Chemistry, University of Southampton, Southampton S0171BJ, UK.
Chemistry, University of Southampton, Southampton S0171BJ, UK.
Ultrason Sonochem. 2020 Oct;67:105168. doi: 10.1016/j.ultsonch.2020.105168. Epub 2020 May 11.
The processing of oils is vital to their ultimate use within the food industry. Control over the physical properties of such materials could be achieved through the application of high-intensity ultrasound (HIU). However, the exact mechanism, centred upon acoustic cavitation, is currently unclear. To investigate the cavitation environment in oils further, the ring-up of a HIU source in an oil media is studied in the presence and absence of a pre-existing bubble population. High-speed imaging and acoustic measurements within the system is demonstrated to be extremely useful in characterising the dynamics present under non steady-state conditions. The behaviour of the clusters generated in the first 1000 ms under these conditions is shown to be significantly different depending on the bubble population. A bifurcated streamer (BiS), originating from a unique bi-cluster event, is only observable in the presence of a bubble population during the ring-up process to higher cluster orders. In addition, the lifetime of this BiS event is highly temperature dependent and is shown to be a good marker for the viscosity of the oil employed.
油的处理对于它们在食品工业中的最终用途至关重要。可以通过应用高强度超声（HIU）来控制这些材料的物理性质。然而，目前尚不清楚以空化作用为中心的确切机制。为了进一步研究油中的空化环境，研究了在存在和不存在预先存在的气泡群的情况下，在油介质中 HIUSOURCE 的振铃。该系统中的高速成像和声学测量被证明在表征非稳态条件下存在的动力学方面非常有用。在这些条件下，在前 1000ms 内生成的簇的行为根据气泡群的存在而显著不同。在振铃过程中，仅在存在气泡群的情况下，才会观察到源自独特双簇事件的分叉射流（BiS），并且可以观察到更高的簇阶。此外，该 BiS 事件的寿命高度依赖于温度，并且被证明是所使用油的粘度的良好标记。
