Applications of Acoustic Streaming - Developing a fundamental understanding of acoustic streaming and its use for flow manipulation and control.

戴森以其流量控制技术而闻名，无论是在密闭空间(通过真空吸尘器的空气流动)还是在开放空间(房间内的空气净化)。为了保持市场领先地位，戴森必须通过投资研究来开发新技术。这个为期4年的项目的目的是发展一个基本的了解用于流动操作和控制应用的声流。声流是由于高压声波与流体介质的非线性相互作用而在流体中产生流场的一种现象。它是构成声反射(声音产生的力)的两种非线性现象之一，另一种是声辐射力。联合国开发计划署小组在利用超声波利用声辐射力操纵颗粒方面进行了广泛的研究。该项目将通过纳入声波流动建立在这一知识的基础上，特别是通过发展对声音驱动流动、固体表面和流体如何相互作用的理解。声流的控制方程将用于对完全耦合的声/流系统进行多物理模拟，并将通过实验进行验证。我将与戴森的空气声学研究小组合作，在那里我将不得不传播在研究过程中发展起来的知识，用于未来技术和产品的开发。将有机会在戴森工作，并使用他们最先进的实验室和原型设施。

Dyson is well known for its flow control technology, both in confined (air flow through a vacuum cleaner) and open (air purification in a room) spaces. To maintain a market leading position, Dyson must develop new technology through investment in research. The purpose of this 4 year project is to develop a fundamental understanding of acoustic streaming for use in flow manipulation and control applications. Acoustic streaming is a phenomenon whereby a flow field is generated in a fluid as a result of the nonlinear interaction of a high pressure acoustic wave with the fluid medium. It is one of the two nonlinear phenomena that make up acoustophoresis (forces generated with sound), the other being the acoustic radiation force. The UNDT group have conducted extensive research in the use of ultrasound for manipulating particles using the acoustic radiation force. The project will build on this knowledge by incorporating acoustic streaming, specifically by developing an understanding of how acoustic driven streaming, solid surfaces and fluid flow interact with each other. The governing equations of acoustic streaming will be used to conduct multiphysics modelling of a fully coupled acoustic/flow system, and the work will be validated through experiment. I will work with the aeroacoustic research group at Dyson, where I will have to disseminate knowledge developed during the course of the research to be used for the development of future technology and products. There will be opportunities to work at Dyson and to use their state-of-the-art laboratory and prototyping facilities.