Published 12 issues per year
ISSN Print: 1044-5110
ISSN Online: 1936-2684
Indexed in
MICROSCOPIC ANALYSIS OF TRANSVERSAL AND AZIMUTHAL SURFACE DISTURBANCES OF HIGH-PRESSURE SPRAYS
ABSTRACT
A microscopic system, consisting of a transmitted light microscope and constant-pressure flow vessel, is specifically designed to enable highly resolved high-pressure primary breakup investigations at engine-like densities. At first measurements diesel and two alternative fuels are injected with a standard diesel injector at different ambient pressures. Reynolds and Ohnesorge number are varied over a wide range and several individual mechanisms are identified: an asymmetric outlet flow, the formation of sheets, ligaments, and droplets, and finally the growth of azimuthal and transversal surface disturbances. Wavelength magnitudes of transversal disturbances are in good agreement with existing analytical theories of boundary layer instabilities. Azimuthal disturbances are associated with nozzle internal cavitation. For the given high Weber number azimuthal disturbances are mainly responsible for the overall shape and subsequent breakup of the jet core.
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Kirsch Valeri, Hermans Martin, Schönberger Johannes, Ruoff Ilona, Willmann Michael, Reisgen Uwe, Kneer Reinhold, Reddemann Manuel A., Transparent high-pressure nozzles for visualization of nozzle internal and external flow phenomena, Review of Scientific Instruments, 90, 3, 2019. Crossref
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Thiebes Anja Lena, Klein Sarah, Zingsheim Jonas, Möller Georg H., Gürzing Stefanie, Reddemann Manuel A., Behbahani Mehdi, Jockenhoevel Stefan, Cornelissen Christian G., Effervescent Atomizer as Novel Cell Spray Technology to Decrease the Gas-to-Liquid Ratio, Pharmaceutics, 14, 11, 2022. Crossref