应用粒子图像测试技术测量球床多孔介质单相流动的流场
发布时间：2018-11-16 15:50
【摘要】：多孔介质在生产生活以及科技发展中的应用十分广泛,随着能源、化工、冶金和原子能等领域技术的发展,以及近代工农业生产技术的进步,大量多孔介质的传热传质问题逐渐出现,进一步促进了多孔介质学科的形成和发展,使其成为当今科学技术中令人瞩目的研究热点之一.通过实验获得准确的实验图像和数据,并使用相应软件对实验所得数据和流体流动图像进行深度分析,这样既有真实可靠的实际数据,又有直观的理论的支持,使对多孔介质的研究更为完善.实验结合粒子图像测试技术和折射率匹配技术对叉排排列玻璃球多孔介质填充床内的流体流动转变过程进行流场测试,并提取数据,采用Tecplot软件对提取数据进行处理,得出流体流动机理的转变过程.实验固相为由直径25 mm水晶玻璃球叉排堆积而成的填充床,液相为65%苯甲醇和35%无水乙醇配制的匹配液.液相与固相的折射率都为1.477,成功消除由于折射率不匹配引起的激光光线偏折.实验得到雷诺数为4.7 ≤Re ≤1000时球床内流场图,对比不同雷诺数时流场和流线变化得出:随着雷诺数的增加,流线变得越来越紊乱;当雷诺数在220以上时,球床内漩涡在尺寸变化上出现突跃,在位置和形态变化表现出随机特征,预示进入了稳定的湍流.
[Abstract]:Porous media is widely used in production and life and in the development of science and technology. With the development of technologies in the fields of energy, chemical industry, metallurgy and atomic energy, as well as the progress of modern industrial and agricultural production technology, The problem of heat and mass transfer in a large number of porous media has emerged gradually, which has further promoted the formation and development of the subject of porous media and has become one of the most attractive research hotspots in science and technology nowadays. The accurate experimental images and data are obtained through experiments, and the experimental data and fluid flow images are analyzed in depth by using the corresponding software. This is not only true and reliable actual data, but also intuitive theoretical support. The study of porous media is more perfect. In the experiment, the flow field of the fluid flow transition in the packed bed of the porous media packed with the cross-arranged glass spheres was measured with particle image testing technique and refractive index matching technique, and the data were extracted, and the extracted data were processed by Tecplot software. The transition process of fluid flow mechanism is obtained. The experimental solid phase is a packed bed packed with 25 mm crystal glass spheroidal cross row. The liquid phase is composed of 65% benzyl alcohol and 35% anhydrous ethanol. The refractive index of both liquid and solid phase is 1.477. the laser beam deflection caused by refractive index mismatch is successfully eliminated. The flow field diagram of spherical bed is obtained when Reynolds number is 4. 7 鈮，
本文编号：2335932
[Abstract]:Porous media is widely used in production and life and in the development of science and technology. With the development of technologies in the fields of energy, chemical industry, metallurgy and atomic energy, as well as the progress of modern industrial and agricultural production technology, The problem of heat and mass transfer in a large number of porous media has emerged gradually, which has further promoted the formation and development of the subject of porous media and has become one of the most attractive research hotspots in science and technology nowadays. The accurate experimental images and data are obtained through experiments, and the experimental data and fluid flow images are analyzed in depth by using the corresponding software. This is not only true and reliable actual data, but also intuitive theoretical support. The study of porous media is more perfect. In the experiment, the flow field of the fluid flow transition in the packed bed of the porous media packed with the cross-arranged glass spheres was measured with particle image testing technique and refractive index matching technique, and the data were extracted, and the extracted data were processed by Tecplot software. The transition process of fluid flow mechanism is obtained. The experimental solid phase is a packed bed packed with 25 mm crystal glass spheroidal cross row. The liquid phase is composed of 65% benzyl alcohol and 35% anhydrous ethanol. The refractive index of both liquid and solid phase is 1.477. the laser beam deflection caused by refractive index mismatch is successfully eliminated. The flow field diagram of spherical bed is obtained when Reynolds number is 4. 7 鈮，
本文编号：2335932
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