Numerical simulation of evaporation of volatile liquids

Numerical investigation of flammable vapour cloud formation from pools of heated organic liquids

“…Generally, the effect of pool size on the evaporation rate decreases with the increase of the wind velocity and decrease of the initial pool depth. The similar effect also was predicted using CFD for non-heated liquid such as hexane ( Galeev et al, 2015 ), where the initial liquid temperature was equal to the temperature of ambient air. In this paper, it is shown that a decrease in the evaporation rate with an increase in pool size largely occurs because of an enhancement of the concentration-induced negative buoyancy of the air-vapour cloud.…”

“…The pool evaporation model is applied in conjunction with the dispersion model in order to take into account the complex interaction between pool evaporation and vapour dispersion processes. The similar approach has already been employed in our previous studies ( Galeev and Ponikarov, 2014 ; Galeev et al, 2013 , Galeev et al, 2015 , Galeev et al, 2020 ), however, the present model has some essential differences from the earlier one: 1) the semi-empirical vertical profiles for mean wind speed and turbulence quantities are specified as the boundary conditions at the inlet to the computational domain instead of profiles from repeated calculations; 2) the turbulence model coefficients are adjusted in order to improve the homogeneity of turbulence quantities and velocity profiles throughout the computational domain; 3) the standard k- ε model is chosen instead of realizable k- ε model in order to be able to adjust the coefficients of the turbulence model in the Fluent; 4) the mole-based formulation for the correction for Stefan flow is used instead of the mass-based formulation; 5) a limiting value of the logarithmic term in the equation for the correction for Stefan flow is proposed to avoid «unphysical» values of the evaporation rate at liquid temperatures close to the boiling point. The modified mathematical model is validated against published experimental data with respect to both pool evaporation and vapour dispersion simulation.…”

Determination of the maximum droplet diameter during centrifugal extraction, soil analysis, contamination and waste disposal

“…Considering the mechanisms of formation and destruction of a drop, it should be noted that when a drop moves inside another liquid or gaseous medium, they usually undergo destruction, thereby forming more particles [10,11,[16][17][18][19][20]. This process is widely found in phenomena such as atomization, liquid-liquid extraction, absorption, separation and others.…”

Numerical Simulations as Tool to Predict Chemical and Radiological Hazardous Diffusion in Case of Nonconventional Events

“…The University of Rome Tor Vergata, counting on the synergic work between the Faculty of Engineering and the Faculty of Medicine and Surgery, is facing these new problems with innovative working approaches voted to use the expertise developed in classic scientific disciplines in an unconventional way. In this paper the authors will demonstrate how the numerical simulations, in particular CFD techniques [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39], can be a powerful tool to predict the consequences of particular accidents giving to the decision makers the chances to better manage the phases of accidents or terroristic events, reducing the risks associated. The authors will start to face the problem of toxic dust resuspension analysing first the problem itself that one of the possible causes of this phenomenon can be the LOVA and will show how these accidents can be approached with the numerical simulations.…”