الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 95 |  |  |
| | | from | 95 | | |
Abstract
In this study the rate of mass transfer diffusion controlled corrosion for a rotating shaft in agitated vessel was investigated in absence and presence of suspended inert particles, the system used is dissolution of copper in acidified potassium dichromate solution. Rate of mass transfer was measured under different conditions of the following variables; Impeller rotation speed ranged from (100-800) rpm, Impeller geometry, Concentration of sulfuric acid (0.5-2 M). where the rate of mass transfer increased with increasing impeller rotation speed range and increasing of concentration of sulfuric acid (from experimental part k value at 100 rpm for axial shaft =2.314*10-3 cm/sec but k value at 800 rpm for axial shaft =4.903*10-3 cm/sec at 0.5M sulfuric acid) and dimensional analysis method was used to determine an overall mass transfer correlation for the system to be used in designing and operating rotating shafts in agitated vessels. The obtained correlation are: Sh=4.723 Sc0.33 Re0.307 for axial flow, average deviation is ±9.42 % Sh=4.235 Sc0.33 Re0.319 for radial flow, average deviation is ±11.33 % On using a suspension of fine solid particles, the mass transfer coefficient increases obtained general correlation is: Sh=0.0961Sc0.33Re0.662 for radial flow, average Deviation of ±3.1%