Abstract
In this paper, a theoretical model of the electrical double layer
development is presented. It takes into account the case of a non-fully
developed double layer at the exit of the pipe and a diffuse layer
thickness non-negligible compared to the capillary radius. Then the
space charge density at the wall rhow is determined by streaming
current experiments of a dielectric liquid (n-heptane) containing
different concentrations of additive (OLOA 218 A) flowing through
a micrometric glass capillary. Results show that rhow increases
with the liquid conductivity in a large range of conductivity (from
about 53 to 1010 pS/m). Furthermore we point out two fundamental
parameters of flow electrification of dielectric liquids: (a) the
velocity of the physicochemical reactions at the wall which induces
the development time of the space charge density at the wall, (b)
the relaxation time on which the development of the diffuse layer
inside the liquid depends.
Users
Please
log in to take part in the discussion (add own reviews or comments).