Comparative study of luminescence and chemiluminescence in hydrodynamic cavitating flows and quantitative determination of hydroxyl radicals production

Experimental evidences of radicals production by hydrodynamic cavitation: a short review

“…Similar G-values were also recorded with another opto-electronic set up and with other micro reactors (microdiaphragms and micro steps profiles) developing shear rate cavitation [38]. Recently, the chemiluminescence emitted from a larger set of microand mini hydrocavitating reactors has been investigated [40].…”

“…The measurement of chemiluminescence of luminol is now a well-established proof for hydroxyl radical production by hydrodynamic cavitation even if the number of papers dealing with luminol cavitating flows remains up to now limited. On the one hand, several experiments have been performed under moderate pressure drops through microchannels (hydrodynamic cavitation "on a chip") [37][38][39] and mini channels [40]; on the other hand, another set of experiments at macroscale and under inlet pressures up to 40 bars have been published [33,41,42].…”

“…There are five orders of magnitude between these respective G-values. The microfluidics experiments of Podbevsek et al [37,39] and of Perrin et al [38] were mainly devoted to demonstrate the effective presence of hydroxyl radicals inside cavitating flows, and they were performed just above the critical flow rate corresponding to the inception of cavitation, when the cavitating flow was not fully developed. But the recent results obtained at larger scale confirm the former G values [40].…”

Fundamentals, biomedical applications and future potential of micro-scale cavitation-a review

“…Studies addressing the luminescence of hydrodynamic cavitation in micro-scale are limited, and more research efforts are required to shed light on this field. In another study, Perrin et al 91 measured and compared luminescence of deionized water and chemiluminescence of an alkaline luminol solution for matching hydrodynamic flow regimes in a micro-step cavitating chip by a novel experimental setup capable of detecting low intensity photons inside a light tight box (Fig. 5).…”