NDLI: A chemical reaction-based boundary condition for flow electrification

Content Provider	IEEE Xplore Digital Library
Author	Washabaugh, A.P. Zahn, M.
Copyright Year	1994
Abstract	A physical model is developed for the charge transfer boundary condition in semi-insulating liquids. The boundary condition is based upon interfacial chemical reactions and extends established relations for the interface by including the effects of interfacial surface charge and charge desorption at the interface. A steady state model for flow electrification in a rotating cylindrical electrode apparatus incorporated this boundary condition and described polarity changes in the open-circuit voltage and short-circuit current as a function of the fluid velocity, the volume charge density dependence an the terminal constraints, and the charge density dependence on applied dc voltages. Previously used boundary conditions are shown to be special cases of the chemical reaction rate boundary condition. A general methodology is developed for combining the volume charge density and voltage/current terminal measurements to estimate the parameters describing the interfacial charge transfer kinetics. Volume charge densities /spl rho//sup w/ on the liquid side of the interfaces of 1 to 20 mC/m/sup 3/ were estimated from the open-circuited electrode measurements, with the stainless steel /spl rho//sup w/ typically larger than that of copper but smaller than that of transformer pressboard. Activation energies for an Arrhenius temperature dependence of /spl sim/0.16 eV for pressboard, 0.25 eV for stainless steel and 0.28 eV for copper were obtained. Interfacial adsorption reaction velocities, estimated to be 10/sup -5/ m/s, were not large enough to make the terminal current transport limited which contradicts the often used assumption that the reaction velocities can be considered 'infinite'. Estimated surface reaction rates at a 70/spl deg/C stainless steel/oil interface of /spl sim/20 /spl mu/m/s for adsorption and /spl sim/0.5 s/sup -1/ for desorption were obtained. The additive BTA reduced the /spl rho//sup w/ for pressboard and stainless steel at concentrations >8 ppm in transformer oil.
Sponsorship	National Natural Science Foundation of China (NSFC) Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE Sandia National Laboratories TOSHIBA
Starting Page	688
Ending Page	709
Page Count	22
File Size	2455058
File Format	PDF
ISSN	10709878
Volume Number	4
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chemicals Boundary conditions Steel Voltage Charge transfer Electrodes Density measurement Current measurement Charge measurement Volume measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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