共查询到17条相似文献,搜索用时 62 毫秒
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1 引言 自从发现单气泡声致发光 (SBSL )的现象 [1] 至今 ,已经有一些模型解释发光的机理 ,其中最有影响的冲击波 -部分等离子体 -韧致辐射的模型。最近有些人倾向于认为 [2 ] ,发光可能不是来自于气泡中心部位高温小区域 ,因为这个区域对应高温的时间太短 ,气体太少。为了弄清气泡内气体电离度的分布 ,从而了解气泡发光机制 ,本文利用简单的电离冷却机制 ,计算气泡内对应于不同表面张力的电子浓度分布。取不同表面张力系数是因为在用 Rayleigh-Plesset[3 ] 方程拟合气泡运动的半径时 ,比较好的结果都是取水的表面张力系数为 50 dyn/… 相似文献
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S. Sh. Rekhviashvili 《Technical Physics Letters》2008,34(12):1072-1074
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Experimental data indicative of a correlation between the sonoluminescence (SL) intensities at different points of a vessel with a liquid are reported. The SL disappears ~0.1 s after switching off the ultrasonic generator, whereas the liquid conductivity remains the same for several minutes. Thus, the presence of ions in the liquid is not the only cause of the SL. 相似文献
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Experimental results are presented to show that multibubble sonoluminescence is accompanied by the formation of an electric double layer on an ultrasonic waveguide. 相似文献
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A single bubble trapped at an antinode of an acoustic standing wave field in water can emit 50ps-140ps light pulses, called "single bubble sonoluminescence" (SBSL). It arouses much interest in physical acoustics because of its highly non-linear characteristics, high concentration of energy, and stable cavitation behavior. In this paper, bubble stability, the dynamic behavior of bubbles, non-invasive measurement of driving acoustic pressure and Mie scattering method are introduced. 相似文献
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N. V. Dezhkunov 《Technical Physics Letters》2008,34(4):346-349
A phenomenological rule establishing a relationship between the cavitation threshold and the maximum intensity of sonoluminescence (SL) induced by ultrasound is formulated on the basis of experimental data for various liquid media. According to this, the maximum SL intensity attained by varying the intensity of ultrasound within broad limits is always greater in a medium characterized by a higher cavitation threshold. 相似文献