A linearized corrosion double-layer model for laminar flow electrification of hydrocarbon liquids in metal pipes
- Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering
- Univ. de Poitiers (France). Lab. de Physique et Mecanique des Fluides
When a hydrocarbon liquid flows through a metal pipe, an axial streaming current is generated, convected along the pipe, and spilled out into a collection vessel. Flow electrification raises explosion concerns in the petroleum industry. A metal/liquid interface corrosion-reaction model is developed for the flow electrification of low-conductivity liquids in metal pipes. In the proposed model, impurity anions participate in corrosion reaction at the wall, leaving a net positive ion concentration in the diffuse electrical double layer. Convection of this positive charge constitutes the streaming current. Theoretical calculations for the convected space charge density demonstrate a velocity-dependent entrance effect that diminishes in pipes of larger radii, in agreement with experimental data for heptane in stainless steel pipes. Far downstream, the proposed model also correctly predicts that the convected space charge density falls with increasing pipe radius. As in previous work, the convected space charge density far downstream, is found to be linear with the {zeta}-potential. However, the proposed model is self-consistent in that the {zeta}-potential arises as part of the calculation and is not an adjustable constant characteristic only of the metal/hydrocarbon interface.
- OSTI ID:
- 376248
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 35, Issue 9; Other Information: PBD: Sep 1996
- Country of Publication:
- United States
- Language:
- English
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