subject:(Corona discharges)

University of Notre Dame

1. Rakshit Tirumala. Corona Discharges in Asymmetric Electric Fields and its Impact on Ionic Wind Generation</h1>.

Degree: PhD, Aerospace and Mechanical Engineering, 2013, University of Notre Dame

URL: https://curate.nd.edu/show/qv33rv06f77

► The challenge of thermal management in small form-factor electronic devices drives the development of novel technologies for heat dissipation. Ionic wind devices, which operate… (more)

▼ The challenge of thermal management in small form-factor electronic devices drives the development of novel technologies for heat dissipation. Ionic wind devices, which operate on the principle of electrohydrodynamic interaction, are being studied as a replacement for conventional fans because of the inherent advantages of small acoustic signature, low weight, low power consumption, and the absence of moving parts. In particular, corona discharge driven ionic winds are favored for their ease of operation in direct current (DC) mode and stability at atmospheric pressures. Miniaturization of ionic wind blowers to extremely small form factors (heights < 3 mm) is accompanied by various challenges. The operating potentials too are constrained to ~2000V to minimize safety hazards. To obtain flow rates comparable to fans under such constraints necessitates development of novel configurations and new modes of operation. This dissertation presents a multi-electrode corona discharge as a solution to the challenges arising from miniaturization of duct heights in ionic wind devices. An overview of fundamentals of corona discharges and ionic winds, and a literature survey of various ionic wind devices and numerical modeling procedures is included. Data from preliminary experiments on sub-millimeter scale coronas is presented and compared to theory to study the limiting conditions for corona formation and sustenance. Corona discharges are studied experimentally and numerically in configurations that induce asymmetric electric fields in the discharge space. Multiple collector configurations are a particular subset of these and are studied in more detail to characterize their fundamental behavior and to understand the differences from traditional discharges involving a single collecting electrode. The configurations are shown to present characteristics that are suitable for mitigating some of the problems encountered in device miniaturization. The three-electrode configurations are shown to reduce the onset potentials for device operation, increase the total current production, and present a favorable redistribution of current to the various collectors. Traditional corona modeling procedures are demonstrated to have significant shortcomings in asymmetric configurations and an alternative modeling procedure is developed for application in these conditions. The multi-electrode configurations were adapted to the development of an ionic wind blower. In a laboratory setup, these configurations are shown to improve flow rates by a factor of ~3x and reduce power consumption by up to 0.5x. A prototype fabricated within the constraints imposed by handheld electronic systems on size and operating potential is described. The performance of the prototype-installed system is compared to the baseline system for flow and acoustic characteristics and is shown to be comparable in terms of the flow rates generated and significantly better in the acoustic signature levels. Advisors/Committee Members: Dr. Hsueh-Chia Chang, Committee Member, Dr. David Go, Committee Chair, Dr. Patrick Dunn, Committee Member, Dr. Gretar Tryggvason, Committee Member.

Subjects/Keywords: corona; plasma; ionic wind; gas discharges; electrohydrodynamic

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APA (6^th Edition):

Tirumala, R. (2013). Corona Discharges in Asymmetric Electric Fields and its Impact on Ionic Wind Generation</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/qv33rv06f77

Chicago Manual of Style (16^th Edition):

Tirumala, Rakshit. “Corona Discharges in Asymmetric Electric Fields and its Impact on Ionic Wind Generation</h1>.” 2013. Doctoral Dissertation, University of Notre Dame. Accessed December 10, 2019. https://curate.nd.edu/show/qv33rv06f77.

MLA Handbook (7^th Edition):

Tirumala, Rakshit. “Corona Discharges in Asymmetric Electric Fields and its Impact on Ionic Wind Generation</h1>.” 2013. Web. 10 Dec 2019.

Vancouver:

Tirumala R. Corona Discharges in Asymmetric Electric Fields and its Impact on Ionic Wind Generation</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2013. [cited 2019 Dec 10]. Available from: https://curate.nd.edu/show/qv33rv06f77.

Council of Science Editors:

Tirumala R. Corona Discharges in Asymmetric Electric Fields and its Impact on Ionic Wind Generation</h1>. [Doctoral Dissertation]. University of Notre Dame; 2013. Available from: https://curate.nd.edu/show/qv33rv06f77

University of Manchester

2. Da Silva domingues, Elizabeth. Improved Condition Monitoring of Composite Insulators.

Degree: 2012, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246

► Although the cost of investment in power lines insulators is 3 - 5% of the total cost of the installation, the impact of their performance… (more)

▼ Although the cost of investment in power lines insulators is 3 - 5% of the total cost of the installation, the impact of their performance on reliability, failure costs, maintenance routines, etc in power systems is tens of times higher. Composite insulators were introduced 50 years ago and have been used around the world with consistently good experience. Low weight, easy handling, good performance under high pollution, low maintenance costs, and resistance to vandalism are some of their advantages. Nevertheless, acid rain, salty dust deposition, corona discharges, ozone, UV radiation, and humidity among other factors, deteriorate the quality of the polymeric housing reducing their hydrophobicity. The synergistic action of ageing factors is extremely complex and the whole degradation process may change when any one variable is slightly modified. Many studies have been carried out to increase understanding of the physicochemical processes which control the electrical and mechanical stability of polymers during in-service ageing with the objective of predicting remaining life-times. Vital areas of knowledge about polymer insulators are still incomplete and lacking; three of them are: (1) early stages of degradation in service under different environmental conditions, (2) monitoring and diagnosis techniques suitable for distribution installations and (3) steps to establish an insulators management plan based on condition and risk of failure.In this research these three topics are covered. A full review of literature about management of electrical distribution assets is included, followed by a specific plan developed for monitoring, diagnosis and ranking of insulators mainly supported by visual inspections. Diagnosis of medium voltages EPDM insulators recovered from service aged under different conditions is done using both traditional techniques and, uniquely, dielectric impedance. The relationship between surface roughness and static contact angle is also used to characterize insulators’ surfaces. Early stages of degradation are studied focusing the experimental work to evaluate the electrohydrodynamic processes which occur on new samples under different conditions, giving special attention to leakage current pulse analysis, electric field enhancement, and resistance/capacitive behaviour including phase of leakage current. Results from each specific topic offer additional understanding of polymer insulators degradation providing insight to monitoring, diagnosis and management. Additionally, results open new topics in which new investigations are proposed. Advisors/Committee Members: Rowland, Simon.

Subjects/Keywords: composite insulators; ageing; early stages; water droplets; electric field; corona discharges

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Da Silva domingues, E. (2012). Improved Condition Monitoring of Composite Insulators. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246

Chicago Manual of Style (16^th Edition):

Da Silva domingues, Elizabeth. “Improved Condition Monitoring of Composite Insulators.” 2012. Doctoral Dissertation, University of Manchester. Accessed December 10, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246.

MLA Handbook (7^th Edition):

Da Silva domingues, Elizabeth. “Improved Condition Monitoring of Composite Insulators.” 2012. Web. 10 Dec 2019.

Vancouver:

Da Silva domingues E. Improved Condition Monitoring of Composite Insulators. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2019 Dec 10]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246.

Council of Science Editors:

Da Silva domingues E. Improved Condition Monitoring of Composite Insulators. [Doctoral Dissertation]. University of Manchester; 2012. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:156246

Arizona State University

3. Sangaraju Venkateshwara, Pradeep Varma. Thermal Degradation In Composite Insulation Due To Corona Discharges.

Degree: MS, Electrical Engineering, 2010, Arizona State University

URL: http://repository.asu.edu/items/8810

► Composite insulators on overhead lines are frequently subjected to corona discharges due to increased electric field intensities under various conditions. These discharges can cause localized… (more)

▼ Composite insulators on overhead lines are frequently subjected to corona discharges due to increased electric field intensities under various conditions. These discharges can cause localized heating on the surface and affect the hydrophobicity of the insulator. A study has been undertaken to quantify and evaluate the thermal degradation that composite insulation is subjected to from corona discharges. This has been conducted primarily at the power frequency (60 Hz) and at the low frequency range (37 kHz). Point to plane corona discharge experiments have been performed in the laboratory at both the frequencies and varying levels of thermal degradation has been observed. The amplitude and the frequency of current spikes have been recorded at different voltage levels. A temperature model based on the amplitude and the frequency of current data has been formulated to calculate the maximum temperature attained due to these discharges. Visual thermal degradation has been found to set in at a low frequency range while there is no visual degradation observed at power frequency even when exposed to discharges for relatively much longer periods of time. However, microscopic experiments have been conducted which revealed degradation on the surface at 60 Hz. It has also been found that temperatures in excess of 300 Celsius have been obtained at 37 kHz. This corroborates the thermo gravimetric analysis data that proves thermal degradation in silicone rubber samples at temperatures greater than 300 Celsius. Using the above model, the maximum temperature rise can be evaluated due to discharges occurring on high voltage insulation. This model has also been used to calculate the temperature rise on medium voltage distribution equipment such as composite bushings and stand-off plugs. The samples were subjected to standard partial discharge tests and the corresponding discharge magnitudes have been recorded. The samples passed the tests and the corresponding temperatures plotted have been found to be within thermal limits of the respective insulation used on the samples. The experimental results concur with the theoretical model. A knowledge of the maximum temperatures attained due to these discharges can help in design of insulation with better thermal properties.

Subjects/Keywords: Electrical Engineering; Energy; Engineering; Composite insulation; Corona; Degradation; non-ceramic; Partial discharges; Thermal

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Sangaraju Venkateshwara, P. V. (2010). Thermal Degradation In Composite Insulation Due To Corona Discharges. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/8810

Chicago Manual of Style (16^th Edition):

Sangaraju Venkateshwara, Pradeep Varma. “Thermal Degradation In Composite Insulation Due To Corona Discharges.” 2010. Masters Thesis, Arizona State University. Accessed December 10, 2019. http://repository.asu.edu/items/8810.

MLA Handbook (7^th Edition):

Sangaraju Venkateshwara, Pradeep Varma. “Thermal Degradation In Composite Insulation Due To Corona Discharges.” 2010. Web. 10 Dec 2019.

Vancouver:

Sangaraju Venkateshwara PV. Thermal Degradation In Composite Insulation Due To Corona Discharges. [Internet] [Masters thesis]. Arizona State University; 2010. [cited 2019 Dec 10]. Available from: http://repository.asu.edu/items/8810.

Council of Science Editors:

Sangaraju Venkateshwara PV. Thermal Degradation In Composite Insulation Due To Corona Discharges. [Masters Thesis]. Arizona State University; 2010. Available from: http://repository.asu.edu/items/8810

University of Manchester

4. Da Silva domingues, Elizabeth. Improved condition monitoring of composite insulators.

Degree: PhD, 2012, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/improved-condition-monitoring-of-composite-insulators(d42e15fb-d9c2-4e45-94b9-3321e9d9b9f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553396

► Although the cost of investment in power lines insulators is 3-5% of the total cost of the installation, the impact of their performance on reliability,… (more)

▼ Although the cost of investment in power lines insulators is 3-5% of the total cost of the installation, the impact of their performance on reliability, failure costs, maintenance routines, etc in power systems is tens of times higher. Composite insulators were introduced 50 years ago and have been used around the world with consistently good experience. Low weight, easy handling, good performance under high pollution, low maintenance costs, and resistance to vandalism are some of their advantages. Nevertheless, acid rain, salty dust deposition, corona discharges, ozone, UV radiation, and humidity among other factors, deteriorate the quality of the polymeric housing reducing their hydrophobicity. The synergistic action of ageing factors is extremely complex and the whole degradation process may change when any one variable is slightly modified. Many studies have been carried out to increase understanding of the physicochemical processes which control the electrical and mechanical stability of polymers during in-service ageing with the objective of predicting remaining life-times. Vital areas of knowledge about polymer insulators are still incomplete and lacking; three of them are: (1) early stages of degradation in service under different environmental conditions, (2) monitoring and diagnosis techniques suitable for distribution installations and (3) steps to establish an insulators management plan based on condition and risk of failure. In this research these three topics are covered. A full review of literature about management of electrical distribution assets is included, followed by a specific plan developed for monitoring, diagnosis and ranking of insulators mainly supported by visual inspections. Diagnosis of medium voltages EPDM insulators recovered from service aged under different conditions is done using both traditional techniques and, uniquely, dielectric impedance. The relationship between surface roughness and static contact angle is also used to characterize insulators' surfaces. Early stages of degradation are studied focusing the experimental work to evaluate the electrohydrodynamic processes which occur on new samples under different conditions, giving special attention to leakage current pulse analysis, electric field enhancement, and resistance/capacitive behaviour including phase of leakage current. Results from each specific topic offer additional understanding of polymer insulators degradation providing insight to monitoring, diagnosis and management. Additionally, results open new topics in which new investigations are proposed.

Subjects/Keywords: 621.31937; composite insulators; ageing; early stages; water droplets; electric field; corona discharges

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Da Silva domingues, E. (2012). Improved condition monitoring of composite insulators. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/improved-condition-monitoring-of-composite-insulators(d42e15fb-d9c2-4e45-94b9-3321e9d9b9f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553396

Chicago Manual of Style (16^th Edition):

Da Silva domingues, Elizabeth. “Improved condition monitoring of composite insulators.” 2012. Doctoral Dissertation, University of Manchester. Accessed December 10, 2019. https://www.research.manchester.ac.uk/portal/en/theses/improved-condition-monitoring-of-composite-insulators(d42e15fb-d9c2-4e45-94b9-3321e9d9b9f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553396.

MLA Handbook (7^th Edition):

Da Silva domingues, Elizabeth. “Improved condition monitoring of composite insulators.” 2012. Web. 10 Dec 2019.

Vancouver:

Da Silva domingues E. Improved condition monitoring of composite insulators. [Internet] [Doctoral dissertation]. University of Manchester; 2012. [cited 2019 Dec 10]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/improved-condition-monitoring-of-composite-insulators(d42e15fb-d9c2-4e45-94b9-3321e9d9b9f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553396.

Council of Science Editors:

Da Silva domingues E. Improved condition monitoring of composite insulators. [Doctoral Dissertation]. University of Manchester; 2012. Available from: https://www.research.manchester.ac.uk/portal/en/theses/improved-condition-monitoring-of-composite-insulators(d42e15fb-d9c2-4e45-94b9-3321e9d9b9f0).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553396

Queensland University of Technology

5. Hinde, David Derek. Corona discharges on the surfaces of high voltage composite insulators.

Degree: 2009, Queensland University of Technology

URL: https://eprints.qut.edu.au/29320/

► The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage… (more)

▼ The degradation of high voltage electrical insulation is a prime factor that can significantly influence the reliability performance and the costs of maintaining high voltage electricity networks. Little information is known about the system of localized degradation from corona discharges on the relatively new silicone rubber sheathed composite insulators that are now being widely used in high voltage applications. This current work focuses on the fundamental principles of electrical corona discharge phenomena to provide further insights to where damaging surface discharges may localize and examines how these discharges may degrade the silicone rubber material. Although water drop corona has been identified by many authors as a major cause of deterioration of silicone rubber high voltage insulation until now no thorough studies have been made of this phenomenon. Results from systematic measurements taken using modern digital instrumentation to simultaneously record the discharge current pulses and visible images associated with corona discharges from between metal electrodes, metal electrodes and water drops, and between waters drops on the surface of silicone rubber insulation, using a range of 50 Hz voltages are inter compared. Visual images of wet electrodes show how water drops can play a part in encouraging flashover, and the first reproducible visual images of water drop corona at the triple junction of water air and silicone rubber insulation are presented. A study of the atomic emission spectra of the corona produced by the discharge from its onset up to and including spark-over, using a high resolution digital spectrometer with a fiber optic probe, provides further understanding of the roles of the active species of atoms and molecules produced by the discharge that may be responsible for not only for chemical changes of insulator surfaces, but may also contribute to the degradation of the metal fittings that support the high voltage insulators. Examples of real insulators and further work specific to the electrical power industry are discussed. A new design concept to prevent/reduce the damaging effects of water drop corona is also presented.

Subjects/Keywords: corona discharges; discharge current; onset voltage; point-plane; repetition rate; Trichel pulse; emission spectra; silicone rubber; water drop corona; high voltage insulators

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hinde, D. D. (2009). Corona discharges on the surfaces of high voltage composite insulators. (Thesis). Queensland University of Technology. Retrieved from https://eprints.qut.edu.au/29320/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hinde, David Derek. “Corona discharges on the surfaces of high voltage composite insulators.” 2009. Thesis, Queensland University of Technology. Accessed December 10, 2019. https://eprints.qut.edu.au/29320/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hinde, David Derek. “Corona discharges on the surfaces of high voltage composite insulators.” 2009. Web. 10 Dec 2019.

Vancouver:

Hinde DD. Corona discharges on the surfaces of high voltage composite insulators. [Internet] [Thesis]. Queensland University of Technology; 2009. [cited 2019 Dec 10]. Available from: https://eprints.qut.edu.au/29320/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hinde DD. Corona discharges on the surfaces of high voltage composite insulators. [Thesis]. Queensland University of Technology; 2009. Available from: https://eprints.qut.edu.au/29320/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

6. Zagkanas, Vasileios. Διερεύνηση του φαινομένου της εκκένωσης κορώνα σε γραμμές μεταφοράς.

Degree: 2014, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ)

URL: http://hdl.handle.net/10442/hedi/39717

►

The salient characteristics of corona discharge on overhead transmission lines have been investigated. This was achieved with the aid of corona inception models that were… (more)

▼

The salient characteristics of corona discharge on overhead transmission lines have been investigated. This was achieved with the aid of corona inception models that were developed based on the physical processes involved in electrical discharges and take into account the form of corona discharge (glow or streamer). Thus, insight into the corona inception mechanism, as influenced by the geometric field distribution around the stressed electrode, form and polarity of the applied voltage and atmospheric conditions, has been gained. The estimated corona inception characteristics have been assessed and discussed through comparisons with literature experimental data and also validated against results obtained through scale model experiments by using the coaxial cylindrical electrode arrangement. Approximate expressions for the estimation of the corona inception field strength under steady or slowly varying electric fields have been proposed, which account accurately for the effects of voltage polarity, conductor radius and atmospheric conditions. An empirical expression has been proposed for the irregularity factor of stranded conductors, accounting well for the effects of conductor geometry and relative air density. Corona inception voltage of bundle conductors can be satisfactorily estimated by using the maximum value of the geometric field strength on the surface of the bundle conductors and the corona inception field strength of a single conductor of the same radius. Under DC voltages higher than the threshold value required for corona inception, corona current, thus also the associated power losses, can be well estimated through an approximate expression that considers the amplitude and polarity of the applied voltage, conductor geometry, outer cylinder radius and relative air density. The developed corona inception models can be used for the assessment of the characteristics of corona discharge on overhead transmission lines; this was shown for typical 150 kV overhead lines of the Hellenic transmission system. Under slowly varying overvoltages and standard atmospheric conditions, the corona inception voltage was found about 60% higher than the maximum value of the phase-to-ground voltage of the transmission lines. The irregularity factors of the line conductors can be estimated on the safe side by using the empirical expression derived based on scale model experiments. Corona inception voltages higher than that estimated under slowly varying overvoltages can be obtained under fast-front overvoltage surges with steepness higher than a threshold value; the latter, as also the rate of increase of corona inception voltage with overvoltage steepness, depends mainly on the conductor radius. This dependence of the corona inception voltage on the steepness of the overvoltage waveform must be considered in insulation coordination studies, where the attenuation and distortion of overvoltage surges propagating along overhead transmission lines due to corona effects is concerned.

Στην παρούσα διατριβή διερευνήθηκαν τα…

Subjects/Keywords: Εκκένωση κορώνα; Εναέριες γραμμές μεταφοράς; Ηλεκτρικές εκκενώσεις; Υψηλές τάσεις; Corona discharge; Overhead transmission lines; Electrical discharges; High voltage

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APA (6^th Edition):

Zagkanas, V. (2014). Διερεύνηση του φαινομένου της εκκένωσης κορώνα σε γραμμές μεταφοράς. (Thesis). Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Retrieved from http://hdl.handle.net/10442/hedi/39717

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zagkanas, Vasileios. “Διερεύνηση του φαινομένου της εκκένωσης κορώνα σε γραμμές μεταφοράς.” 2014. Thesis, Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ). Accessed December 10, 2019. http://hdl.handle.net/10442/hedi/39717.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zagkanas, Vasileios. “Διερεύνηση του φαινομένου της εκκένωσης κορώνα σε γραμμές μεταφοράς.” 2014. Web. 10 Dec 2019.

Vancouver:

Zagkanas V. Διερεύνηση του φαινομένου της εκκένωσης κορώνα σε γραμμές μεταφοράς. [Internet] [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2014. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/10442/hedi/39717.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zagkanas V. Διερεύνηση του φαινομένου της εκκένωσης κορώνα σε γραμμές μεταφοράς. [Thesis]. Aristotle University Of Thessaloniki (AUTH); Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (ΑΠΘ); 2014. Available from: http://hdl.handle.net/10442/hedi/39717

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

McGill University

7. Wiseman, Nicholas. Oxidation in electric discharges.

Degree: PhD, Department of Chemical Engineering, 1971, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile70663.pdf

Subjects/Keywords: Electric discharges.; Oxidation.; Corona (Electricity); Hydrogen sulfide.

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wiseman, N. (1971). Oxidation in electric discharges. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile70663.pdf

Chicago Manual of Style (16^th Edition):

Wiseman, Nicholas. “Oxidation in electric discharges.” 1971. Doctoral Dissertation, McGill University. Accessed December 10, 2019. http://digitool.library.mcgill.ca/thesisfile70663.pdf.

MLA Handbook (7^th Edition):

Wiseman, Nicholas. “Oxidation in electric discharges.” 1971. Web. 10 Dec 2019.

Vancouver:

Wiseman N. Oxidation in electric discharges. [Internet] [Doctoral dissertation]. McGill University; 1971. [cited 2019 Dec 10]. Available from: http://digitool.library.mcgill.ca/thesisfile70663.pdf.

Council of Science Editors:

Wiseman N. Oxidation in electric discharges. [Doctoral Dissertation]. McGill University; 1971. Available from: http://digitool.library.mcgill.ca/thesisfile70663.pdf

Université Paris-Sud – Paris XI

8. Le Delliou, Pierre. Étude des décharges électriques impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires : Investigations on pulsed atmospheric pressure electrical discharges inside porous and/or alveolar media.

Degree: Docteur es, Physique des plasmas, 2014, Université Paris-Sud – Paris XI

URL: http://www.theses.fr/2014PA112164

► Ce travail porte sur l’étude de la propagation de décharges couronnes impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires. Face à la complexité… (more)

▼ Ce travail porte sur l’étude de la propagation de décharges couronnes impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires. Face à la complexité des phénomènes mis en jeu, liés aux interactions entre la décharge et les surfaces du matériau qui la confine, nous proposons l’étude de décharges confinées par des structures élémentaires. L’étude du confinement radial des décharges, assuré par un large panel de capillaires, a été réalisée. Des diagnostics électriques et optiques de pointe permettent d’étudier la propagation de la décharge au sein des différents capillaires. La corrélation entre ces diagnostics a même permis des mesures de vitesse de propagation au sein de capillaires opaques. Les résultats montrent que la propagation de la décharge dépend grandement de la géométrie des capillaires et des paramètres électriques de génération de la décharge. Dans le cas de sections carrées ou rectangulaires, les arêtes induisent un renforcement local du champ qui attire la décharge. Dans le cas de capillaires cylindriques, le diamètre interne est le paramètre crucial qui détermine aussi bien la structure de la décharge que sa vitesse de propagation. Quelle que soit la nature du capillaire, la propagation présente alors une vitesse optimale à tout autre paramètre constant pour une valeur donnée du diamètre interne. Dans le cas du verre, la vitesse est maximale pour un diamètre interne de 200 µm. L’épaisseur et la permittivité diélectrique du capillaire possèdent également une influence sur la propagation de la décharge radialement confinée. Ainsi, diminuer l’épaisseur ou la permittivité diélectrique engendre une accélération de la décharge. Si l’épaisseur est très faible, la décharge peut même se déconfiner pour se propager à l’extérieur du capillaire. Une étude spectroscopique complémentaire montre que la réduction du diamètre de confinement implique une augmentation de la température du plasma, ce qui pourrait contribuer à l’obtention de ce profil de vitesse en fonction du diamètre de confinement. L’étude du confinement axial des décharges a ensuite été réalisée en insérant des membranes de différentes natures et caractéristiques, perpendiculairement à l’axe pointe plan. Les résultats montrent que la décharge présente une propagation en trois étapes : pointe/membrane, radialement au voisinage de la membrane, puis membrane/plan. Dans cette étude, nous avons mis en évidence l’importance du critère poreux ou non de la membrane. Dans le cas poreux, la propagation de la décharge dans l’ensemble du gap est continue, même pour des pores de l’ordre de la dizaine de µm. Dans le cas non poreux, la propagation est discontinue, et il est nécessaire pour assurer la propagation dans l’ensemble du gap qu’un ré-allumage ait lieu de l’autre côté de la membrane. Après l’instant de l’impact sur la membrane, la décharge marque un arrêt qui correspond à la réorganisation des charges et à la restructuration du champ électrique dans le gap. Elle se propage ensuite radialement au voisinage de la membrane en plusieurs… Advisors/Committee Members: Tardiveau, Pierre (thesis director).

Subjects/Keywords: Plasma froid; Décharges couronnes; Décharges pulsées nanosecondes; Milieu poreux; Non-thermal plasma; Corona discharges; Nanosecond pulsed discharge; Porous media

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Le Delliou, P. (2014). Étude des décharges électriques impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires : Investigations on pulsed atmospheric pressure electrical discharges inside porous and/or alveolar media. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2014PA112164

Chicago Manual of Style (16^th Edition):

Le Delliou, Pierre. “Étude des décharges électriques impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires : Investigations on pulsed atmospheric pressure electrical discharges inside porous and/or alveolar media.” 2014. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed December 10, 2019. http://www.theses.fr/2014PA112164.

MLA Handbook (7^th Edition):

Le Delliou, Pierre. “Étude des décharges électriques impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires : Investigations on pulsed atmospheric pressure electrical discharges inside porous and/or alveolar media.” 2014. Web. 10 Dec 2019.

Vancouver:

Le Delliou P. Étude des décharges électriques impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires : Investigations on pulsed atmospheric pressure electrical discharges inside porous and/or alveolar media. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2014. [cited 2019 Dec 10]. Available from: http://www.theses.fr/2014PA112164.

Council of Science Editors:

Le Delliou P. Étude des décharges électriques impulsionnelles à pression atmosphérique dans les milieux poreux et/ou alvéolaires : Investigations on pulsed atmospheric pressure electrical discharges inside porous and/or alveolar media. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2014. Available from: http://www.theses.fr/2014PA112164

McGill University

9. Stradal, Milos. Surface treatment of polyethylene in electrical discharges.

Degree: PhD, Department of Chemistry, 1974, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile147958.pdf

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Note:

Corona treatment in oxygen, nitrogen, helium and argon substantially enhanced the autohesion of low density polyethylene. The power consumed rather than the nature of… (more)

▼

Note:

Corona treatment in oxygen, nitrogen, helium and argon substantially enhanced the autohesion of low density polyethylene. The power consumed rather than the nature of the gas in the discharge proved to be the important variable controlling the increase in the autohesion. Corona-induced oxidation of polyethylene had a detrimental effect upon bonding. Increase in polymer density and surface roughness lowered the autohesion. The temperature dependence of bonding for both rough and smooth surfaces, either untreated or treated, was similar to the temperature dependence of viscous flow of polyethylene. The rates of decay on aging of surface charge and capacity for autohesion of corona treated polyethylene followed similar trends, increasing with increase in the temperature of storage. However it was shown that the corona-induced autohesion was not due to the presence of surface charge. Corona-induced oxidation of polyethylene was not a prerequisite for the good bonding of printing ink to the surface of the plastic.

Le traitement par corona dans l'oxygène, l'azote, l'hélium et l'argon ont augmenté d'une manière substantielle l'autoadhésion du polyéthylène de faible densité. Il a été démontre que la puissance consommée plutôt que la nature dugaz dans la décharge est le facteur important qui contrôle l'augmentation d'autoadhésion. L'oxydation du polyéthylène induite par corona avait un effet nuisible sur la liaison. L'augmentation de densité du polymère et de la rugosité de la surface ont diminué l'autoadhésion. La dépendance de la liaison a la température pour des surfaces rugueuses et lisses, traitées ou non-traitées, allait de pair avec la dépendance de la température du flux visqueux du polyéthylène. Les vitesses de décroissance de la charge de surface et de la capacité après vieillissement pour l'autoadhésion du polyéthylène traite par corona ont montré des tendances similaires, augmentant avec l'augmentation de température de stockage. Néanmoins, Il a été prouvé que l'autoadhésion induite par corona n'était pas due à la présence de la charge de surface. L'oxydation du polyéthylène induite par corona n'était pas nécessaire a la bonne liaison de l'encre d'imprimerie a la surface du plastique.

Advisors/Committee Members: Goring, D. A. I. (Supervisor).

Subjects/Keywords: Polyethylene; Electric discharges through gases.; Corona (Electricity); Adhesion.; Surfaces.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Stradal, M. (1974). Surface treatment of polyethylene in electrical discharges. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile147958.pdf

Chicago Manual of Style (16^th Edition):

Stradal, Milos. “Surface treatment of polyethylene in electrical discharges.” 1974. Doctoral Dissertation, McGill University. Accessed December 10, 2019. http://digitool.library.mcgill.ca/thesisfile147958.pdf.

MLA Handbook (7^th Edition):

Stradal, Milos. “Surface treatment of polyethylene in electrical discharges.” 1974. Web. 10 Dec 2019.

Vancouver:

Stradal M. Surface treatment of polyethylene in electrical discharges. [Internet] [Doctoral dissertation]. McGill University; 1974. [cited 2019 Dec 10]. Available from: http://digitool.library.mcgill.ca/thesisfile147958.pdf.

Council of Science Editors:

Stradal M. Surface treatment of polyethylene in electrical discharges. [Doctoral Dissertation]. McGill University; 1974. Available from: http://digitool.library.mcgill.ca/thesisfile147958.pdf

10. Lara, Juan de. CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides.

Degree: 2018, Elsevier B.V.

URL: http://hdl.handle.net/10486/662821

Subjects/Keywords: Corona; Discrete-event simulation; Electric discharges; Hybrid simulation; Multipactor; Simulation tools; Informática

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lara, J. d. (2018). CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides. (Thesis). Elsevier B.V. Retrieved from http://hdl.handle.net/10486/662821

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lara, Juan de. “CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides.” 2018. Thesis, Elsevier B.V. Accessed December 10, 2019. http://hdl.handle.net/10486/662821.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lara, Juan de. “CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides.” 2018. Web. 10 Dec 2019.

Vancouver:

Lara Jd. CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides. [Internet] [Thesis]. Elsevier B.V.; 2018. [cited 2019 Dec 10]. Available from: http://hdl.handle.net/10486/662821.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lara Jd. CEST and MEST: Tools for the simulation of radio frequency electric discharges in waveguides. [Thesis]. Elsevier B.V.; 2018. Available from: http://hdl.handle.net/10486/662821

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

11. Šipoldová, Zuzana. Etude de traitement par plasma froid de surfaces contaminés par biofilms : Bio-decontamination of biofilms on surfaces by cold plasma.

Degree: Docteur es, Physique, 2016, Paris Saclay; Univerzita Komenského (Bratislava)

URL: http://www.theses.fr/2016SACLC054

►

Dans cette thèse, les applications des plasmas à basse température à la pression atmosphérique sont discutées. En particulier, la bio-décontamination des bactéries planctoniques et biofilms… (more)

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Dans cette thèse, les applications des plasmas à basse température à la pression atmosphérique sont discutées. En particulier, la bio-décontamination des bactéries planctoniques et biofilms bactériens sur des surfaces planes et complexe sont réalisées par des décharges corona de l'air et de plasma d'argon. Dans ce travail, nous caractérisons trois sources de plasma qui sont utilisées pour la décontamination d'Escherichia coli. CC corona décharges dans l'air - corona streamer positive et négative des impulsions Trichel ont été utilisés pour la décontamination des bactéries planctoniques et biofilms bactériens. Dans certaines expériences de l'eau a été électro-pulvérisée sur des échantillons de haute tension électrode. Bio-décontamination des biofilms bactériens a été réalisée sur des lames en verre, pendant 15 min le traitement de plasma a été rendu majorités des bactéries incultivables. Selon la microscopie confocale à balayage laser de biofilms colorées par kit de la viabilité, une partie de ces bactéries incultivables restait viables, seulement les couches les plus supérieures du biofilm ont été tuées. La deuxième source de plasma est corona décharge pulsée propagé à l'intérieur du tube de quartz longue et étroite où l'argon sec ou l'argon avec de la vapeur d'eau coulait à la pression atmosphérique. Ce type de décharge et a une application potentielle dans la décontamination des surfaces intérieures des cathéters ou d'autres dispositifs longs et tubulaires ou pourrait fournir un plasma à basse température sur des distances longues à l'intérieur du corps humain. Tout d'abord, cette source de plasma à basse température a été caractérisée par ses paramètres électriques, et ensuite, une spectroscopie d'émission optique identifiés l'émission de plasma UV-B de radical hydroxyle excité en particulier avec l'argon humide. L'effet de cette UV-B a été testé sur des bactéries planctoniques et a été découvert pour causer jusqu'à un dommage substantiel encore plus loin en aval du tube. La source de plasma d'argon dernière doit aller qui utilise l'argon saturé sec, humide ou de l'eau en tant que gaz de travail. Cette décharge a été principalement utilisée pour la décontamination biofilm, et nous avons reçu des résultats similaires comme décharges corona CC.

In this PhD thesis, applications of lowtemperature plasmas at atmospheric pressure are discussed. In particular, bio-decontamination of planktonic bacteria and bacterial biofilms on flat and complex surfaces by air corona discharges and argon plasma. In this work, we characterize three plasma sources which are used for decontamination of Escherichia coli. DC corona discharges in air - positive streamer corona and negative Trichel pulses were used for decontamination of planktonic bacteria and bacterial biofilms. In some experiments water was electrosprayed onto samples from high voltage electrode. Bio-decontamination of bacterial biofilms was carried out on glass cover slides, within 15 min plasma treatment most of the bacteria were rendered uncultivable. Part from these…

Advisors/Committee Members: Odic, Emmanuel (thesis director), Machala, Zdenko (thesis director).

Subjects/Keywords: Décharge couronne; Jet de plasma d'argon; E. coli; Bactéries planctoniques; Biofilm bactérien; Corona discharges; Argon plasma jet; Escherichia coli; Planktonic bacteria; Bacterial biofilm

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Šipoldová, Z. (2016). Etude de traitement par plasma froid de surfaces contaminés par biofilms : Bio-decontamination of biofilms on surfaces by cold plasma. (Doctoral Dissertation). Paris Saclay; Univerzita Komenského (Bratislava). Retrieved from http://www.theses.fr/2016SACLC054

Chicago Manual of Style (16^th Edition):

Šipoldová, Zuzana. “Etude de traitement par plasma froid de surfaces contaminés par biofilms : Bio-decontamination of biofilms on surfaces by cold plasma.” 2016. Doctoral Dissertation, Paris Saclay; Univerzita Komenského (Bratislava). Accessed December 10, 2019. http://www.theses.fr/2016SACLC054.

MLA Handbook (7^th Edition):

Šipoldová, Zuzana. “Etude de traitement par plasma froid de surfaces contaminés par biofilms : Bio-decontamination of biofilms on surfaces by cold plasma.” 2016. Web. 10 Dec 2019.

Vancouver:

Šipoldová Z. Etude de traitement par plasma froid de surfaces contaminés par biofilms : Bio-decontamination of biofilms on surfaces by cold plasma. [Internet] [Doctoral dissertation]. Paris Saclay; Univerzita Komenského (Bratislava); 2016. [cited 2019 Dec 10]. Available from: http://www.theses.fr/2016SACLC054.

Council of Science Editors:

Šipoldová Z. Etude de traitement par plasma froid de surfaces contaminés par biofilms : Bio-decontamination of biofilms on surfaces by cold plasma. [Doctoral Dissertation]. Paris Saclay; Univerzita Komenského (Bratislava); 2016. Available from: http://www.theses.fr/2016SACLC054

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