Ibanez Ruy, Raghunandan Aditya, Kelley Douglas H
Department of Mechanical Engineering, University of Rochester, New York 14627, USA.
Phys Rev Fluids. 2023;8(11). doi: 10.1103/physrevfluids.8.113101. Epub 2023 Nov 9.
In this study, we leverage geometry-induced asymmetries to rectify oscillatory flows and induce net directional transport of fluid in a looped network. We demonstrate this valveless rectification phenomenon in an experimental apparatus that consists of an acrylic flow chamber with a deformable wall connected to a syringe pump via a T-junction. Here, oscillatory flows were forced by the syringe pump. We found that the asymmetries that existed in the geometric configuration of the looped channel could be exploited to generate net directional flow and that this geometric configuration is key in determining the directionality. By varying the pumping parameters in the system, we determined a relationship between the frequency and stroke length of the forcing syringe pump and the resulting directional flow in the loop. Using an analytical model and flow computations, we posit how asymmetric flow separation occurring at the T-junction could explain the observed flows.
在本研究中，我们利用几何结构引起的不对称性来纠正振荡流，并在环形网络中诱导流体的净定向传输。我们在一个实验装置中展示了这种无阀整流现象，该装置由一个丙烯酸流动腔室组成，其具有一个通过T型接头连接到注射泵的可变形壁。在这里，振荡流由注射泵驱动。我们发现，环形通道几何结构中存在的不对称性可被用来产生净定向流，并且这种几何结构是决定方向性的关键因素。通过改变系统中的泵送参数，我们确定了驱动注射泵的频率和冲程长度与环形回路中产生的定向流之间的关系。使用解析模型和流动计算，我们推测在T型接头处发生的不对称流动分离如何解释观察到的流动。
