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Papers by Pierre Atten

Research paper thumbnail of Streamer propagation over a liquid/solid interface

IEEE Transactions on Dielectrics and Electrical Insulation, 1994

A needle immersed in transformer oil is located just above a sheet of glass of which the opposite... more A needle immersed in transformer oil is located just above a sheet of glass of which the opposite surface is conducting. By applying high-voltage (HV) steps, streamers which propagate radially with numerous branches are generated. The characteristics of these discharges (mean propagation velocity, final extension, and electric current and charge) are determined, and the measured charge is compared with the

Research paper thumbnail of Charges and forces on conductive particles in roll-type corona-electrostatic separators

IEEE Transactions on Industry Applications, 1995

Mathematical modelling is a powerful tool in the optimization of electroseparation technologies a... more Mathematical modelling is a powerful tool in the optimization of electroseparation technologies and equipment. This paper proposes the use of a numerical method of field analysis to evaluate more accurately the charges and forces on millimeter-size conductive particles of virtually any shape in contact with an electrode. A program based on the boundary-element method was tested for this purpose, and

Research paper thumbnail of Experimental investigation of capillary instability: results on jet stimulated by pressure modulations

Experiments in Fluids, 1996

We investigate the behaviour of a liquid jet stimulated by pressure disturbances using a photomet... more We investigate the behaviour of a liquid jet stimulated by pressure disturbances using a photometric measurement of the jet shadow width. Two apparatuses involving lights of different nature are utilized and measurements are taken from the exit of the nozzle to drop breakoff for different operating conditions. Fourier analysis is applied to characterize the spatial evolution of the jet shape.

Research paper thumbnail of Field-induced deformation and disruption of a planar water-oil interface under the influence of a conducting sphere

IEEE International Conference on Dielectric Liquids, 2005. ICDL 2005., 2005

... 0 1 = −′ +′ fBo f r f (5) with condition f → 0 when r → ∞ gives the outer solution (r ≥ rm) w... more ... 0 1 = −′ +′ fBo f r f (5) with condition f → 0 when r → ∞ gives the outer solution (r ≥ rm) which involves the modified Bessel function K0 : ( ) ( ) K 0 1 rBo C r fouter = (6) 0 0.2 ... The inner solution (r ≤ rm) is : ( ) ( ) 2 0 0 2 0 0 1 1 f Bo Be rBo I f Bo Be f r finner − + │ │ ⌋ ...

Research paper thumbnail of Streamer propagation over a liquid/solid interface

IEEE Transactions on Dielectrics and Electrical Insulation, 1994

A needle immersed in transformer oil is located just above a sheet of glass of which the opposite... more A needle immersed in transformer oil is located just above a sheet of glass of which the opposite surface is conducting. By applying high-voltage (HV) steps, streamers which propagate radially with numerous branches are generated. The characteristics of these discharges (mean propagation velocity, final extension, and electric current and charge) are determined, and the measured charge is compared with the

Research paper thumbnail of Charges and forces on conductive particles in roll-type corona-electrostatic separators

IEEE Transactions on Industry Applications, 1995

Mathematical modelling is a powerful tool in the optimization of electroseparation technologies a... more Mathematical modelling is a powerful tool in the optimization of electroseparation technologies and equipment. This paper proposes the use of a numerical method of field analysis to evaluate more accurately the charges and forces on millimeter-size conductive particles of virtually any shape in contact with an electrode. A program based on the boundary-element method was tested for this purpose, and

Research paper thumbnail of Experimental investigation of capillary instability: results on jet stimulated by pressure modulations

Experiments in Fluids, 1996

We investigate the behaviour of a liquid jet stimulated by pressure disturbances using a photomet... more We investigate the behaviour of a liquid jet stimulated by pressure disturbances using a photometric measurement of the jet shadow width. Two apparatuses involving lights of different nature are utilized and measurements are taken from the exit of the nozzle to drop breakoff for different operating conditions. Fourier analysis is applied to characterize the spatial evolution of the jet shape.

Research paper thumbnail of Field-induced deformation and disruption of a planar water-oil interface under the influence of a conducting sphere

IEEE International Conference on Dielectric Liquids, 2005. ICDL 2005., 2005

... 0 1 = −′ +′ fBo f r f (5) with condition f → 0 when r → ∞ gives the outer solution (r ≥ rm) w... more ... 0 1 = −′ +′ fBo f r f (5) with condition f → 0 when r → ∞ gives the outer solution (r ≥ rm) which involves the modified Bessel function K0 : ( ) ( ) K 0 1 rBo C r fouter = (6) 0 0.2 ... The inner solution (r ≤ rm) is : ( ) ( ) 2 0 0 2 0 0 1 1 f Bo Be rBo I f Bo Be f r finner − + │ │ ⌋ ...

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