Drag reduction has been studied in a build-up closed loop water circulation system using two different types of polymers namely: carboxy methylcellulose CMC and Xanthan Gum, XG of molecular weight 0.4*106and 5.0*106g/mol respectively.The turbulent mode was produced via a positive displacement gear pump to avoid mechanical degradation of polymer chain during the experimented period.
The turbulent drag-reduction effectiveness of two anionicsurfactants, Sodium Dodecy -Benzene Sulfonate (SDBS) and Sodium laureth sulfate (SLES) has been studied in a build up closed loop water circulation system, the turbulent mode wasproduced via a positive displacement gear pump to avoidmechanical degradation surfactant molecules during theexperimental period. Drag- reduction results were assessed bymeasuring the pressure drop over 2m test section.
Because of the practical importance of galvanic corrosion arises the need to study the effect of corrosion inhibitors, area ratio of cathode to anode (Ac/A), rotational velocities of specimens on galvanic corrosion of several industrially important metals and also to follow the behavior of corrosion rate.
