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Evaporation characteristics of single n-dodecane droplet in alcohol mixture |
School of Automobile and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract For a single n-dodecane droplet in different convective thermal environments, the evaporation characteristics were simulated by nonequilibrium evaporation model with the considerations of physical properties of droplet and ambient gas. The effects of the environment parameters of ambient pressure, temperature, convection intensity and C2H5OH(g)/H2O(g) concentration on the evaporation process were investigated. The results indicate that ambient pressure, temperature and convection intensity are the major effect factors on evaporation characteristics, but the mass fraction of C2H5OH(g)/H2O(g) has little effect on the droplet vaporization. The droplet evaporates faster with the increasing of ambient temperature and convection intensity. The effects of ambient pressure on droplet evaporation are significantly dependent on temperature and relative velocity of the ambient gas flow. The effect of pressure shows markedly different under weak convection and intensive convection conditions. The droplet lifetime is appreciably shortened with the increasing of mass fraction of C2H5OH(g), but appreciably prolonged with the increasing of H2O(g) concentration.
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Received: 12 November 2012
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