Evolution of a liquid-drop aerosol cloud in the atmosphere

Modeling the evolution of the aerosol cloud of toxicants in the atmosphere

“…2). Figure 2 shows the rate of evaporation G in height, defined as the mass of evaporated toxicant per meter of fall height and the corresponding atmospheric temperature t. Completely evaporation of drops of a maximum initial size of 3 mm took place at an altitude of 2200 m. Good qualitative and satisfactory quantitative coincidence of the calculations and analysis contained in [10] allows us to recommend the calculation methodology developed by the authors for its use in assessing the impact of thermal energy facilities, chemical plants, etc. on the environment.…”

“…Integration of the system of equations for each fraction until the droplet evaporates completely or when it reaches, the surface of the Earth is carried out. The reliability of the results of numerical modelling of the formation and the dynamics of the change in aerosol clouds of toxicants in the atmosphere comparison with typical experimental data of the results of the launch of the "Proton" carrier rocket on October 26, 2007 [10] was verified by. In this case, the toxicant was an asymmetric dimethyl hydrazine (component of liquid fuel), and the height of the formation of the toxic aerosol cloud was about 30 103 m. The projections of the trajectories of aerosol particles of the main calculated fractions shows in Fig.…”

“…As shown by the analysis of the experimental data [10] in the range of moderate (Re≈10÷100) and small (Re≤1) Reynolds numbers in the region of large Bond numbers Во typical for the aerosol droplets under consideration, the deformation of the droplet from the Weber number We [11] is determined by the relation:…”

Dynamics and Heat and Mass Transfer of Liquid-Droplet Cloud in the Emergency Discharge of Aviation Fuel into the Atmosphere

“…The processes of repeated crushing of drops, evaporation and heat exchange with the ambient air were taken into account. Within the framework of the assumptions made, the mathematically considered process is described by a system of equations [2][3][4]. The motion of a drop in a Cartesian coordinate system was described by the equations of motion in the velocity field of the steady gas flow with allowance for the forces of viscous drag and gravity:…”

Experimental study of loss in stability of the drop shape in the approach air flow

“…These processes are of practical importance in meteorology (the formation of a spectrum of droplet sizes of atmospheric precipitation [2]), in engine building (the dispersion of fuel droplets in internal combustion engines and liquid rocket engines [3,4]), in ecology problems (evolution of a cloud of droplets of toxic components Liquid rocket fuels, formed during depressurization in the atmosphere of fuel tanks of carrier rockets [5]) and in a number of other branches of engineering and technology. In this paper, we consider an experimental facility for studying the deformation of a stationary droplet in an air flow.…”