D224 Effects of Orifice Diameter on Corrosion Rate of the Flow Accelerated Corrosion downstream of an Orifice

2012 ◽  
Vol 2012.17 (0) ◽  
pp. 377-378
Author(s):  
Yukinori NAGAYA ◽  
Yoichi UTANOHARA ◽  
Akira NAKAMURA ◽  
Michio MURASE
Keyword(s):  
Corrosion Rate ◽  
Orifice Diameter ◽  
Accelerated Corrosion ◽  
Flow Accelerated Corrosion

Prediction of corrosion rates of a ship under the flow accelerated corrosion mechanism

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yingwei Liu ◽  
Haodian Liu
Keyword(s):  
Corrosion Rate ◽  
Flow Field ◽  
Oxygen Concentration ◽  
Great Influence ◽  
Bottom Surface ◽  
Final Conclusion ◽  
Corrosion Mechanism ◽  
Accelerated Corrosion ◽  
Corrosion Model ◽  
Flow Accelerated Corrosion

Abstract In order to reveal the corrosion of a ship hull in flowing seawater, which is difficult to study under experimental conditions, a numerical method was adopted. Firstly, the numerical model of seawater flow field around the hull was established and computed, and the hydraulic characteristics of the flow field such as velocity, pressure, and oxygen concentration distribution were got. The distribution of oxygen has a great influence on corrosion. Generally speaking, where the oxygen concentration is higher, the corrosion rate is higher. The results show that the oxygen concentration is higher at the rear of the hull bottom surface. Next, a corrosion model was founded based on the above calculation. Through the calculation of the corrosion model, the mass transfer coefficient and corrosion rate distribution on the hull surface were obtained and the final conclusion was got flow accelerated corrosion (FAC) mechanism was revealed. The conclusion is as follows: Comparatively speaking, the corrosion rate of the middle and rear part of the bottom and the middle part of the sideboard is higher. Generally speaking, the corrosion rate increases with the increase of flow rate.

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