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    赵曼, 许治嘉, 赵辉, 许建良, 李伟锋, 刘海峰. 水煤浆流变性和表面张力对其微观破裂的影响[J]. 华东理工大学学报(自然科学版), 2022, 48(6): 715-722. DOI: 10.14135/j.cnki.1006-3080.20210920001
    引用本文: 赵曼, 许治嘉, 赵辉, 许建良, 李伟锋, 刘海峰. 水煤浆流变性和表面张力对其微观破裂的影响[J]. 华东理工大学学报(自然科学版), 2022, 48(6): 715-722. DOI: 10.14135/j.cnki.1006-3080.20210920001
    ZHAO Man, XU Zhijia, ZHAO Hui, XU Jianliang, LI Weifeng, LIU Haifeng. Influence of Rheological Property and Surface Tension on the Micro Breakup of Coal Water Slurry[J]. Journal of East China University of Science and Technology, 2022, 48(6): 715-722. DOI: 10.14135/j.cnki.1006-3080.20210920001
    Citation: ZHAO Man, XU Zhijia, ZHAO Hui, XU Jianliang, LI Weifeng, LIU Haifeng. Influence of Rheological Property and Surface Tension on the Micro Breakup of Coal Water Slurry[J]. Journal of East China University of Science and Technology, 2022, 48(6): 715-722. DOI: 10.14135/j.cnki.1006-3080.20210920001

    水煤浆流变性和表面张力对其微观破裂的影响

    Influence of Rheological Property and Surface Tension on the Micro Breakup of Coal Water Slurry

    • 摘要: 以神华煤和华电煤为原料制备了质量分数为58%~62%的水煤浆,使用旋转流变仪、静/动态表面张力仪、高速摄像机和图像处理软件等研究了水煤浆理化参数对其微观破裂过程的影响。水煤浆属于剪切变稀的非牛顿流体,采用Herschel-Bulkley模型建立了水煤浆流变关系式;与静态表面张力不同,水煤浆的动态表面张力随着特征气泡时间的增加先减小后增加,表面张力最小值出现在200 ms附近;获得了基于水煤浆流变性和动态表面张力函数的水煤浆微观破裂特征直径与时间的关系式。

       

      Abstract: During slurry breakup, the throat of the liquid bridge keeps shrinking. When the minimum characteristic diameter of the liquid bridge is close to the size of the solid particle, the slurry will exhibit complex variation characteristics with time, which is significantly different from those of pure liquid. Therefore, scrutinizing the micro breakup characteristics of slurry will help reveal the atomization mechanism and improve the modeling of slurry. Here, Shenhua and Huadian coals are used as raw material to prepare coal water slurry in a mass fraction range of 58%—62%. The influence of the physical and chemical parameters of coal water slurry on its microscopic breakup processes is studied by rotary rheometer, static surface tension meter, dynamic surface tension meter, high-speed camera and image processing software. Considering that coal water slurry is a shear thinning non-Newtonian fluid, the Herschel-Bulkley model is used to establish the rheological relationship of coal water slurry. Unlike static surface tension, the dynamic surface tension of coal water slurry decreases with the increase of the characteristic bubble time. The minimum surface tension is achieved about 200 ms. Finally, based on the rheological properties and the dynamic surface tension of coal water slurry, the relationship between the characteristic diameter changes of coal water slurry micro-breakup and the breakup time is obtained.

       

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