Laser and electron beams are presently widely applied to many fields of material processing. Laser and electron beams produce the highest heat sources intensities used in welding process.This work investigates analytical comparison which discusses the differences and similarities between laser and electron beam welding.These comparisons have been made in three aspects. The first explains the main
The prediction of molar volume of saturated vapor can be calculated from many equations of state, some of these equations applied for both gas and liquid phase ,and some of them applied for gas phase only .
Turbulent drag-reduction efficiency of polyisobutylene with three different, very high molecular weights was studied in a build-up closed loop gas oil circulation system. The turbulent mode was produced via a positive displacement gear pump to avoid mechanical degradation of polymer chains during the experimental period. Three molecular weights 2.9*106 ,5.9*106 g/mol dissolved in reformate were used as additives in order to investigate the effect of molecular weight on drag-reduction rate and flow capacity increase.
