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Title: Non-mechanical pumping force of electroosmosis flow and its applications in porous media
Author: Li, Bo
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2013
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The electrokinetic phenomena related to electroosmosis flow and nonmechanical forces in the micro and nano-scaled porous media have been investigated over a few years with attention on the flow pattern and micro scale application. Particularly, electroosmosis forces have been alternatively applied to create non-mechanical driving force to deliver fluids and specific mass species. In the present research work, it is aimed to examine the feasibility of scalingup a micro and nano-scale phenomena in order to employ its special flow pattern to a much larger scale application such as dehumidification industry .. The electrokinetic phenomena in microscopic world is thoroughly investigated both theoretically and experimentally. The key characteristics of electroosmosis flow is analysed based on the electric double layer (EOL) theory and its stretchy theories. Particularly, electroosmosis flow in specific geometry is investigated in micro and nanoscopic in order to command essential characters of flow for manipulating them in porous media. Therefore, the Lattice Boltzmann Method (LBM) is used on purpose to simulate electroosmosis flow in 20 porous model. It is approved that the particles size and porosity of the model play critical roles to generate electroosmosis force at interface. It also approves that electroosmosis force provides much more advantages than mechanical pumping in micro and nanoscale not only because of increasing the surface to volume ratio but also because of the simultaneous actions of all mass contents under external electric forces. The three stages experimental work demonstrates that applicable desiccant porous material has recorded electroosmosis performance in three different sized testing system. Six types of traditional solid desiccant powders from conventional dehumidification industrial applications are tested and identified on purpose in first stage measurement and selection. Then two selected desiccant are tested and compared in an optimised system. The accurate data of electroosmosis flow rate is recorded by advanced micro flow metre. Lastly, the scaling-up modules with selected desiccant material is configured into real air conditioning system for prototyping the research work. The prospects of application regarding to the energy saving and system ;1 il reliability are analysed by applying electroosmosis dehumidification unit into various locations in the real air handling units. ii
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available