Abstract
A new high pressure and temperature submerged impinging jet device is described. The experimental results of its flow characteristics are summarized. Local mass transfers on a Teflon disc normal to the jet with eight 1-mm diameter microelectrodes located at 0 < x/r < 3.8, where x is the distance from the stagnation point on the disc and r is the jet nozzle radius, were measured using the limiting current of potassium ferricyanide solution for 50 ≤ Reynolds number (Re) ≤ 4500 at a jet nozzle exit to disc height, H, to r ratio of 10. Flow transition from laminar to turbulent flow occurred at Re ≈ 800. The empirical relation between the local Sherwood number (Sh) and Re in the stagnation region and developing wall jet region gave two segmented linear correlations. The shear effects of the circular jet on flat carbon steel discs examined after 24 h exposure at Re = 780 showed significantly more material loss at x/r = 2.5. This coincided with the location where the local Sh obtained from the mass transfer measurements began to raise. The device is scalable and can generate a wide range of Re, enabling meaningful laboratory inhibitor and corrosion studies at high shear stress.
