Argentum Solutions, Inc.

    Sterling guidance on corrosion and materials degradation
 

Potential-pH Diagrams
THERMEXPERT - Potential-pH diagram generator

Intelligent Tools

POLEXPERT - Polarization Scan Artificial Neural Network Expert System

SEQEXPERT - Sequential Immersion Test Artificial Neural Network Expert System

CYLEXPERT - Rotating Cylinder Electrode Intelligent Rotation Rate Calculator

Corrosion Calculator

Corrosion Rate Calculator

Corrosion Economics Estimator

FINCALCULATOR - Corrosion Economic Calculator


TUTORIAL ON CYLEXPERTTM and the ROTATING CYLINDER ELECTRODE

David C. Silverman


Table of Contents

Introduction-What is CYLEXPERT?
Overview of the Experimental Technique
Using CYLEXPERT-a step-by-step procedure
Hydrodynamics of a Smooth Cylinder
  1. Boundary Layer
  2. Mass Transfer Correlations
  3. Assessing Mass Transfer Control 		         Models Relating Geometries
Effect of Surface Roughness
Wall Shear Stress vs. Mass Transfer
CYLEXPERT (The Intelligent Experimental Design Tool)
List of Symbols

Introduction-What is CYLEXPERT?

CYLEXPERT is an internet accessible intelligent tool that enables estimation of a rotation rate range in the rotating cylinder electrode that should be able to simulate mass transfer influenced corrosion in seven field geometries. These field geometries are:
  1. straight pipe
  2. non-circular duct
  3. annulus
  4. curved pipe with curvature between 0° and 180°
  5. wall jet region of impinging jet
  6. downstream of a flow expansion
  7. flat plate

The intelligent tool uses the best available hydrodynamic correlations to estimate the range of rotation rates for the geometry in question. Then from these calculations it uses an Expert System to provide guidance as to the best range of rotation rates for the situation. Finally, CYLEXPERT provides guidance as to how to approach analyzing data to determine if corrosion is controlled by mass transfer or some other velocity sensitivity. This tutorial provides the following:
  • a step-by-step procedure for using CYLEXPERT using a real-life example
  • a brief overview of the rotating cylinder electrode and the experimental technique for using it
  • information and guidance on the hydrodynamic relationships for a smooth cylinder as used in CYLEXPERT to relate conditions to other geometries
  • information on the influence of surface roughness as commonly occurs in the presence of corrosion
  • some remarks on the controversy surrounding use of wall shear stress vs. mass transfer coefficient
To go to a particular topic, click on the active word colored in blue. Clicking on the word "top" at the end of each section will return to the table of contents at the beginning of the tutorial.

Next Page: Overview of the Experimental Technique

Return to Table of Contents




David C. Silverman, Ph.D. - Primary Consultant
E-Mail:     dcsilverman@argentumsolutions.com
Phone:     314-576-3586
Fax:         314-754-9825
Address:   The Argentum House
                14314 Strawbridge Ct.
                Chesterfield, MO 63017