Zerstäubung überhitzter Fluide - Einfluss der Durchflusscharakteristik auf das Spray

  • The scope of this work is the characterization of the process of super- heated atomization. Therefore, the flow through the nozzle is charac- terized applying Shadowgraphy, pressure measurements and mass flux measurements. The obtained results provide the basis for the resulting spray properties, which are analyzed as well. The characterization of the sprays is mostly conducted with optical measurement techniques (Shadowgraphy, Particle Image Velocimetry, Laser diffraction and Ra- man-Scattering). In addition, temperature measurements applying thermocouples and acoustical measurements for the determination of spray pulsation are conducted. The aim is a dimensionless characteri- zatThe scope of this work is the characterization of the process of super- heated atomization. Therefore, the flow through the nozzle is charac- terized applying Shadowgraphy, pressure measurements and mass flux measurements. The obtained results provide the basis for the resulting spray properties, which are analyzed as well. The characterization of the sprays is mostly conducted with optical measurement techniques (Shadowgraphy, Particle Image Velocimetry, Laser diffraction and Ra- man-Scattering). In addition, temperature measurements applying thermocouples and acoustical measurements for the determination of spray pulsation are conducted. The aim is a dimensionless characteri- zation of the whole process, including nozzle throughput and spray properties. Deionisied water as model fluid, as well as more complex fluids like polymer solutions and suspensions are atomized. In order to quantify the influence of process parameters, the liquid pressure and liquid temperature are varied. Furthermore different nozzle types are used, including hollow cone nozzles (lamella breakup) and plain orifice noz- zles (jet breakup). The geometry of the latter is varied regarding nozzle diameter, L/D-ratio, inner capillary roughness and outlet geometry. The dimensionless characterization of the superheated atomization is executed with known dimensionless numbers like the discharge coeffi- cient C D or the Pressure Number p * . Thereby it is possible to estimate the superheated throughput based on the subcooled mass flux. Fur- thermore the medium droplet size can be derived from known process parameter and mass flux values. With regard to the effectiveness, su- perheated atomization ranges in below pneumatic atomizers. Howev- er, the atomization effectiveness is only considering the droplet size as characteristic target quantity.show moreshow less

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Metadaten
Author:Astrid Günther
URN:urn:nbn:de:bvb:29-opus4-70113
Advisor:Karl-Ernst Wirth
Document Type:Doctoral Thesis
Language:German
Year of Completion:2016
Embargo Date:2016/03/21
Publishing Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Granting Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Technische Fakultät
Date of final exam:2016/03/04
Release Date:2016/04/01
SWD-Keyword:Durchströmung; Lasermesstechnik; Spray; Überhitzung
Pagenumber:323
Institutes:Technische Fakultät
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Andere Fachrichtungen der Ingenieurwissenschaften
open_access (DINI-Set):open_access
Licence (German):Creative Commons - Namensnennung-NichtKommerziell-KeineBearbeitung

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