TURBIDITY FLUCTUATIONS IN FLOWING SUSPENSIONS
TURBIDITY FLUCTUATIONS IN FLOWING SUSPENSIONS
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DOI：
10.1016/0021-9797(85)90309-1
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发表时间：
1985-01-01
影响因子：
9.9
通讯作者：
GREGORY, J
中科院分区：
文献类型：
--
作者：
GREGORY, J
由于样品体积中颗粒数量的随机变化，透射通过流动悬浮液的光强度显示出关于平均值的波动。假设粒子数的变化是泊松分布的，可以表明，强度波动的均方根（rms）值取决于粒子的散射系数和它们的浓度的平方根。对于单分散悬浮液，均方根值和浊度测量值的组合非常简单地得出颗粒数浓度，因此（如果体积分数已知）得出粒度。该程序不需要关于颗粒光学性质的信息，并且应该适用于非常宽的浓度范围。一个简单的考虑的影响的heterodisperity表明，均方根测量的解释是不那么直接的情况下，单分散悬浮液。乳胶和粘土悬浮液的均方根值的测量报告，结果与理论预测大致一致。它的结论是，浊度波动的测量可能是一个非常有用的手段，研究聚集和解聚现象，并可以形成在线监测技术的基础。
The intensity of light transmitted through a flowing suspension shows fluctuations about the mean value because of random variations in the number of particles in the sample volume. Assuming that the variations in particle number are Poisson-distributed, it can be shown that the root mean square (rms) value of the intensity fluctuations is dependent on the scattering coefficient of the particles and the square root of their concentration. For monodisperse suspensions, a combination of the rms value and the measured turbidity leads very simply to the particle number concentration and, hence (if the volume fraction is known), to the particle size. This procedure requires no information on the optical properties of the particles and should be applicable over a very wide range of concentrations. A brief consideration of the effects of heterodispersity indicates that the interpretation of rms measurements is much less straightforward than in the case of monodisperse suspensions. Measurements of rms values for latex and clay suspensions are reported and the results are broadly in agreement with theoretical predictions. It is concluded that measurements of turbidity fluctuations could be a very useful means of studying aggregation and disaggregation phenomena, and could form the basis of an on-line monitoring technique.