Experimental study of the thermal behavior of spark generated bubbles in water
Experimental study of the thermal behavior of spark generated bubbles in water
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DOI：
10.1016/j.expthermflusci.2013.07.004
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发表时间：
2013-11
影响因子：
3.2
通讯作者：
K. Vokurka;J. Plocek
中科院分区：
文献类型：
--
作者：
K. Vokurka;J. Plocek
本文利用光电二极管和声学传感器对电火花气泡的热行为进行了实验研究。结果表明，在整个第一次气泡振荡过程中，气泡内部都存在等离子体。使用一种简单的方法，基于几个假设，它允许确定辐射的光能的估计，并从它的表面温度的气泡时，热辐射达到其最大值。然后，在计算许多其他量时，可以利用这个温度。给出了在第一气泡生长阶段和在第一压缩和随后的膨胀阶段中的能量分配的例子。当气泡被压缩到其第一个最小体积的表面等离子体温度的估计也被给出，它已被发现在选定的实验中约为5900 K。它还表明，火花产生的气泡不表现出的行为，在气泡内部的等离子体代表一个高度非均匀的介质远离平衡状态，对于其中的状态方程的理想气体不能使用。
In the paper thermal behavior of spark generated bubbles is studied experimentally using an optic sensor (a photodiode) and an acoustic sensor (a hydrophone). It is shown that there is plasma in the bubble interior during the whole first bubble oscillation. A simple method is used, based on several assumptions, which allows determining an estimate of the radiated optic energy and from it the surface temperature of the bubble when the thermal radiation reaches its maximum. This temperature can be then exploited when computing a number of other quantities. An example of the energy partition in the first bubble growth phase and in the first compression and the following expansion phases is given. The estimate of the surface plasma temperature when the bubble is compressed to its first minimum volume is also given and it has been found to be approximately 5900 K in a selected experiment. It is also shown that spark generated bubbles do not behave adiabatically and that the plasma in the bubble interior represents a highly non-homogeneous medium far from an equilibrium state, for which the equation of the state of an ideal gas cannot be used.