Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 28 for “"electrohydrodynamics"”.
-
Mathematical problems arising in interfacial electrohydrodynamics
In this work we consider the nonlinear stability of thin films in the presence of electric fields. We study a perfectly conducting thin film flow down an inclined plane in the presence of an electric field which is uniform in its undisturbed state, and normal to the plate at infinity. In addition, …
-
Computational electrohydrodynamics for fabricating polymer microstructures
The aim of the work presented in this thesis is the development of two computational models of two processes that can be used to shape molten polymers on a micro-scale, namely Electrohydrodynamic Induced Patterning (EHDIP) and Electric Field Assisted Capillarity (EFAC). These related processes both …
-
On the electrohydrodynamics of drop extraction from a conductive liquid meniscus
This thesis is concerned with the use of an electric field in the extraction of liquid drops from a capillary orifice or nozzle. The motivating application is ink jet printing. Current drop-on-demand ink jets use pressure pulses to eject drops. Literature on electrostatic spraying suggests that by …
-
The incorporation of electrohydrodynamics and other modifications into a dry spinning model to develop a theoretical framework for electrospinning
… was developed that incorporates dry spinning and electrohydrodynamics principles. The model was based on the premise that the electrospinning of polymer solutions is, in many respects, an extension of dry spinning. Dry spinning is the fiber spinning process where a polymer solution is extruded …
-
Electrospinning of polymeric nanofiber materials : process characterization and unique applications
… the electrospun fibers. This work examined the electrohydrodynamics of the electrospinning process and developed this technology for making functional materials. The first part of this dissertation deals with the electrohydrodynamics of the process. The effects of processing parameters and …
-
Electrohydrodynamic enhancement of extraterrestrial capilliary pumped loops for nuclear applications
… The work consists of a literature review of electrohydrodynamics, capillary pumped loops and space type nuclear reactors. Current CPLs are assessed for their performance and several design solutions are investigated using theoretical and analytical techniques. Experimental analysis is …
-
Electrohydrodynamic Manipulation of Sessile Droplets by the In-Plane Electric Fields
… and understanding of the physical principles of electrohydrodynamics to develop and facilitate innovative processes of painting and coating of large dielectric surface areas with less material and a higher rate; aiming at optimizing these processes and reducing final production costs. From the …
-
Computational Studies of Electrorheological Emulsions
… map. For perfect dielectric systems, where the electrohydrodynamics effects are absent, droplets form chain-like structures spanning the distance between the electrodes after the application of the electric field. Subsequently, the chains interact with each other to form columns comprising two …
-
Enhanced Ambient Heat Rejection in Passive Thermal Management Systems
… a numerical procedure is developed to solve the electrohydrodynamics. A custom-built test bench is used to validate the numerical model experimentally. It is shown that ionic wind can increase the heat removal rate by up to 100% as compared to natural convection only. The second cooling …
-
Numerical Modeling of Deformation, Oscillation, Spreading and Collision Characteristics of Droplets in an Electric Field
Electric field induced flows, or electrohydrodynamics (EHD), have been promising in many fast-growing technologies, where droplet movement and deformation can be controlled to enhance heat transfer and mass transport. Several complex EHD problems existing in many applications were investigated in …
-
An efficient heat engine for ocean thermal energy conversion
… air flow into electrical generation via coronal electrohydrodynamics, already designed but will be modeled at a future date beyond school upon advice to limit Dissertation scope. Wind blades could be used within the sustained airflow from this thermal cycle to create rotational mechanical energy …
-
Formation of polymer nanofibers from electrified fluid jets
… of the instability. To elucidate the fundamental electrohydrodynamics, glycerol was studied as a model fluid. Based on the experimental observation that whipping occurs on a length scale much larger than the jet radius, an asymptotic approximation of the electrohydrodynamic equations has been …
-
Exploratory Research on Charged Electrodes for Propulsion
The Biefeld-Brown effect has remained a mysterious physical phenomenon for nearly 100 years. It was shown in patents by its discoverer that a force exists between two highly charged electrodes which generally move towards the one of smaller physical dimensions. The system converts electrical energy …
-
Current distribution and particle motion in a barbed plate electrostatic precipitator
Electrohydrodynamic theory suggests that a modification in electrode geometry is a method of creating more favorable electrical and flow conditions in electrostatic precipitators. A novel barbed plate precipitator is designed to provide a more uniform current density distribution and electric field …
-
Alternating Current Electroosmotic Micropumping Using A Square Spiral Microelectrode Array
An alternating current electroosmotic micro pumping device has been designed, experimentally tested and theoretically analyzed using an electrohydrodynamic theoretical model applied to a computer simulation model. The device SP-1 is a microelectrode array which uses the principal of AC …
-
Electro-deformation of a moving boundary: a drop interface and a lipid bilayer membrane
This dissertation focuses on the deformation of a viscous drop and a vesicle immersed in a (leaky) dielectric fluid under an electric field. A number of mathematical tools, both analytical and numerical, are developed for these investigations. The dissertation is divided into three parts. First, a …
-
Nonlinear evolution of annular layers and liquid threads in electric fields
The nonlinear dynamics of viscous perfectly conducting liquid jets or threads under the action of a radial electric field are studied theoretically and numerically here. The field is generated by a potential difference between the jet surface and a concentrically placed electrode of given radius. A …
-
Coolant distribution control in satellite structural panels using electrohydrodynamic conduction pumping
Electrohydrodynamic (EHD) conduction pumping is well suited for pumping coolants in space-borne thermal control systems. Advantages of EHD pumps include light-weight, simple designs, no moving parts, fast response times, and low power consumption. The EHD conduction pumping phenomenon is a result …
-
Electrodeless electro hydrodynamic printing of personalized drug dosages
There is compelling evidence that variability in drug efficacy in individuals depends on their genetic fingerprints. These observations have given rise to the concept of personalized therapy whose ultimate goal is to develop medicinal agents designed for each niche of the population and individual …
-
High precision electrohydrodynamic printing of polymer onto microcantilever sensors
This thesis reports electrohydrodynamic jet printing to deposit 2 – 27 um diameter polymer droplets onto microcantilever sensors. The polymer droplets were deposited as single droplets or organized patterns, with sub-μm control over droplet diameter and position. The droplet size could be …
Page 1 of 2