Abstract
A technique has been developed for the production of small spots or volumes of ionized gas and the processes of diffusion of these spots have been investigated for the case of emission in a nearly non-turbulent flow (wind-tunnel) as well as in the turbulent flow created behind a square mesh-grid. The diffusion of these charged molecules has been related to the decreasing electrical potential induced at the top of an antenna placed on the main flow axis. The study has shown different phases of dispersion in non turbulent flows; in a strongly turbulent flow, the homogeneisation of diffusion of random molecular motions is illustrated by a uniform law for decreasing induced potentials along the flow-axis; A greater diffusion rate is also observed in that case. An analysis of the transversal expansion of the small ionized clouds has been developed from which the charge density has been deduced. Finally, the charge dispersion rate has been related to the local relative kinetic energy of agitation.
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