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Spraying of viscous liquids: Influence of fluid-mixing mechanism on the performance of internal-mixing twin-fluid atomizers

Mlkvik, M.; Jedelsky, J.; Karbstein, H. P.; Gaukel, V.

Abstract:
The thermal usage of liquid fuels implies their combustion, which is a process strongly influenced by the performance of the atomizer, which disrupts the fuel into drops of the required sizes. The spray quality of the twin-fluid atomizers with internal mixing (IM-TFA) is primarily influenced by the two-phase flow pattern inside the mixing chamber. We studied the performance of the four types of the IM-TFA nozzles by the optical diffraction system (Malvern Spraytec) to answer the question of how the mixing chamber design influences the spray quality at low atomizing gas consumption. We tested the effervescent atomizer in outside-in-liquid (OIL) and outside-in-gas (OIG) configurations, the Y-jet nozzle and new nozzle design, and the CFT atomizer when spraying model liquids with the viscosities comparable to the common fuels (μ=60and143 mPa⋅ s). We found that the effervescent atomizer performance was strongly influenced by the configuration of the inlet ports. Although the OIL configuration provided the best spray quality (D$_{32}$ = 72 μm), with the highest efficiency (0.16%), the OIG nozzle was characterized by unstable work and poor spray quality. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123603
Veröffentlicht am 27.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 30.07.2020
Sprache Englisch
Identifikator ISSN: 2076-3417
KITopen-ID: 1000123603
Erschienen in Applied Sciences
Band 10
Heft 15
Seiten Art. Nr.: 2818
Schlagwörter liquid atomization, twin-fluid nozzle, atomization efficiency, two-phase flows, spray quality
Nachgewiesen in Scopus
Web of Science
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