On the design of particle filters inspired by animal noses
On the design of particle filters inspired by animal noses
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DOI：
10.1098/rsif.2021.0849
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发表时间：
2022-03-02
影响因子：
3.9
通讯作者：
Jung, Sunghwan
中科院分区：
文献类型：
--
作者：
Yuk, Jisoo;Chakraborty, Aneek;Jung, Sunghwan
被动过滤是一种常见的策略，可以减少空气传播疾病和跨越数量级的颗粒物污染物。高性能过滤器的设计具有相对较低的流动阻力，但具有较高的病毒或颗粒拦截效率，这不是一个极其相关的微不足道的问题，工业过滤系统和口罩的多样性证明了这一点。下一代工业过滤器和口罩应保留足够小的液滴和气溶胶，同时具有低阻力。受动物复杂鼻部解剖的启发，我们提出了一种新颖的3D可打印粒子过滤器。与标准的基于随机介质的过滤器不同，提出的概念依赖于具有曲折气流路径的等间距通道。这两种策略产生了截然不同的效果：阻力减小，粒子通过曲折的路径改变轨迹而被捕获的可能性很高，并导致局部流动不稳定。在不同的空气流量下，对这些结构进行了压降和颗粒过滤效率的测试。我们还通过数值模拟对观测到的效率进行了交叉验证。我们发现，与商用口罩和过滤器相比，所设计的过滤器表现出更低的压降，同时捕获大约10微米以上的颗粒。我们的发现可能促进受动物鼻子启发的新型可扩展过滤器概念的提出。
Passive filtering is a common strategy to reduce airborne disease transmission and particulate contaminants across scales spanning orders of magnitude. The engineering of high-performance filters with relatively low flow resistance but high virus- or particle-blocking efficiency is a non-trivial problem of paramount relevance, as evidenced in the variety of industrial filtration systems and face masks. Next-generation industrial filters and masks should retain sufficiently small droplets and aerosols while having low resistance. We introduce a novel 3D-printable particle filter inspired by animals' complex nasal anatomy. Unlike standard random-media-based filters, the proposed concept relies on equally spaced channels with tortuous airflow paths. These two strategies induce distinct effects: a reduced resistance and a high likelihood of particle trapping by altering their trajectories with tortuous paths and induced local flow instability. The structures are tested for pressure drop and particle filtering efficiency over different airflow rates. We have also cross-validated the observed efficiency through numerical simulations. We found that the designed filters exhibit a lower pressure drop, compared to commercial masks and filters, while capturing particles bigger than approximately 10 mu m. Our findings could facilitate a novel and scalable filter concept inspired by animal noses.