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Spray performance and steadiness of an effervescent atomizer and an air-core-liquid-ring atomizer for application in spray drying processes of highly concentrated feeds

Wittner, Marc O. 1; Karbstein, Heike P. 1; Gaukel, Volker ORCID iD icon 1
1 Institut für Bio- und Lebensmitteltechnik (BLT), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Atomization for spray drying of high viscous feed liquids is still a challenging task. For this reason, we investigated the potential of two internal mixing pneumatic atomizers, namely an effervescent atomizer (EA) and an Air-Core-Liquid-Ring (ACLR) atomizer. Both atomizers are characterized by a two-phase flow in the exit orifice. While this can be either a two-phase plug or annular flow in case of the EA geometry, the ACLR atomizer enforces annular flow conditions. In this study, spraying experiments were conducted at liquid viscosities between 0.12 and 0.69 Pa∙s. The investigations were performed at a constant liquid flow rate of 20 L/h and gas pressures from 0.3 to 0.9 MPa. Besides the commonly used correlation between Gas-to-Liquid-Ratio (GLR) and time-averaged Sauter mean diameters ((SMD) ̅), we analyzed in-depth the time dependent fluctuation of SMDs, as steady atomization is crucial for spray drying applications. We can conclude that due to strong fluctuations of the SMDs the EA is not suitable for the aimed application in spray drying of high viscous feed liquids. In contrast, the ACLR atomizer is a very promising nozzle for spray drying applications as it delivers much better performance and steadiness also at high liquid viscosities.

Postprint §
DOI: 10.5445/IR/1000085846
Veröffentlicht am 01.07.2019
DOI: 10.1016/j.cep.2018.04.017
Zitationen: 14
Web of Science
Zitationen: 12
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 06.2018
Sprache Englisch
Identifikator ISSN: 0255-2701
KITopen-ID: 1000085846
Erschienen in Chemical engineering and processing
Verlag Elsevier
Band 128
Seiten 96–102
Projektinformation BMWK, EU 6. RP, 18299 N/1
Schlagwörter Spray drying; pneumatic atomization; ACLR atomizer; effervescent atomizer; high viscous feeds; highly concentrated feeds
Nachgewiesen in Dimensions
Web of Science
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