2020 年 37 巻 2 号 p. 370201-
A better understanding on the transport phenomena, momentum (flow), heat, and mass transfer of acoustically levitated droplets is very important for several scientific and industrial fields. The flow generated by a nonlinear acoustic field is known as acoustic streaming. In acoustic levitation, multiscale acoustic streaming can be induced both inside and outside the droplet. In the internal flow field, the streaming configuration is affected by the physical properties of the droplet. The external flow field can be characterized by the applied sound pressure, physical properties of the droplet, and surrounding gas. These flow fields are instrumental in the heat and mass transfer of the levitated droplet. This review provides a recent advancement on the flow fields, heat, and mass transfer enhancement of the acoustically levitated droplet.