Experimental Investigation of Microexplosion Occurrence in Water in Diesel Emulsion Droplets during the Leidenfrost Effect
Experimental Investigation of Microexplosion Occurrence in Water in Diesel Emulsion Droplets during the Leidenfrost Effect
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DOI：
10.1021/ef501588z
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发表时间：
2014-10
期刊：
影响因子：
5.3
通讯作者：
Mohammed Yahaya Khan;Z. A. A. Karim-Z.-A.-A.-Karim-31885959;A. Aziz;I. Tan
中科院分区：
文献类型：
--
作者：
Mohammed Yahaya Khan;Z. A. A. Karim-Z.-A.-A.-Karim-31885959;A. Aziz;I. Tan
微爆现象是以乳化柴油中的水为燃料，同时降低柴油机排气中颗粒物和氮氧化物的原因。本文以悬浮在电热板上的丝式热电偶上的乳状液液滴为热源，研究了两种不同制备方法制备的乳状液微爆现象的演化规律。通过均质器和机械搅拌器与5，10，和20%的水按体积产生的乳液的微爆行为可视化。一台与数据记录系统同步的高速摄像机被用来捕捉这些事件。结果表明，分散液滴的大小和分布对等待时间、膨化频率、初始温降和微爆温度均有影响。没有观察到所有的均质化乳液的微爆炸，而所有的机械搅拌的乳液开发微爆炸。
Microexplosion phenomenon is attributed for achieving simultaneous reduction of particulate matter and nitrogen oxides in diesel engine exhaust when water in diesel emulsion is used as fuel. In this work, an emulsion droplet suspended on a wire-type thermocouple on a hot plate as the heat source was used to study the evolution of microexplosion phenomenon of emulsions prepared by two different methods. Microexplosion behavior of emulsions produced by a homogenizer and mechanical stirrer with 5, 10, and 20% water by volume was visualized. A high-speed camera synchronized with a data-logging system was used to capture the events. The results show that the waiting time, puffing frequency, initial temperature drop, and microexplosion temperature were affected by the size and distribution of the dispersed water droplets. No microexplosion was observed for all of the homogenized emulsions, while all of the mechanically stirred emulsions developed microexplosions.