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首页> 外文期刊>Chemical Engineering Science >High resolution experimental measurement of turbulent flow field in a high pressure homogenizer model and its implications on turbulent drop fragmentation
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High resolution experimental measurement of turbulent flow field in a high pressure homogenizer model and its implications on turbulent drop fragmentation

机译：高压均质器模型中湍流场的高分辨率实验测量及其对湍流液滴破碎的影响

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摘要

Particle image velocimetry is performed on a model of a high pressure homogenizer, scaled for qualitative similarity of the one phase turbulent flow field in a production scale homogenizer. Flow fields in gap entrance, gap and gap outlet chamber are obtained with high resolution. The measurements show gap flow development and formation of a turbulent wall adherent jet when exiting into the outlet chamber. Turbulent kinetic energy spectra show how the turbulent energy available for fragmentation is transported over distance along the jet centre axis. The high resolution images are also used together with a Kolmogorov-Hinze theory framework for discussing drop fragmentation together with a direct evaluation of disruptive stresses from measurements. For the turbulent inertial mechanism large drops experience high fragmenting force close to eight gap heights downstream of the gap exit whereas this occurs closer to 20 gap heights for smaller drops. The turbulent viscous mechanism is most efficient at a downstream distance of eight gap heights into the outlet chamber for all drops sizes.
机译：颗粒图像测速仪是在高压均质器的模型上执行的，该模型针对生产规模均质器中一相湍流流场的定性相似性进行了缩放。高分辨率获得间隙入口，间隙和间隙出口腔中的流场。这些测量结果表明，当进入出口室时，间隙流动会发展并形成湍流的壁粘附射流。湍动能谱显示了可用于破碎的湍流能量如何沿射流中心轴沿距离传输。高分辨率图像还与Kolmogorov-Hinze理论框架一起用于讨论液滴破碎以及直接评估测量中的破坏性应力。对于湍流惯性机构，大液滴会在间隙出口下游的八个间隙高度附近受到较大的破碎力，而对于较小的液滴，这种液滴会接近20间隙高度。对于所有尺寸的液滴，湍流粘性机构在进入出口腔室的八个间隙高度的下游距离处最有效。

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