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• W2890887822 abstract "This thesis provides a general description ofmicro droplet generation at low and medium Weber numbers usinganalytical, numerical and experimental methods in an engineeringmanner of contemplation. Based on the presented results guidelinesare deduced to support the designing and operating any type ofmicro droplet generator. In the first chapter the basicdifferential equations are presented which are relevant for thedroplet formation in the micro scale. Based on these fundamentalsanalytical and numerical descriptions of the droplet formationprocess will be discussed throughout the thesis. Importantdimensionless numbers like the Reynolds, the Weber and theOhnesorge number are introduced to describe the fluid flow in microdimensions and the droplet formation qualitatively. Simpleanalytical expressions are derived for fluidic components likefluidic resistance, fluidic inertance, fluidic capacitance, anoutflow model of a nozzle, an inlet resistance and junction effectslike a contraction or an expansion of the cross section. Suchcompact models can be applied to build equivalent fluidic networksfor more complicated fluidic systems. In this work some of theconsidered droplet generators are described by such a networkapproach. The main part of the work is engaged with thefundamentals of droplet formation especially with the necessarycriteria for a droplet ejection. Therefore the Weber numberrespectively the critical Weber number is used to derive sufficientcritical parameters for the droplet formation like the criticalvelocity, the critical pressure, the critical time and the criticalpower. These parameters are introduced using an energetic approachbased on the formulations stated in the previous chapter. Thesecritical values are subsequently used to describe the sufficientboundary conditions for a successful droplet generation with agiven setup. Moreover these critical values can also be used todepict the influence of the design and geometrical variations orparameter variations of the applied liquid. Since the energeticmodel is not capable to state the dynamic behavior of a givensystem it is complemented by a computational fluid dynamics (CFD)study concerning the dependence of the droplet formation process onthe actuation dynamics. The role of the critical values issuccessfully validated using the CFD model. Based on this parametermaps for successful droplet generation in different dropletgeneration regimes like drop-on-demand, jet-on-demand or a jetejection with subsequent Rayleigh breakup are presented. Finally anew, unique classification of the various droplet generationmechanisms known today is proposed. This classification is based onthe underlying fluid dynamic working principle rather than onobvious design elements of the system or historicalreasons. As a prominent example of a droplet generator abubble jet printhead design provided by Olivetti I-Jet was studiedintensively. This work was carried out within an European projectsupported by the Federal Ministry…" @default.
• W2890887822 created "2018-09-27" @default.
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• W2890887822 date "2006-01-01" @default.
• W2890887822 modified "2023-09-23" @default.
• W2890887822 title "Dropletgeneration - from the nanoliter to the femtoliter range" @default.
• W2890887822 hasPublicationYear "2006" @default.
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