Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions.
Localization and quantification of radical production in cavitating flows with luminol chemiluminescent reactions.
复制标题
用鲁米诺荧光反应对空化流中自由基产生的定位和定量。
DOI：
10.1016/j.ultsonch.2020.105370
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发表时间：
2021-03
影响因子：
8.4
通讯作者：
Ledoux G
中科院分区：
文献类型：
--
作者：
Podbevšek D;Colombet D;Ayela F;Ledoux G
用鲁米诺荧光反应定量测定自由基产率。微流控通道中自由基产生区的定位。微尺度水力空化的线性自由基产生趋势。空化反应器优化的“原位”方法。以鲁米诺水溶液为工作流体，进行了微流控系统中的流体动力学空化实验。为了确定在哪里以及有多少活性自由基物种是由剧烈的气泡崩溃形成的，所产生的发光氧化反应的鲁米诺在微通道中的收缩下游仔细检查。一个原始的方法被开发，以映射从微流发射的化学发光的强度，使我们能够本地化的自由基产生的区域。通过激光诱导荧光实验进行的时间平均空隙率测量也被用来确定空化云的位置。结合空泡率和化学发光的二维映射表明，最大发光强度的区域被发现的下游的空化云。此外，自由基产率可以得到与我们的单光子计数技术。最大自由基产生速率为1.2 × 107 OH·/s，单位处理液体积自由基产生量为2.15 × 10 ~（10）HO·/l。所提出的技术允许在微流体流中进行自由基产生的二维表征，并且可以是一种快速、非侵入性的方式来优化水力空化反应器设计和操作参数，从而增强废水处理和其他工艺强化。
Quantization of free radical yield with luminol chemiluminescent reactions. Localization of radical producing regions in microfluidic channel. Linear radical production trends for microscale hydrodynamic cavitation. “In situ” method for cavitation reactor optimization. Hydrodynamic cavitation experiments in microfluidic systems have been performed with an aqueous solution of luminol as the working fluid. In order to identify where and how much reactive radical species are formed by the violent bubble collapse, the resulting chemiluminescent oxidation reaction of luminol was scrutinized downstream of a constriction in the microchannel. An original method was developed in order to map the intensity of chemiluminescence emitted from the micro-flow, allowing us to localize the region where radicals are produced. Time averaged void fraction measurements performed by laser induced fluorescence experiments were also used to determine the cavitation cloud position. The combination void fraction and chemiluminescence two-dimensional mapping demonstrated that the maximum chemiluminescent intensity area was found just downstream of the cavitation clouds. Furthermore, the radical yield can be obtained with our single photon counting technique. The maximum radical production rates of 1.2*107 OH•/s and radical production per processed liquid volume of 2.15*1010 HO•/l were observed. The proposed technique allows for two-dimensional characterisation of radical production in the microfluidic flow and could be a quick, non-intrusive way to optimise hydrodynamic cavitation reactor design and operating parameters, leading to enhancements in wastewater treatments and other process intensifications.