We have performed hydrodynamic cavitation experiments with an aqueous luminol solution as the working fluid. Light emission, together with the high frequency noise which characterizes cavitation, was emitted by the two-phase flow, whereas no light emission from luminol was recorded in the single phase liquid flow. Light emission occurs downstream transparent microdiaphragms. The maximum level of the recorded signal was around 180 photons per second with flow rates of 380 µl/s, that corresponds to a real order of magnitude of the chemiluminescence of 75000 photons per second. The yield of emitted photons increases linearly with the pressure drop, which is proportional to the square of the total flow rate. Chemiluminescence of luminol is a direct and a quantitative demonstration of the presence of OH hydroxyl radicals created by hydrodynamic cavitation. The presented method could be a key to optimize channel geometry for processes where radical production is essential.

我们已经使用鲁米诺水溶液作为工作流体进行了水力空化实验。两相流发出光，并伴有表征气蚀的高频噪声，而在单相液体流中未记录到鲁米诺的发光。发光发生在下游的透明微膜片上。记录信号的最大水平约为每秒180个光子，流速为380 µl / s，对应于每秒75000个光子的化学发光的真实数量级。发射的光子的产量随压降线性增加，该压降与总流量的平方成正比。鲁米诺的化学发光是由水动力空化产生的OH羟基自由基的直接和定量证明。所提出的方法可能是为基本生产必不可少的过程优化通道几何形状的关键。