Characterisation of colloidal dispersions using ultrasound spectroscopy and multiple-scattering theory inclusive of shear-wave effects
Characterisation of colloidal dispersions using ultrasound spectroscopy and multiple-scattering theory inclusive of shear-wave effects
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DOI：
10.1016/j.cherd.2016.08.008
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发表时间：
2016-10-01
影响因子：
3.9
通讯作者：
Pinfield, V. J.
中科院分区：
文献类型：
--
作者：
Forrester, D. M.;Huang, J.;Pinfield, V. J.
超声波光谱法测量通过样品传播的声波的衰减。在浆料中，超声信号作为颗粒尺寸、浓度和密度的函数而变得高度衰减。为了监测泥浆中的这些性质，需要使用数学模型对衰减进行解释。我们研究不同大小的二氧化硅悬浮在水中，在不同的浓度，和频率高达100 MHz。我们确定，一个新的多重散射理论，包括剪切波的再转换效应（即转换的压缩波剪切波和回压缩波在颗粒/液体边界）是成功的衰减预测的范围高达：120 MHz和20%（体积）。超过该水平，具有剪切效应的模型开始偏离真实的衰减，但仍然比仅对入射压缩波建模更能代表实验结果。因此，剪切波再转换建模是必不可少的，以更准确地反映在悬浮液系统中的固体颗粒的衰减光谱，并指示超声衰减作为颗粒尺寸减小和浓度增加。(C)2016作者（S）由Elsevier B. V.代表化学工程师学会出版。
Ultrasonic spectrometry measures the attenuation of a sound wave propagating through a sample. In slurries the ultrasound signal becomes highly attenuated as a function of particle size, concentration and density. To monitor these properties in slurries the attenuation requires interpretation using a mathematical model. We examine different sizes of silica suspended in water, at different concentrations, and frequencies up to 100 MHz. We determine that a new multiple scattering theory inclusive of shear-wave reconversion effects (i.e. conversion of compressional wave to shear wave and back to compressional wave at the particle/liquid boundary) is successful for attenuation prediction in the range up to ::120 MHz and 20% (by volume). Beyond this level the model with shear-effects begins to deviate from the real attenuation, but is still more representative of the experimental results than modelling only an incident compressional wave. Thus, shear-wave reconversion modelling is essential to more accurately reflect the attenuation spectra in a solid particle in suspension system, and dictates the ultrasonic attenuation as particle sizes decrease and concentration increases. (C) 2016 The Author(s). Published by Elsevier B.V. on behalf of Institution of Chemical Engineers.