Measurement of local parameters of a liquid flow using electrical impedance sensors

Abstract

The paper considers a method for measuring liquid flow parameters based on simultaneous recordkeeping of the spatial distribution of characteristics of complex conductivity and dielectric permittivity of a liquid. Measurements can be carried out simultaneously in a great number of measuring nodes. The sensor is assembled on a grid basis and consists of two groups of wire electrodes, spaced apart along two parallel planes; the projection of the intersection locations of the electrodes forms measurement nodes. The method offers a good space and time localization. The measurement rate can work up to tens of thous ands of readings at all measurement nodes per second. This fact makes it possible to investigate non-steady processes of heat and mass transfer. The investigators tested the method by measuring the evolution of a liquid droplet in some amount of another liquid.