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ASPECT OF THE LIMITING CURRENT DENSITY ALONG THE CIRCUMFERENCE OF A STEEL CYLINDER BY THE EFFECT OF THE FLOW VELOCITY (CATHODIC PROTECTION, CIRCULAR, BOUNDARY LAYER THICKNESS)
Title
AN ASPECT OF THE LIMITING CURRENT DENSITY ALONG THE CIRCUMFERENCE OF A STEEL CYLINDER BY THE EFFECT OF THE FLOW VELOCITY (CATHODIC PROTECTION, CIRCULAR, BOUNDARY LAYER THICKNESS).
Creator
WANG, TIEN-JEN., Florida Atlantic University, Smith, Samuel W., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The influence of hydrodynamic parameters and limiting current density by cathodic protection on a steel cylinder in flowing water is investigated. The limiting current density variations along the circumference of a circular cylinder are determined for different flow velocities. Several methods are also used to relate the cathodic current density distribution to variations in hydrodynamic and diffusional boundary layer thickness along the circumference of the cylinder for laminar and...
Show moreThe influence of hydrodynamic parameters and limiting current density by cathodic protection on a steel cylinder in flowing water is investigated. The limiting current density variations along the circumference of a circular cylinder are determined for different flow velocities. Several methods are also used to relate the cathodic current density distribution to variations in hydrodynamic and diffusional boundary layer thickness along the circumference of the cylinder for laminar and turbulent flow regimes. a comparison of experimental current densities on a cylinder to that predicated by theory is also examined.
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Date Issued
1986
PURL
http://purl.flvc.org/fcla/dt/14316
Subject Headings
Steel--Cathodic protection, Sea-water corrosion
Format
Document (PDF)
COMPUTER MODELING OF POLARIZATION OF A STEEL PLATE AS A FUNCTION OF TEMPERATURE USING FINITE ELEMENT METHOD
Title
COMPUTER MODELING OF POLARIZATION OF A STEEL PLATE AS A FUNCTION OF TEMPERATURE USING FINITE ELEMENT METHOD.
Creator
VARGHESE, BABU., Florida Atlantic University, Smith, Samuel W., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Computerized modeling techniques have been developed for the analysis of polarization behavior, using the expected chemical reactions and transport phenomena applicable to the formation of calcareous deposits. The method uses the ADINAT finite element heat transfer program and is modeled, as much as possible, on theory rather than laboratory measurements. In contrast, the presently available cathodic protection computer models base their polarization behavior on empirical data. The thesis...
Show moreComputerized modeling techniques have been developed for the analysis of polarization behavior, using the expected chemical reactions and transport phenomena applicable to the formation of calcareous deposits. The method uses the ADINAT finite element heat transfer program and is modeled, as much as possible, on theory rather than laboratory measurements. In contrast, the presently available cathodic protection computer models base their polarization behavior on empirical data. The thesis presents experimental versus theoretical data for a simple flat plate configuration under cathodic protection in natural sea water over a range in temperatures. The flat plate allows for a simplified experimental apparatus and simplifies the derivation of equations for the transport phenomena. The program can, however, handle complex three dimensional geometries. Effects of temperature and flow on the formation and protection of calcareous deposits are also discussed in light of the experimental results.
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Date Issued
1986
PURL
http://purl.flvc.org/fcla/dt/14314
Subject Headings
Plates, Iron and steel--Cathodic protection, Sea-water corrosion
Format
Document (PDF)
Computer simulation of calcareous deposition
Title
Computer simulation of calcareous deposition.
Creator
Sadasivan, Gireesh Kumar., Florida Atlantic University, Smith, Samuel W., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Formation of calcareous deposits on marine structures under cathodic protection reduces the current required to protect the surface, as time progresses. Computer aided design methods to date rely heavily on polarization data obtained from laborious and expensive in situ experiments. The present approach lays the foundation for a new design method in which the formation of calcareous deposits is modeled from first principles, based on precipitation and diffusion of ions of the constituent...
Show moreFormation of calcareous deposits on marine structures under cathodic protection reduces the current required to protect the surface, as time progresses. Computer aided design methods to date rely heavily on polarization data obtained from laborious and expensive in situ experiments. The present approach lays the foundation for a new design method in which the formation of calcareous deposits is modeled from first principles, based on precipitation and diffusion of ions of the constituent compounds in the boundary layer. Calcareous deposition in a one dimensional boundary layer was modeled and this model was used successfully to simulate the cathodic protection of a rotating cylinder in artificial sea water. Precipitation rate constant of Mg(OH)$\sb2$ was determined and the pH on the cylinder surface was estimated to be one tenth of a pH unit higher than that required for the precipitation of magnesium hydroxide from sea water.
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Date Issued
1989
PURL
http://purl.flvc.org/fcla/dt/14495
Subject Headings
Calcium--Computer simulation
Format
Document (PDF)
ONCE-THROUGH VERSUS RECIRCULATING SEAWATER TESTING OF CATHODICALLY PROTECTED STEEL FOR CALCAREOUS DEPOSIT FORMATION
Title
ONCE-THROUGH VERSUS RECIRCULATING SEAWATER TESTING OF CATHODICALLY PROTECTED STEEL FOR CALCAREOUS DEPOSIT FORMATION.
Creator
NYE, TRACY LOUISE., Florida Atlantic University, Smith, Samuel W., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The efficiency of cathodic protection of steel in seawater is partially due to calcareous deposits. To better understand deposits, expericents are conducted testing the effects of variables such as tecperature, velocity, and applied current, on film formation and protection capabilities. It is the intent of this thesis to investigate differences in using recirculating seawater rather than once-through seawater in these experiments. It is believed that these differences were caused by an...
Show moreThe efficiency of cathodic protection of steel in seawater is partially due to calcareous deposits. To better understand deposits, expericents are conducted testing the effects of variables such as tecperature, velocity, and applied current, on film formation and protection capabilities. It is the intent of this thesis to investigate differences in using recirculating seawater rather than once-through seawater in these experiments. It is believed that these differences were caused by an increase in dissolved organics in the recirculating bath. Data is in the form of current needed to maintain a potential of -1.0v SCE since differences in current help describe differences in film properties.
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Date Issued
1984
PURL
http://purl.flvc.org/fcla/dt/14224
Subject Headings
Steel--Cathodic protection, Steel--Testing
Format
Document (PDF)
STUDY OF THE EFFECT OF FLOW PARAMETERS ON THE CATHODIC PROTECTION OF A STEEL PLATE IN NATURAL SEAWATER
Title
A STUDY OF THE EFFECT OF FLOW PARAMETERS ON THE CATHODIC PROTECTION OF A STEEL PLATE IN NATURAL SEAWATER.
Creator
MCCABE, KEVIN MICHAEL., Florida Atlantic University, Smith, Samuel W., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The influence of hydrodynamic parameters and cathodic polarization on the formation of calcareous deposits on a steel plate in flowing seawater is investigated. Current density variations on the plate are determined for a combination of applied potentials and seawater velocities. Equations are developed to relate the cathodic current density distribution to variations in hydrodynamic and diffusional boundary layer thickness along the plate for laminar and turbulent flow regimes. A comparison...
Show moreThe influence of hydrodynamic parameters and cathodic polarization on the formation of calcareous deposits on a steel plate in flowing seawater is investigated. Current density variations on the plate are determined for a combination of applied potentials and seawater velocities. Equations are developed to relate the cathodic current density distribution to variations in hydrodynamic and diffusional boundary layer thickness along the plate for laminar and turbulent flow regimes. A comparison of experimental current densities on a bare plate to that predicted by theory is examined. Effects of flow on the formation and properties of calcareous deposits are discussed in light of recent developments in marine cathodic protection.
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Date Issued
1984
PURL
http://purl.flvc.org/fcla/dt/14192
Subject Headings
Plates, Iron and steel--Cathodic protection, Carbon steel--Corrosion, Plates, Iron and steel--Fluid dynamics, Cathodic protection
Format
Document (PDF)