.e., active filler behavior). At constant content of AP and FH, G′ of emulsions tended to decline as the PGPR content increased, while the opposite was observed with emulsions produced with GMO. Adding 10% FH to the emulsions magnified both the active and inactive filler effects produced by GMO and PGPR, respectively.

Collisions of water droplets in the high-temperature air

The paper presents experimental research findings on the integral characteristics of the interaction of water droplets in a gas heated to high temperatures. An induction heater with an internal volume of about 0.13 m3 was used. It was fitted with quartz glass observation windows to record the characteristics of droplet motion before and after collisions. Air was used as a gas medium in the inductor. The parameters were varied in the following ranges: the air medium temperature 20–700 °С, the initial radius of droplets 0.3–0.9 mm, their velocity 0.1–7 m/s and impact angle 0–90°. At high gas temperatures, droplets were two-phase objects, because vapor bubbles formed in their near-surface layer. Frames with four collision regimes (coalescence, separation, disruption and bounce) were recorded. There were significant differences in the transformation of the water droplet surface and in the interaction of droplets with each other at various gas temperatures in the heating chamber. It has been shown that the growth of the air temperature increases the droplet lifetime and causes them to deviate from the spherical shape. The effect of the gas temperature on the position of droplet collision boundaries was determined with due consideration of the relative linear interaction parameter and the Weber number. When the gas temperature increases, two areas may form, corresponding to the bounce of droplets on the collision regime map. Differences were established in the number and dimensions of secondary water droplets formed from the collision of two initial ones. The total surface areas of liquid before and after droplet collisions were calculated.

Interaction of water droplets with soluble filter cakes in gas cleaning applications

In surface filtration processes, particles are collected on the upstream face side of the filter and form a filter cake. In commonly studied processes for the removal of particles from dust-laden gas streams, this cake remains on the filter surface until it is removed from the filter for example by pulse-jet cleaning. However, soluble particles are present in our ambient air as well as a common component of aerosols in various gas cleaning processes. When soluble particles are present in the filter cake and are exposed to fine water droplets throughout the process, the soluble particles dissolve. This can lead to a restructuring of the filter cake and the penetration of particles into the filter medium. This behavior in gas cleaning systems and its possible influence on the structure of the cake and pressure drop across the filter has not yet been systematically investigated.The experiments presented in this work show how soluble filter cakes restructure on hydrophobic glass fiber media after being exposed to water droplets at a filtration velocity of 3.5 cm s−1. Sodium chloride, potassium chloride and potassium sulfate particulate matter is separated from a dry air stream and subsequently exposed to different amounts of water droplets or a relative humidity above 85% with no liquid droplets present. The effect soluble species have on the operational behavior are observed by recording the pressure drop over the filter medium. Additionally, micrographs with a scanning electron microscope visualize the structural changes of the filter cakes. In combination with the pressure drop recordings, the images are used to analyze the restructuring of the particles on the filter when the salt is exposed to the liquid or high relative humidity only.

Water droplet impact on high-temperature peanut oil surface: The effects of droplet diameter and oil temperature

A series of experiments on water droplet interaction with high-temperature peanut oil were conducted and the effects of droplet diameter and oil temperature were discussed in the current study. Three typical regimes, including secondary jet, bubble and vapor explosion were observed during the impact process. Especially, water vapor explosion can be induced by solid-liquid contact (Toil≥241 °C) and liquid-liquid contact (Toil≥301 °C). The evolution model of water vapor was proposed and divided into three stages. Furthermore, to characterize the hazards of the vapor explosion, the heat values absorbed by single water droplet and itsmaximum fragmentized daughter droplet were both quantified. It is found that compared with the oil temperature, the droplet size has a more significant effect on the absorption heat of the droplet. For the solid-liquid explosion, with the decrease of the impact droplet diameter, the size of the vapor bubble increases, and resultantly the ratio of the absorption heat of the maximum daughter droplet to that of a single droplet increases. Additionally, the larger the impact droplet size is, the more daughter droplets are formed, resulting in a more violent explosion with long time.

Numerical Study of Bacteria Containing Droplets Aerosolized From Hot Surfaces

The process of water droplet interaction with hot surface can result in droplet shooting off the surface. When the water is contaminated with bacteria the interaction causes substantial ambient air contamination due to aerosolization of live or injured microorganisms. This study investigates the behaviour of water droplets interacting with heated surfaces in the film boiling regime. A suggested mathematical model considers droplet shooting off conditions and following airborne droplet evolution due to cooling. The critical size of the droplet capable of taking off was modelled as a function of the wall temperature and droplet size. Following the departure from the hot surface, droplet cooling time mainly depends on the initial droplet radius while the influence of the ambient temperature is marginal. The experimental part of the study was focused on (1) investigation of the size of droplets capable of departing from the hot surface, and (2) evaluation of the influence of cooling time on the survivability of two common environmental bacterial species, Gram-negative Escherichia coli and Gram-positive Bacillus subtilis. Droplets with the sizes of up to one millimetre shooting off the hot surfaces were detected, which correlates with the theoretical results. It was found that, under realistic physical conditions, the process of liquid interaction with hot surface does not ensure an efficient microbial inactivation. It was also shown that the shortest cooling time was associated with higher survival rates of both bacterial strains used in this study. However, even for the longest cooling time of 15 seconds the amount of live bacteria in the aerosolized droplet carrier can be substantially high with recovery rates of approximately 50% for B. subtilis.

Microporous polymer membrane assisted water induced electricity generation based on triboelectrification and electrostatic induction.

Water in its various forms has been found to be one of the most abundant sources of energy on the planet after solar energy, and hydroelectric power plays a key role in renewable-energy supplies. Traditionally, harvesting tremendous amounts of hydrodynamic energy requires the deployment of complex, bulky, and expensive electromagnetic generators, which become inefficient at lower volumes of flowing or falling water, and then the energy is stored when there is an excess, but these techniques remain largely unperfected. Regardless of the diversity of development strategies, adopted methodologies, and working mechanisms, there are a wide range of energy scavengers, to effectively harness environmental friendly alternative energy sources. Robust, sustainable and technologically effective water energy harvesting devices, especially hydroelectric nanogenerators, are in the research spotlight globally, due to their numerous benefits to society, including cost effectiveness, clean and continuous electricity generation, and environmental applicability. Here the design and working mechanism involved in the development of a microporous polymer membrane assisted unique hydroelectric generator (MPA-HEG) based on triboelectrification and electrostatic induction phenomena is reported, which scavenges energy from continuously dripping water droplets sliding onto the surface of a hydrophobic microporous polymer membrane. MPA-HEG utilizes a very simple architecture that consists of a hydrophobic microporous polymer, poly(tetrafluoroethylene) (PTFE), membrane on a single-sided copper-clad laminate as a substrate and an aluminium electrode. Unlike other reported water energy harvesting devices with similar functionalities, the rational design of MPA-HEG does not necessitate any technologically complex structures to be embedded in the substrate. It has also been revealed that the interaction of water droplets on the smooth, water-resistant solid polymer surface in MPA-HEG switches ‘ON’ and connects the originally disconnected equivalent electrical components at the solid–liquid–solid interfaces, giving an uninterrupted electrical circuit, and transmuting the conservative interfacial effects into a bulk mechanism. Consequently, the instantaneous power output shows a vast increase over equivalent devices that are constrained either to triboelectric interfacial effects or moisture-induced electricity generation. This could serve the purpose of validating the inherent advantages of developing self-powered electronic devices, and this approach can also be effectively exploited for boosted power generation with realistic future applications.

Water transport and absorption in pharmaceutical tablets \u2013 a numerical study

The quality of a coated pharmaceutical tablet can be strongly affected by the interactions of water droplets with the porous substrate during processes such as coating process. Three different mechanisms co-exist in the coating process: water spreading, absorption and evaporation. Disentangling the fundamental understanding of these phenomena can therefore be crucial for achieving a higher quality of the products (e.g. a longer shelf-life of the tablets) and for controlling the efficiency of the process. This paper aims to investigate the spreading and absorption mechanisms after droplet impingement on a tablet using a Lattice-Boltzmann methodology. Our numerical results (droplet height and spreading, penetration depth and absorbed volume) are in a good agreement with experimental data and numerical simulations available in the literature. In particular, the spreading phase is characterised by the capillary spreading time scale, as confirmed by previous studies. In contrast to previous studies, we find that the absorption process begins at times shorter than the capillary spreading time but with a different power-law in the absorbed volume. We explain this behaviour through a modified Washburn law that takes into account three-dimensional effects. Our data can be used as a benchmark to test novel mathematical models.

Comparative study of water droplet interactions with molten lead and tin

Research on stream explosion between coolant and molten metal has a great significance for accident prevention in industry safety. A series of experiments and corresponding comparative study were carried out on the water droplet interactions with molten lead and tin using a high-speed camera. The typical factors including the water droplet dropping height and thickness of molten metal were focused. The results show that three phenomena of Droplet breakup, Bubble and Crown can be observed in the water droplet interactions with both molten lead and tin. The crown height increases with an increase in the water droplet dropping height. However, it firstly decreases and then becomes relatively stable as the thickness of the molten metal increases. Especially, due to the different density, viscosity and surface tension between molten lead and tin, some significant differences can be found in phenomenon evolution and regimes, evaporation time of water droplet, crown height etc. A smaller bubble and an additional liquid column appear on the lead surface. The evaporation time of water droplet on molten lead is slightly shorter than that on molten tin. The maximum crown height in the water droplet interaction with molten lead is much lower than that in the water droplet interaction with molten tin.

Effect of the Angular and Linear Parameters of Interaction of Water Droplets of Various Shapes on the Characteristics of Their Collisions

The influence of the dimensionless angular and linear parameters of interaction of water droplets shaped as a sphere, an ellipsoid, and a conventionally liquid disk on the characteristics (regimes) of their collisions in air (bouncing, coalescence, separation, or disruption) is studied by using a system of high-speed video recording. Conditions of sustainable implementation of this interaction are determined. Maps of the corresponding regimes are constructed and compared with available data. The characteristic sizes, the number of liquid fragments formed in collisions, and the total areas of the evaporation surface are calculated. It is demonstrated that the liquid surface area in the case of collisions of conventionally liquid disks is significantly (by several times) greater than that in the case of spherical droplets.

Industrial dust control in cement production as a factor in significantly reducing the negative impact of cement plants on the environment

Nowadays environmentalization of plants is one of intrinsic elements of Ukrainian environmental security. Even the most modern cement plants are imperfect, they create certain risk of environment pollution and menace to human health at adjacent areas. The cement plants of Ukraine have morally and physically obsolete equipment, they pose a risk to the health of the population of the adjacent territories. The article proposes a highly reasonable way to reduce negative environment effect from cement plants, namely, environmentalization of their process cycles. The transformation of existing cement plants with their outdated equipment and technology into an environmentally friendly module is one of the methods of ecologization of production on operating plants on the production of cement. The developed concept of environmentalization of cement plants consists in turning plant into an environment-friendly module. This is achieved by the fact that each separate technological process becomes an autotrophic environmental module; technological processes within the technological complex are interconnected by intra-production links; internal links between modules ensure the use of waste from previous processes as a secondary raw material of subsequent processes; In the structure of the cement plant, there is an environmentally friendly process, which serves as "a module of internal relations" with minimal energy resources. The central element of this “internal communications module” is the system of suppressing and trapping cement dust. Analyzed the classification scheme of the system of combating industrial dust and gaseous emissions of cement plants. It is implemented by five main functional elements. Тhese are binding, retention, trapping, scattering of pollutants and air purification from pollutants. The most effective methods for combating industrial dust of cement plants are given: hydrodynamic, aerodynamic, and thermophysical method. Development recommendations for improving the process of dedusting process materials from cement plants foam. The mechanism of interaction of water droplets and dust particles in the air is analyzed depending on their size. An optimal fogging scheme is proposed to achieve maximum sanitary and hygienic and environmental efficiency. Methods of dust suppression at various sites of the cement plant are proposed, taking into account the specifics of technological processes, as well as ways to implement them.