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Toulouse, France

Boeuf J.-P.,National Polytechnic Institute of Toulouse | Boeuf J.-P.,CNRS LAPLACE Lab | Chaudhury B.,National Polytechnic Institute of Toulouse
Physical Review Letters | Year: 2013

The formation of a rotating instability associated with an ionization front ("rotating spoke") and driven by a cross-field current in a cylindrical magnetized plasma is shown and explained for the first time on the basis of a fully kinetic simulation. The rotating spoke is a strong double layer (electrostatic sheath) moving towards the higher potential region at a velocity close to the critical ionization velocity, a concept proposed by Alfvén in the context of the formation of the solar system. The mechanisms of cross-field electron transport induced by this instability are analyzed. © 2013 American Physical Society.

Unfer T.,National Polytechnic Institute of Toulouse | Unfer T.,CNRS LAPLACE Lab
Journal of Computational Physics | Year: 2013

This paper presents an asynchronous framework dedicated to the simulation of plasma discharges interacting or setting in motion the neutral gas. The method is based on Asynchronous Adaptive Mesh Refinement. Extensions of the asynchronous time integration to Runge Kutta method and centered schemes are given. The method is then applied to the simulation of the airflow generated by Surface Dielectric Barrier Discharges driven by sine or nanosecond pulses. © 2012 Elsevier Inc.

Lucia O.,University of Zaragoza | Maussion P.,CNRS LAPLACE Lab | Dede E.J.,University of Valencia | Burdio J.M.,University of Zaragoza
IEEE Transactions on Industrial Electronics | Year: 2014

Induction heating (IH) technology is nowadays the heating technology of choice in many industrial, domestic, and medical applications due to its advantages regarding efficiency, fast heating, safety, cleanness, and accurate control. Advances in key technologies, i.e., power electronics, control techniques, and magnetic component design, have allowed the development of highly reliable and cost-effective systems, making this technology readily available and ubiquitous. This paper reviews IH technology summarizing the main milestones in its development and analyzing the current state of art of IH systems in industrial, domestic, and medical applications, paying special attention to the key enabling technologies involved. Finally, an overview of future research trends and challenges is given, highlighting the promising future of IH technology. © 2013 IEEE.

This paper has for objectives to present the radiative and the transport properties for people beginning in thermal plasmas. The first section will briefly recall the equations defined in numerical models applied to thermal plasmas; the second section will particularly deal with the estimation of radiative losses; the thirpart will quickly present the thermodynamics properties; and the last part will concern the transport coefficients (thermal conductivity, viscosity and electrical conductivity of the gas or mixtures of gases). We shall conclude the paper with a discussion about the validity of these results the lack of data for some specific applications, and some perspectives concerning these properties for non-equilibrium thermal plasmas. © 2015 Author(s).

Grodsky S.A.,University of Maryland University College | Reverdin G.,CNRS LAPLACE Lab | Carton J.A.,University of Maryland University College | Coles V.J.,University of Cambridge
Remote Sensing of Environment | Year: 2014

The fresh Amazon/Orinoco plume covers in excess of 106km2 in late summer-early fall forming a near-surface barrier layer that reduces exchange with the cooler, saltier water below. Barrier layers and higher water turbidity keep SST in the region high and thus are factors in the development of fall season hurricanes. Year to year changes in key properties of salinity and areal coverage may depend on a number of factors including river discharge, ocean rainfall, vertical entrainment rate, and horizontal advection. This study uses new sea surface salinity observations from the Aquarius/SACD and SMOS satellites to show that the plume was 1psu saltier in early fall 2012 than in the previous fall (despite a stronger Amazon discharge in 2012) and explores the possible causes. The study concludes that the most likely causes of the 2012 salinification are a relative deficit of rainfall over the inflow to the plume region well southeast of the plume in spring and a weaker North Brazil current in spring-summer. The results suggest that tracking spring rainfall can potentially contribute to forecasting the Amazon plume stratification during the fall hurricane season. © 2013 Elsevier Inc.

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