A metamaterial-free fluid-flow cloak  

作　　者：Fuyang Tay Youming Zhang Hongyi Xu Honghui Goh Yu Luo Baile Zhang 

机构地区：[1]Division of Physics and Applied Physics,School of Physical and Mathematical Sciences,Nanyang Technological University,Singapore 637371,Singapore [2]School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore [3]Centre for Disruptive Photonic Technologies,Nanyang Technological UniversitySingapore 637371,Singapore

出　　处：《National Science Review》2022年第9期207-213,共7页国家科学评论（英文版）

基　　金：supported by the Singapore Ministry of Education(MOE2018-T2-2-189(S),MOE2018-T2-1-022(S),MOE2016-T3-1-006 and RG174/16(S));the A*Star Advanced Manufacturing and Engineering(AME)Individual Research Grants(IRG)(A20E5c0095);the Programmatic Funds(A18A7b0058);the National Research Foundation Singapore Competitive Research Program(NRF-CRP22-2019-0006 and NRF-CRP23-2019-0007)。

摘　　要：The model of ide al fluid flow around a cylindrical obstacle exhibits a long-established physical picture,where originally straight streamlines are deflected over the whole space by the obstacle.Inspired by transformation optics and metamaterials,recent theories have proposed the concept of fluid cloaking,which is able to recover the straight streamlines,as if the obstacle did not exist.However,such a cloak,similar to all previous transformation-optics-based devices,relies on complex metamaterials with inhomogeneous parameters and is difficult to implement.Here we deploy the theory of scattering cancellation and report on the experimental realization of a fluid-flow cloak without metamaterials.This clo ak is realized by engineering the geometry of the fluid channel,which effectively cancels the dipole-like scattering of the obstacle.The clo aking effect is demonstrated through the direct observation of recovered straight streamlines in the fluid flow.Our work sheds new light on conventional fluid control and may find application in microfluidic devices.

关 键 词：invisibility cloaks METAMATERIALS fluid-flow control 

分 类 号：O35[理学—流体力学]