Method for measuring relative velocity between medium and surface of metal, and device utilized

A metal surface and relative flow velocity technology, applied in measuring devices, fluid velocity measurement, velocity/acceleration/impact measurement, etc., can solve problems such as the method of measuring the scalar flow velocity of the medium that has not been seen, and achieve the simple and easy method of force measurement Effect

Inactive Publication Date: 2006-04-19
OCEAN UNIV OF CHINA
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Problems solved by technology

At present, there is no method for measuring the relative scalar

Method used

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  • Method for measuring relative velocity between medium and surface of metal, and device utilized
  • Method for measuring relative velocity between medium and surface of metal, and device utilized
  • Method for measuring relative velocity between medium and surface of metal, and device utilized

Examples

Experimental program
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Embodiment Construction

[0011] The limiting current density of the oxygen reduction reaction in the medium is

[0012] i d = nFDδ -1

[0013] where, δ=f(v)i d n is the number of electrons in the oxygen reduction reaction; F is the Faraday constant; D is the diffusion coefficient of oxygen molecules in the medium; δ is the thickness of the diffusion layer, which is a function of the flow rate v. In the formula, n, F, and D are all constants, so the limiting current density i d It is only related to the thickness of the diffusion layer δ. Since the thickness of the diffusion layer δ decreases with the increase of the medium flow rate, the limiting current density i can be determined by d To calculate the thickness δ of the diffusion layer, and then calculate the relative flow velocity on the surface of the medium. The limiting current density i can be obtained by measuring the cathodic polarization curve of the platinum electrode in the medium d .

[0014] The device for m...

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Abstract

Outer electrode of flow transducer is put into medium to be tested. Using dual potentiostat carries out cathodic polarization in order to measure ratio of limit current density between outer id and inner id in media with different velocities of flow as well as to make working curve between velocity of flow and ratio of current density. Then, based on measured ratio of current density and the working curve obtains relative flow rate of medium to surface of metal. The flow transducer includes outer electrode and inner electrode. Outer electrode and inner electrode respectively include working electrode, auxiliary electrode and reference electrode, which are constituted from circular or quadrate platinum sheet or stainless steel sheet. Advantages are: easy of implementation, reliable and estimating speed of metallic corrosion directly.

Description

technical field [0001] The invention relates to a method and a device for measuring the relative flow velocity of a medium on a metal surface. Background technique [0002] The flow rate of the medium has a great influence on the corrosion rate of the metal. To measure and evaluate the corrosion rate of the metal, the relative flow rate of the medium on the metal surface must be determined. What affects the metal corrosion rate is only the relative flow velocity of the medium to the metal surface in the range of several millimeters, which has nothing to do with the flow direction of the medium, that is, only a scalar quantity needs to be measured. However, the currently widely used medium flow velocity measurement instruments measure the overall flow velocity and flow direction of the medium relative to a fixed reference object, and it is not suitable for measuring the direction-independent flow velocity of the medium within a small range of distance on the metal surface. A...

Claims

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Application Information

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IPC IPC(8): G01N17/02G01N27/00G01P5/00
Inventor 王佳
Owner OCEAN UNIV OF CHINA
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