corrosion & water flow patterns 1

[unicornio]

I am trying to find something related to corrosion on boats on seawater, especifically I wonder if there is a way to stablish a relationship between the water-flow pattern below the boat and the configuration of anodes to prevent corrosion...I can get flow patterns by a STAR-CD analysis, I just want to know the relationship.

 

[kmuhsen]

Hi <br>If we are talking about the corrosion which is due to friction between water boundary layer and boat body, then you have to find the water boundary lyer velocity profile over the boat body, then apply Newton low of viscosity (T= M x dv\dn )Where :<br>T:Shear stress<br>M: water viscosity<br>dv\dn :velocity derivative to boundary layer thickness.<br>Then you can integerate the sher stress over the area to find whats called drag force (skin friction) which caused the corrosion.<br><br>You can go to a less accuracy formula which leads to :<br>Drag force = Cf x 1/2 x water density x A x V^2 where :<br>Cf : 1.328 / ( Re )^0.5 ( palte coefficient of skin drag)<br>Re : Plate Reynolds number.<br>A: Plate area.<br>V: velocity just out side the boundary layer.<br><br>I hope the above is helpful <br><br>BYYY<br><br><br><br>