Synchrotron-based radioscopy employing spatio-temporal micro-resolution for studying fast phenomena in liquid metal foams.
Synchrotron-based radioscopy employing spatio-temporal micro-resolution for studying fast phenomena in liquid metal foams.
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DOI：
10.1107/s0909049509001939
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发表时间：
2009-05
影响因子：
2.5
通讯作者：
Banhart J
中科院分区：
文献类型：
--
作者：
Rack A;García-Moreno F;Baumbach T;Banhart J
应用基于高速同步辐射的射线透视技术研究了液态泡沫金属中的聚结过程（持续时间为1.2 ms）。 本文报道了用X射线透视法研究膨胀液态泡沫金属中孔的合并和单个孔壁的坍塌。通过使用白色同步辐射进行成像，可以以40000帧s-1（25 µs曝光时间）的时间采样率和20 µm的空间采样率记录膜的破裂和随后的两个相邻气泡的合并。 发现细胞壁的破裂时间在300 µs的范围内。 该值与假设液体金属泡沫中的孔壁的惯性主导的破裂时间的理论考虑一致。
High-speed synchrotron-based radioscopy is applied to study a coalescence event (which lasts ∼2 ms) in situ in a liquid metal foam. Investigations of pore coalescence and individual cell wall collapse in an expanding liquid metal foam by means of X-ray radioscopy with spatio-temporal micro-resolution are reported. By using white synchrotron radiation for imaging, the rupture of a film and the subsequent merger of two neighbouring bubbles could be recorded with a time sampling rate of 40000 frames s−1 (25 µs exposure time) and a spatial sampling rate of 20 µm. The rupture time of a cell wall was found to be in the range of 300 µs. This value is in agreement with theoretical considerations which assume an inertia-dominated rupture time of cell walls in liquid metal foams.