Mechanics of removing water from the ear canal: Rayleigh–Taylor instability

Mechanics of removing water from the ear canal: Rayleigh–Taylor instability
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从耳道去除水分的机制:瑞利泰勒不稳定性

DOI:
10.1017/jfm.2023.309
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发表时间:
2023
影响因子:
3.7
通讯作者:
Jung, Sunghwan
Jung, Sunghwan
中科院分区:
工程技术2区
文献类型:
--
作者:
Kim, Seungho;Baskota, Anuj;Kang, Hosung;Jung, Sunghwan

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水卡在耳朵里是洗澡、游泳或其他水上活动时的常见问题。水长时间滞留在耳道中会导致耳部感染,并可能导致听力损失。从耳道中排出水的常见策略是摇头,其中高加速度有助于去除水。在本研究中,我们合理化的基本机制,水喷射/从耳道中去除进行实验和发展的稳定性理论。从实验中,我们测量了临界加速度,以消除被困在不同尺寸的渠道内的水。我们的理论模型,从瑞利-泰勒不稳定性修改,可以解释在实验中观察到的临界加速度,这强烈依赖于耳道的半径。由此产生的临界加速度往往会增加,特别是在较小的耳道中,这表明摇头以去除水可能更费力,并且由于与成人相比,儿童的耳道尺寸较小,因此对儿童有潜在的威胁。
Water stuck in the ear is a common problem during showering, swimming or other water activities. Having water trapped in the ear canal for a long time can lead to ear infections and possibly result in hearing loss. A common strategy for emptying water from the ear canal is to shake the head, where high acceleration helps remove the water. In this present study, we rationalize the underlying mechanism of water ejection/removal from the ear canal by performing experiments and developing a stability theory. From the experiments, we measure the critical acceleration to remove the trapped water inside different sizes of canals. Our theoretical model, modified from the Rayleigh–Taylor instability, can explain the critical acceleration observed in experiments, which strongly depends on the radius of the ear canal. The resulting critical acceleration tends to increase, especially in smaller ear canals, which indicates that shaking heads for water removal can be more laborious and potentially threatening to children due to their small size of the ear canal compared with adults.
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