Advances in ultrasonic monitoring of oil-in-water emulsions
Advances in ultrasonic monitoring of oil-in-water emulsions
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DOI：
10.1016/j.foodhyd.2013.11.019
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发表时间：
2014-12-15
影响因子：
10.7
通讯作者：
Pinfield, Valerie J.
中科院分区：
文献类型：
--
作者：
Pinfield, Valerie J.
本文对用于解释乳状液超声测量的多重散射模型进行了修正。新模型基于Luppe、Conoir和Norris（2012年）的发展，该发展考虑了热、剪切和压缩模式之间的多模式转换的影响。该模型在这里适用于水包油乳液的情况下，其中热效应占主导地位。额外的贡献表示在压缩和热模式之间的转换，反之亦然的散射系数。这些术语是由于在一个粒子处产生的热波在相邻粒子处被重新转换成压缩模式的影响。数值模拟表明，在低频率和高浓度的额外的条款是显着的向日葵油在水乳液的效果。还与实验数据进行了比较，十六烷在水中的乳液。虽然定性的协议证明，有一些定量的差异，这是由于在物理性质的不确定性，在实验数据，或在模型中所作的假设。(C)2013爱思唯尔有限公司保留所有权利。
A modification to the multiple scattering model used to interpret ultrasonic measurements for emulsions is investigated. The new model is based on a development by Luppe, Conoir, and Norris (2012) which accounts for the effects of multiple mode conversions between thermal, shear and compressional modes. The model is here applied to the case of oil in water emulsions in which thermal effects are dominant. The additional contributions are expressed in terms of the scattering coefficients for conversion between compressional and thermal modes and vice versa. These terms are due to the effect of thermal waves produced at one particle being reconverted into the compressional mode at neighboring particles. The effects are demonstrated by numerical simulations for a sunflower oil in water emulsion which show that the additional terms are significant at low frequency and high concentrations. Comparison is also made with experimental data for a hexadecane in water emulsion. Although qualitative agreement is demonstrated, there are some quantitative differences, which are attributed to uncertainties in the physical properties, in the experimental data, or in the assumptions made in the model. (C) 2013 Elsevier Ltd. All rights reserved.