In-situ particle sizing at millimeter scale from electrochemical noise: simulation and experiments
Résumé
Over the last few years, particle sizing techniques in multiphase
flows based on optical technologies
emerged as standard tools but the main disadvantage of these techniques is their dependence on the
visibility of the measurement volume and on the focal distance. Thus, it is important to promote
alternative techniques for particle sizing, and, moreover, able to work in hostile environment. This paper
presents a single-particle sizing technique at a millimeter scale based on the measurement of the
variation of the electrolyte resistance (ER) due to the passage of an insulating sphere between two
electrodes immerged in a conductive solution. A theoretical model was proposed to determine the
influence of the electrode size, the interelectrode distance, the size and the position of the sphere, on the
electrolyte resistance. Experimental variations of ER due to the passage of spheres and measured by using
a home-made electronic device are also presented in this paper. The excellent agreement obtained
between the theoretical and experimental results allows validation of both model and experimental
measurements. In addition, the technique was shown to be able to perform accurate measurements of
the velocity of a ball falling in a liquid.
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