Numerical Investigation of Surface Acoustic Wave (SAW) Interacting with a Droplet for Point-of-Care Devices

IF 0.8 4区工程技术 Q4 ACOUSTICS

International Journal of Acoustics and Vibration Pub Date : 2019-12-31 DOI:10.20855/ijav.2019.24.41312

Imran Shah, E. Uddin, A. Mubashar, M. Younis, Hudair Samad, K. Choi

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引用次数: 2

Abstract

A three-dimensional numerical simulation of the interaction of a surface acoustic wave (SAW) with a droplet of water is carried out. The mixing produced inside the droplet due to the incident with the SAW and the droplet is investigated by undertaking a parametric study, with parameters such as frequency, drop size, and the lateral position of the droplet on the surface of the substrate. The linear relationship between the input voltage and the mixing velocity inside the droplet is obtained with variation of the input voltage of the inter-digital transducer (IDT) of the SAW device within a 10–40 V range. With the variation in frequency, the maximum mixing velocity is observed at 20 MHz and it appears to be independent of the size of the droplet. Varying the substrate material with lead zirconate titanate and lithium niobate produces better mixing. Lithium niobate is preferred due to its availability and cost-effectiveness. A drop of 600 μm diameter produces better mixing. The different velocities inside the drop and the SAW device are obtained by changing the droplet position in the lateral direction (asymmetrical position) from the centre of the substrate. Cut planes parallel and perpendicular to the SAW at the core of a half-spherical droplet are observed to visualise the mixing effects inside the droplet during the interaction. To achieve the best mixing criteria, the droplet is moved in a lateral direction. An efficient parametric design for the mixing phenomena in micro-fluidic devices is presented for point-of-care devices.

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表面声波（SAW）与护理点设备液滴相互作用的数值研究

对表面声波（SAW）与水滴的相互作用进行了三维数值模拟。通过进行参数研究，研究由于SAW和液滴的入射而在液滴内部产生的混合，参数包括频率、液滴尺寸和液滴在基板表面上的横向位置。输入电压和液滴内混合速度之间的线性关系是随着SAW器件的数字间换能器（IDT）的输入电压在10–40 V范围内的变化而获得的。随着频率的变化，在20MHz处观察到最大混合速度，并且它似乎与液滴的大小无关。用锆钛酸铅和铌酸锂改变基底材料可以产生更好的混合。铌酸锂是首选，因为它的可用性和成本效益。直径为600μm的液滴可产生更好的混合效果。液滴和SAW器件内部的不同速度是通过从衬底中心在横向方向（不对称位置）上改变液滴位置而获得的。在半球形液滴的核心观察平行和垂直于SAW的切割平面，以可视化相互作用过程中液滴内部的混合效应。为了达到最佳混合标准，液滴在横向方向上移动。针对护理点设备中的微流体设备中的混合现象，提出了一种有效的参数设计方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Acoustics and Vibration ACOUSTICS-ENGINEERING, MECHANICAL

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

12 months

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