Numerical simulation for evaporation of chemical agent droplet
Document typeConference report
Rights accessOpen Access
Recently, terrorism is one of most daunted dangers in the world. Various terrorisms can come about. Biological and chemical terrors have particularly high mortality rate, and tend to wreak the secondary disaster. For these reasons, research and development of measures for decontaminations are emergent and of key issue on a world scale. Sulfur mustard (HD) is one of chemical agent used to commit terrorism. HD gas has severe toxicity and long-period damage because of persistent agent. In addition, as HD gas achieves the toxicity even if it only contacts on a skin, it is important that HD-contaminated objects are decontaminated quickly. In the present study, HD gas emission from a surface of HD droplet is numerically researched. HD gas emission is usually investigated with experiments, but the experiment is so dangerous because of the toxicity. Therefore, in this study, CFD (computational fluid dynamics) is used to reproduce the emission. We propose a volatilization model which can estimate the volatilization of a chemical agent with the saturated vapor pressure of chemical agent and physical quantities of the air. We apply our three dimensional volatilization prediction code to a HD droplet placed on a wind tunnel wall. Comparing the numerical results with the experimental data, it is confirmed that the numerical data are in good agreement with the experimental data. In addition, volatilization volume is coupled with droplet geometry to simulate the temporal change of droplet shape and residual mass. It is reasonably predicted that the droplet volume gradually decreases as volatilization proceeds until the droplet disappears.
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