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Journal Nonlinear World №5 for 2009 г.
Article in number:
Creation of Sensors for Diagnostics of Near Wall Flow Using Transfer Processes
Keywords: the transit-time method the hydrodynamical channels the algorithms of signals processing is described
Authors:
Yu.K. Evdokimov, S.A. Startsev
Abstract:
The article presents the description of electrodiffusion transit-time method for measurement of wall shear stress friction in hydrodynamical channels. The method consists in a chronometry of a delay of the ionic score introduced by an electrochemical expedient in a stream from streamline wall. For method realisation the multielectrode system disposed on wall is used. The theory of the method is considered. It is shown, that value of a delay depends on quantity of a shearing stress of a friction on wall. Advantage of the yielded method consists that measuring is reduced to a high-precision chronometry of a delay; effects of such measuring practically do not depend on contamination of a surface of electrode system and a modification of a composition of an electrolyte. Transformation performances « wall shear stress  delay time » for almost laminar and turbulent flows are gained. Algorithms of measuring of a delay are offered. The technique of measurements, the equipment and algorithms of signals processing is described. The results of experimental study, confirming an opportunity of a electrodiffusion transit-time method application for measurement of wall shear stress friction are presented. The experimental performances of transformation « wall shear stress - delay time» are gained. The possibility of application electrodiffusion transit-time method in an aqueous solution of chloride of sodium and in sea-water is experimentally shown, that essentially dilates field of use of electrodiffusive methods
Pages: 394
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