Testing of Carbon Dioxide Corrosion Inhibitor Performance at High Flow Velocities in Jet Impingement Geometry. Effects of Mass Transfer and Flow Forces

CORROSION ◽  
2007 ◽  
Vol 63 (11) ◽  
pp. 1009-1020 ◽  
Author(s):  
E. Gulbrandsen ◽  
A. Grana˚
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Corrosion Inhibitor ◽  
Jet Impingement ◽  
High Flow ◽  
Carbon Dioxide Corrosion ◽  
Geometry Effects ◽  
Flow Velocities

scholarly journals Flow Dependence of Carbon Dioxide Corrosion Using Short Electrodes by Jet Impingement

CORROSION ◽  
2009 ◽  
Vol 65 (12) ◽  
pp. 771-777 ◽  
Author(s):  
D. John ◽  
B. Kinsella ◽  
S. Bailey ◽  
R. De Marco
Keyword(s):  
Carbon Dioxide ◽  
Jet Impingement ◽  
Carbon Dioxide Corrosion ◽  
Flow Dependence

Relation between the structure of an aerobic biofilm and transport phenomena

1995 ◽  
Vol 32 (8) ◽  
pp. 11-18 ◽  
Author(s):  
Dirk de Beer ◽  
Paul Stoodley
Keyword(s):  
Boundary Layer ◽  
Mass Transfer ◽  
Mass Transport ◽  
Flow Velocity ◽  
Particle Tracking ◽  
Fluorescent Dyes ◽  
High Flow ◽  
Bulk Liquid ◽  
Cell Clusters ◽  
Flow Velocities

An aerobic biofilm was characterized using confocal scanning laser microscopy (CSLM), O2 micro-electrodes, particle tracking and microinjection of fluorescent dyes. The biofilms were found to consist of microbial clusters of cells and Extra-cellular Polymeric Substance (EPS) separated by interstitial voids. The cell clusters were ca 300 μm and the voids were ca 100 μm wide. The voids were open channels connected with the bulk fluid. Fluorescein micro-injection showed that liquid could flow through the voids, but was always stagnant in the cell clusters. Consequently, in voids both diffusion and convection may contribute to mass transfer, while in cell clusters transport is determined by diffusion only. Particle tracking with CSLM showed that flow velocity inside the biofilm was proportional to the bulk flow velocity. The importance of convective mass transport in biofilms was demonstrated by oxygen distribution measurements. At high flow velocities of the bulk liquid, the mass boundary layer followed the irregular biofilm surface. At lower velocities the mass boundary layer was parallel to the substratum. Mass transfer from voids to cell clusters increased with flow velocity, as result from vonvective mass transport from the bulk to the voids. Convective transport was insignificant at low flow velocities, but at high flow velocities it increased the total mass transport by 200-250%. The local diffusion coefficients in biofilms were measured using microinjection of fluorescent dyes and quantitative analysis of the subsequent plume formation using CSLM. The diffusion coefficient of small, non-binding molecules in cell clusters is close to that in water. Very large molecules were impeded in their diffusion through the biofilm matrix. It was calculated that the cell cluster matrix had the characteristics of a gel network with pore diameters of 80 nm.

Performance Evaluation of the Carbon Dioxide Corrosion Inhibitor IMC-1

2014 ◽  
Vol 490-491 ◽  
pp. 150-154
Author(s):  
Zhen Zhong Fan ◽  
Hui Ming An ◽  
Shu Yi Wang ◽  
Jun Feng Yang
Keyword(s):  
Carbon Dioxide ◽  
Corrosion Rate ◽  
Corrosion Inhibitor ◽  
Caprylic Acid ◽  
Acid Amide ◽  
Steel Corrosion ◽  
Electrode Reaction ◽  
Carbon Dioxide Corrosion ◽  
Electrochemical Polarization ◽  
N80 Steel

The carbon dioxide corrosion inhibitor IMC-1 was composed by caprylic acid amide polyoxyethylene ethers (n=4-5) and a small amount of the TX-10(5%). When the concentration was 200 mg/L, N80 steel corrosion rate was less than 0.125mm/a. With the CO2 partial pressure and temperature increased, N80 steel corrosion rate was decreased. From the electrochemical polarization curve, the adding corrosion inhibitor prevented the electrode reaction. The corrosion inhibitor IMC-1 was anodic inhibitor.

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