The absorption of ultrasound in emulsions: computational modelling of thermal effects.
The absorption of ultrasound in emulsions: computational modelling of thermal effects.
复制标题
DOI：
10.1038/s41598-018-30664-7
复制
发表时间：
2018-08-21
影响因子：
4.6
通讯作者：
Pinfield VJ
中科院分区：
文献类型：
--
作者：
Forrester DM;Pinfield VJ
在超声波场中，在具有对比性质的流体（例如，水中的油）中的液体颗粒周围，存在热波可以以相对高的振幅传播的小区域。在这里，我们证明了这些波形的存在和字符使用三维有限元建模的基础上线性化的Navier-Stokes方程。我们调查单个粒子和小的粒子簇，验证预期的热波长和功率耗散由于粘性和热效应周围的粒子。由于热和粘性耗散的能量损失探索作为粒子之间的平均分离距离（链接到浓度）以及所施加的频率的函数。能量损失的确定为粒子系统中衰减的计算提供了一种新的方法。我们表明，有效的衰减的乳液中存在的颗粒在集群内的颗粒间分离的影响，即使在相同的总颗粒浓度。因此，有限元建模提供了相关粒子系统中的热相互作用及其影响的证据。
Around liquid particles in a fluid of contrasting properties (for example, oil in water) in ultrasonic fields there are small regions where thermal waves can propagate with relatively high amplitudes. Herein, we demonstrate the existence and character of these waveforms using three-dimensional finite element modelling based on linearised Navier-Stokes equations. We investigate single particles and small clusters of particles, validating the expected thermal wavelength and the power dissipation due to viscous and thermal effects around the particle. The energy lost due to thermal and viscous dissipation is explored as a function of the average separation distance between the particles (linking to concentration) as well as the applied frequency. The determination of energy loss provides a new method for calculating the attenuation in particle systems. We demonstrate that the effective attenuation of an emulsion in which particles exist in clusters is influenced by the interparticle separation within the cluster, even at the same total particle concentration. Thus, the finite element modelling provides evidence for thermal interactions and their effect in correlated particle systems.
登录
查看更多内容
影响因子：
10.7
作者：
Pinfield, Valerie J.
通讯作者：
Pinfield, Valerie J.
影响因子：
2.4
作者：
AHUJA, AS;HENDEE, WR
通讯作者：
HENDEE, WR
影响因子：
4.6
作者：
Forrester DM;Pinfield VJ
通讯作者：
Pinfield VJ
影响因子：
3.9
作者：
Chanamai, R;Herrmann, N;McClements, DJ
通讯作者：
McClements, DJ
影响因子：
3.7
作者：
Forrester, Michael;Kusmartsev, Feodor;Kovacs, Endre
通讯作者：
Kovacs, Endre