THEORETICAL ANALYSIS OF CORROSION FOR CARBON STEEL UNDER TWO PHASE FLOW CONDITIONS

إنجليزية
number: 
2048
Degree: 
Author: 
Mariam H. Fawzi
Supervisor: 
Prof. Dr. Qasim Jabar Slaiman
Dr. Basim Obead Hasan
year: 
2009

      For continuation of the experimental data of Atwan and Aziz, a theoretical analysis was carried out to show the influence of two phase flow on corrosion under two different temperatures 25 and 400 C. It is also aimed to understand the agitation of these two phase flow under different conditions at different agitation velocities.They used two liquids. These are water and kerosene.Water was used at different percentages of the total volume.These percentages range from 1% to 30%. The effect of agitation and water percentage on corrosion were studied and recorded. To evaluate the results, analysis of variance methods were used. This method indicates that at 250C the velocity of agitation impeller (Re) has a clear effect on corrosion, number of droplets per unit volume and on the diameter of these droplets.It has been found that the water percentage affects  corrosion rate and the diameter of droplets formed. On the other hand, it has been noticed that the water percentage has no effect on the number of droplets per unit volume. However, the effect of water percentage on corrosion rate found more than the effect of velocity of agitation. The same is true for the diameter of droplets formed.The analysis of variance at 400C indicates that the velocity of agitation affects the corrosion rate, number of droplets per unit volume and the diameter of droplets formed.The analysis of variance also indicates that the water percentage has more effect on corrosion rate while the velocity of agitation has more effect on the diameter of droplets formed.These findings are obtained from experimental results adopted in this analysis. It has been also found that the higher the temperature, the lesser corrosion takes place. The reason could be attributed to the fact that the temperature reduces the oxygen in aqueous phase therefore, reduces the corrosion rate. The placement of metal specimens in the agitation vessel is also important as found by the present analysis. The specimens close to the rotating impeller shaft are influenced differently from specimens placed at the wall of agitation vessel. This is because the intensity of turbullence and number of droplets per unit volume are not similar at different locations in the agitation vessel.

 

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