Print Email Facebook Twitter ElectroHydroDynamic Atomisation: Unipolar and bipolar characterisation and modelling Title ElectroHydroDynamic Atomisation: Unipolar and bipolar characterisation and modelling Author Verdoold, S. Contributor Heijnen, J.J. (promotor) Faculty Applied Sciences Department DelftChemTech / BioTechnology Date 2012-04-02 Abstract ElectroHydroDynamic Atomisation (or electrospraying) is a way to disperse a liquid into droplets by exposing it to a strong electric field. The resulting droplets are (highly) charged and can exhibit narrow size and charge distributions which is desirable for many applications. In this dissertation a novel method is developed to classify the spray mode of an electrospray system. Unlike the previously proposed classifications, this method does not require optical observations, making it ideally suited for application in larger scale systems or in systems where optical access is problematic. The efficiency of electrospraying was also determined. Although only conservative estimates of the efficiencies could be obtained, it was found that for certain spray modes the efficiency was > 1 indicating an energy increase. The second part of this thesis focuses on the optimisation of a bipolar coagulation reactor: a reactor in which (highly) charged particles with opposite polarities selectively coalesce, resulting in for example coated or reacting particles. A 2D fixed-sectional population balance model was developed to make numerical simulations of the coagulation process feasible. To optimise a bipolar coagulation reactor, a 3D grid of coupled modelling cells was used where in each individual modelling cell the coagulation behaviour was determined using the just mentioned 2D fixed-sectional population balance model. Using this approach optimisations were possible with respect to many factors like for example the relative placement of the individual nozzles or the introduction of ions at certain locations. The modelling results were qualitatively validated by combined Particle Image Velocimetry (PIV) and two-colour Laser Induced Fluorescence (LIF) measurements in a rectangular bipolar coagulation reactor. Subject EHDAElectroHydroDynamic Atomisationelectrosprayaerosolpopulation balancerenewable energybipolar coagulationPIV2-colour LIFLIFsectional modelclassificationcoagulation2D population balance To reference this document use: https://doi.org/10.4233/uuid:863b8d50-f39c-4543-8f9e-410833a1bd56 Embargo date 2012-04-02 ISBN 9789053355329 Part of collection Institutional Repository Document type doctoral thesis Rights (c) 2012 Verdoold, S. Files PDF Verdoold_-_ElectroHydroDy ... elling.pdf 46.23 MB Close viewer /islandora/object/uuid:863b8d50-f39c-4543-8f9e-410833a1bd56/datastream/OBJ/view