|Phone||+41 44 632 2558|
|Dominique Ballarin Dolfin|
|Phone||+41 44 632 3465|
I am a plasma physicist obtained a BSc in Physics from Mansoura University, Egypt in 2015, and MSc in plasma and nuclear fusion from Ghent University, Belgium in 2018. Free-CO2 energy sources, such as geothermal energy and nuclear fusion, is the main motivation of my research. My research in GEG group focuses on understanding the fundamentals of the pulsed plasma technology for deep geothermal drilling (5-10 km). We employee the knowledge of plasma to investigate the rock breaking process by nanosecond pulses with maximum voltage 300-500 kV based on the arcing concept.
- Plasma modeling.
- Plasma Pulse Geo Drilling.
- Electric breakdown in solids.
- In MSc, Fusion Plasma (i.e., modeling of the impurity transport).
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Underlined names are links to current or past GEG members
REFEREED PUBLICATIONS IN JOURNALS
Plasma Pulse Geo Drilling (PPGD) is a contact-less drilling technique, where an electric discharge across a rock sample causes the rock to fracture.
Experimental results have shown PPGD drilling operations are successful if certain electrode spacings, pulse voltages, and pulse rise times are given.
However, the underlying physics of the electric breakdown within the rock, which cause damage in the process, are still poorly understood.
This study presents a novel methodology to numerically study plasma generation for electric pulses between 200 to 500 kV in rock pores with a width between 10 and 100 \(\mu\)m. We further investigate whether the pressure increase, induced by the plasma generation, is sufficient to cause rock fracturing, which is indicative of the onset of drilling success.
We find that rock fracturing occurs in simulations with a 100 \(\mu\)m. pore size and an imposed pulse voltage of approximately 400 kV. Furthermore, pulses with voltages lower than 400 kV induce damage near the electrodes, which expands from pulse to pulse, and eventually, rock fracturing occurs. Additionally, we find that the likelihood for fracturing increases with increasing pore voltage drop, which increases with pore size, electric pulse voltage, and rock effective relative permittivity while being inversely proportional to the rock porosity and pulse rise time.
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