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J Korean Soc Environ Eng > Volume 41(9); 2019 > Article
J Korean Soc Environ Eng 2019;41(9): 463-472. doi: https://doi.org/10.4491/KSEE.2019.41.9.463
환경조건 변화에 따른 HD 증발 지속 특성 및 예측
임종선, 정진우, 변기득
The Characteristics and Prediction of HD Vaporization Persistence Depending on Environmental Conditions
Jong-Sun Lim, Jin-Woo Jeong, Ki-Deuk Byun
The Armed Forces CBR Defense Research Institute
Corresponding author  Jong-Sun Lim ,Tel: 02-2008-6570, Fax: 02-3412-8064, Email: jongsun-lim@hanmail.net
Received: June 24, 2019;  Revised: August 8, 2019;  Accepted: August 23, 2019.  Published online: September 30, 2019.
HD (mustard gas), a chemical weapon, can be used in chemical warfares or terror attacks. HD gas can cause critical damage to the human body when inhaled, which makes it important to determine the threat of HD from contaminated areas. When HD is sprayed to the land surface, its vaporization persistence characteristics are influenced by the changes of natural environment including the type of the surface, temperature, wind speed and the drop size of HD. Our purpose is to verify the characteristics of HD vaporization persistence and to suggest a vaporization persistence time prediction equation which can predict the vaporization persistence time of HD under any given environmental conditions.
A small scale wind tunnel with a diameter of 5 cm was used as an experimental equipment to measure the vaporization characteristics of HD. The wind tunnel was designed according to the atmospheric boundary layer theory to exhibit the distribution of wind speed in actual natural environment. The experiment was conducted by controlling the temperature and wind speed after spraying HD to the glass, sand and concrete samples. The HD vaporization persistence time was measured till the Vaporization Stabilized Point (VSP) where the concentration of the HD vaporization into the atmosphere from the liquid HD on the surface is almost settled.
Results and Discussion:
The changes of the temperature had the biggest effect on the changes in HD vaporization persistence time and then the wind speed and lastly the drop size of HD. The correlation between changes of environment and HD vaporization duration was verified and the formula of predicting HD vaporization duration was consequently derived.
We compared the results from the HD vaporization time experiment to the results from the vaporization persistence time prediction equation. Because the experimental duration values and predicted values are within the similar range of distribution, the usefulness of the formula suggested by the research is verified.
Key Words: HD, Vaporization Duration, Prediction of Duration, Wind-tunnel, Vaporization Stabilized Point
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