Evaporation characteristics of multi-component liquid |
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Authors: | Katsuhiro Okamoto Norimichi Watanabe Yasuaki Hagimoto Koji Miwa Hideo Ohtani |
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Institution: | 1. National Research Institute of Police Science, 6-3-1, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan;2. Yokohama National University, 79-7, Tokiwadai, Hodogaya-ku, Yokohama City, Kanagawa 240-8501, Japan;1. School of Mechanical Engineering, National Engineering Laboratory for Automotive Electronic Control Technology, Shanghai Jiao Tong University, Shanghai 200240, China;2. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;1. Forensic Science Program, School of Criminal Justice, Michigan State University, East Lansing, MI 48824, United States;2. Department of Chemistry, Michigan State University, East Lansing, MI 48824, United States |
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Abstract: | Evaporation rate of multi-component liquid such as motor gasoline is expected to change greatly with progress of evaporation because its composition changes. Therefore it is difficult to predict accurately amount of generated combustible vapor in the case that a multi-component liquid is spilt on a floor. Then, we assumed an evaporation model that composition of the vapor obeys the Raoult's law which considers the activity coefficient. Using the model, we calculated the vapor composition, the vapor pressure and the evaporation rate of the liquid. Then, comparison was done between the calculated values and the measured values obtained in this study. “Weight loss fraction” was used as a parameter signifying the progress of evaporation. The variations of the evaporation property were accurately predicted by the model. We derived a prediction model of the amount of generated combustible vapor from the relation between weight loss fraction and evaporation rate. It was found that the amount of generated vapor was expressed as a logarithmic function of time in case of a five-component liquid. Furthermore, we showed that the predicted flash point of a liquid using the composition obtained from the model was in good agreement with an experimental result. |
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