الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
The present study addresses the problem of diffusion controlled impingement corrosion at the inlet of an annulus. The annular geometry is used in industry to design equipment such as double-tube heat exchangers, heterogeneous reactors, electrochemical reactors, eic. The present study was carried out by using an accelerated test which simulates actual impingement corrosion, namely the diffusion controlled dissolution of copper in acidified dichromate
The following variables were studied:
1-Solution How rate.
2-Inlet nozzle diameter.
3-Physical properties of the solution (viscosity, density and diffusivity)
In order to appreciate the severity of diffusion controlled corrosion at the inlet zone compared to other parts of the annulus, the rate ofcorrosion was also determined under developing and fully developed flow conditions. In addition, the present work aims at testing the .possibility of using drag reducing polymers such as corrosion inhibitors in the inlet zone Polyethylene oxide (Polyox WSR- 30 1) was used in different concentrations ranging from 100 ppm to ,”H)0 ppm to study its influence in decreasing the rate ofcorrosion