Acceleration of Micro-Explosion of Emulsified Fuel.

乳化燃料微爆炸的加速。

• 批准号: 61550707
• 负责人: KITAMURA Yoshiro
• 金额: $ 1.02万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550707/
• 关键词: Micro-Explosion; Flashing; Flashing Temperature; Emulsion; Emulsified Fuel Superheated Emulsion; 過熱エマルション; 過熱度; 突沸

The flashing temperature of superheated water droplets dispersed in fuels was measured to investigate the micro-explosion of emulsified fuels. For fuels, kerosene, diesel fuel and tetradecane were used. Water, aqueous methanol and ethanol solutions were used as the dispersed phase. The emulsions were stabilized by Span 80 whose concentration was 10 wt% of the dispersed phase. A small amount of the emulsion samples in a test tube were heated in an oil bath at a rate 2 K/min until explosive vaporization occurred. The emulsions were prepared by two methods: mechanically, using a homogenizer for 10 min atIt was observed that the flashing temperature had broad distribution. Thus, 30-50 samples were measured to determine the distribution of the flashing temperature for one emulsion. The flashing temperature of emulsions decreases with increasing fractions of the dispersed phase. Such a reduction is independent of the preparation method, mechanically or ultrasonically. The superheat, the difference of the 50% flashing temperature and the boliling temperature of the dispersed phase, was correlated as a function of the surface area per unit volume of emulsions. The coefficient of this function, however, were observed to depend on the substance of both the continuous and dispersed phase. This dependence was expressed as a function of the surface excess of surfactant which was determined by measuring the interfacial tension.

为了研究乳化燃料的微爆现象，对分散在燃料中的过热水滴的闪燃温度进行了测量。燃料方面，使用煤油、柴油和十四烷。水、甲醇水溶液和乙醇水溶液用作分散相。用Span 80稳定乳液，Span 80的浓度为分散相的10wt%。将试管中的少量乳液样品在油浴中以2K/min的速率加热，直到发生爆炸性蒸发。用机械法和均质器均质10 min两种方法制备了乳化液，发现闪速温度分布较宽。因此，测量30-50个样品以确定一种乳液的闪蒸温度的分布。乳液的闪蒸温度随着分散相的分数的增加而降低。这种还原与制备方法无关，机械或超声。将分散相的50%闪蒸温度和沸腾温度之差的粘度作为每单位体积乳液的表面积的函数进行关联。然而，这个函数的系数，观察到依赖于连续相和分散相的物质。这种依赖性表示为表面活性剂的表面过量的函数，其通过测量界面张力来确定。

项目成果

北村吉朗: International Journal of Engineering Fluid Mechanics. 1. 16-27 (1988)

Yoshiro Kitamura：国际工程流体力学杂志。1. 16-27 (1988)

Y. Kitamura: "Critical Superheat for Flashing of Superheated Liquid Jets" Industrial and Engineering Chemistry, Fundamentals. 25. 206-211 (1986)

Y. Kitamura：“过热液体射流闪蒸的临界过热”工业和工程化学，基础知识。

北村吉朗: 化学工学論文集. 12. 731-734 (1986)

北村芳郎：化学工程论文。12. 731-734 (1986)

北村吉朗ら: 化学工学論文集. 12. 327-333 (1986)

Yoshiro Kitamura 等人：化学工程论文。12. 327-333 (1986)

北村吉朗: 石油学会誌. 31. (1988)

Yoshiro Kitamura：日本石油学会杂志 31。（1988）