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arXiv 1303.4872physics.flu-dynphysics.space-ph
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寻找最球形的气泡

The Quest for the Most Spherical Bubble

Danail Obreschkow, Marc Tinguely, Nicolas Dorsaz, Philippe Kobel, Aurele de Bosset, Mohamed Farhat

摘要:

我们描述了一个最近实现的实验产生最球形空化气泡今天。这些气泡是由纳秒激光脉冲产生的点等离子体在液体中生长而成的。与以前的研究不同,激光由一个抛物柱面镜聚焦,产生了前所未有的对称性等离子体。随后的气泡是足够球形的,由重力引起的静水压力梯度成为空化气泡的塌陷和反弹中的不对称性的主要来源。为了避免这种不对称的自然来源,整个实验因此在微重力条件下进行(欧空局,第53次和第56次抛物线飞行活动)。在微重力(~ 0 g)下观察到空泡,空泡的塌陷和反弹保持球形,在正常重力(1 g)至超重力(1.8 g)下观察到空泡,出现重力驱动的射流。在这里,我们描述了实验装置和技术结果,并概述了科学数据。在线发布了一系列高质量的阴影电影和时间分辨压力数据。

英文摘要:

We describe a recently realized experiment producing the most spherical cavitation bubbles today. The bubbles grow inside a liquid from a point-plasma generated by a nanosecond laser pulse. Unlike in previous studies, the laser is focussed by a parabolic mirror, resulting in a plasma of unprecedented symmetry. The ensuing bubbles are sufficiently spherical that the hydrostatic pressure gradient caused by gravity becomes the dominant source of asymmetry in the collapse and rebound of the cavitation bubbles. To avoid this natural source of asymmetry, the whole experiment is therefore performed in microgravity conditions (ESA, 53rd and 56th parabolic flight campaign). Cavitation bubbles were observed in microgravity (~0g), where their collapse and rebound remain spherical, and in normal gravity (1g) to hyper-gravity (1.8g), where a gravity-driven jet appears. Here, we describe the experimental setup and technical results, and overview the science data. A selection of high-quality shadowgraphy movies and time-resolved pressure data is published online.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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