Propulsion reversal in oscillating-bubble powered micro swimmer
Propulsion reversal in oscillating-bubble powered micro swimmer
复制标题
振荡气泡动力微型游泳器中的推进反转
DOI：
10.1088/1361-6439/ac0e7f
复制
发表时间：
2021
影响因子：
2.3
通讯作者：
Cho, Sung Kwon
中科院分区：
文献类型：
--
作者：
Liu, Fang-Wei;Zhan, Ye;Cho, Sung Kwon
气泡被捕获在一端开口的管道中，当被外部激励的声波振荡时，产生微流流动，这已被证明是水下微型机器人的有效推进力。已知推进力是管上的推力，因为微流流动从管出口流出。本文报道，这种微流流动，从而推进方向可以逆转时，气泡的气液界面暴露在管外，这是使用两种类型的管：市售的毛细管和微型聚对二甲苯管确认。这一结果意味着，在管中相对于出口的界面位置的控制是至关重要的。因此，结合两种方法来控制界面的位置，从而控制捕获气泡的长度：管出口处的颈部结构和管的等离子体处理。颈部结构使三相接触线钉扎在颈部，从而提供均匀的气泡长度和保持一致的振荡谱和推进行为。然而，由于气泡与颈部结构的界面仍然停留在管内，因此不会发生微流流动和推进的逆转。等离子体处理使得三相接触线恰好钉扎在管出口处，使得整个界面暴露于管的外部。在这种情况下，微流和推进力的逆转始终发生，这提供了控制由声学振荡气泡提供动力的微型游泳者的推进和转向的附加选项。
A gaseous bubble trapped in a one-end-open tube generates a microstreaming flow when oscillated by externally excited acoustic waves, which has been proven as an effective propulsion force for underwater micro robots. The propulsion force is known to be a pushing force on the tube since the microstreaming flow is outgoing from the tube exit. This article reports that this microstreaming flow and thus propulsion direction can be reversed when the gas–liquid interface of the bubble is exposed outside of the tube, which is confirmed using two types of tubes: commercially available capillary tubes and microfabricated parylene tubes. This result implies that control of the interface position in the tube relative to the exit is critically important. As such, two methods are incorporated to control the position of the interface and thus the length of trapped bubble: neck structure at the tube exit and plasma treatment of the tube. The neck structures enable the three-phase contact line to pin at the neck, thus providing uniform bubble lengths and warranting consistent oscillation spectra and propulsion behaviors. However, the reversal in microstreaming flow and propulsion does not occur since the bubble interface with the neck structure still stays inside the tube. The plasma treatment makes the three-phase contact line pinned right at the tube exit such that the entire interface is exposed to the outside of the tube. In this case, the reversal in microstreaming and propulsion consistently occurs, which provides an additional option to control the propulsion and steering of micro swimmers powered by acoustically oscillating bubbles.
登录
查看更多内容
使用振动气泡进行单线粒子聚焦
影响因子：
4
作者：
H. V. Phan;Muhsincan Sesen;Tuncay Alan;A. Neild
通讯作者：
A. Neild
影响因子：
4.6
作者：
Bertin, Nicolas;Spelman, Tamsin A.;Marmottant, Philippe
通讯作者：
Marmottant, Philippe
影响因子：
5.4
作者：
Louf, Jean-Francois;Bertin, Nicolas;Marmottant, Philippe
通讯作者：
Marmottant, Philippe
影响因子：
13.6
作者：
Ren, Liqiang;Nama, Nitesh;Mallouk, Thomas E.
通讯作者：
Mallouk, Thomas E.
DOI：
--
发表时间：
1959
期刊：
影响因子：
--
作者：
W. Nyborg;R. Gould;F. J. Jackson;C. E. Adams
通讯作者：
C. E. Adams