Experimental and numerical studies have been conducted on the effects of bed roughness elements such as cubic T-section that are regularly half-channel arrayed one side river turbulent flow characteristics erosion downstream elements. The experimental study has done for two types (cubic shape) to effect these velocity profile with respect different water discharges depths. A comparison between ...

This study describes the surface roughness of heat-treated Ti6Al4V ELI samples without finishing (as-built condition) depending on position build plate. Surface was studied at top and side surfaces horizontal vertical using a profilometer Scanning Electron Microscopy. Morphology tested is shown. It shown that had different morphologies, but they fairly close values, since formation mainly assoc...

1. Habitat heterogeneity in lotic systems is usually associated with the availability of refuges. Heterogeneous habitats (here, rough substrata) should mediate the effect of high-flow disturbances by protecting benthic algae, thus increasing the resistance and resilience of the system. Additionally, the ability of algae to resist a disturbance and recover after it should be dependent on biologi...

Abstract Optimization of all the process parameters for laser powder bed fusion (L-PBF), considering effects individual on Ti6Al4V fabricated parts, can be complex and challenging. Therefore, first time, three main variable (laser power, scan speed, hatch spacing) outcomes (surface roughness, bulk porosity, production rate parts) were studied in this work. Then, combination above-mentioned form...

Abstract Flow in rivers and the coastal ocean is controlled by frictional force exerted on water riverbed or seabed roughness. The typically characterized a drag coefficient C d , which estimated from bulk measurements often assumed constant. Here, we demonstrate relationship between bed roughness surface turbulence that can be used to make remote estimates of . We observe regions with larger r...

Due to gravity, drilling cuttings are easily accumulated in an inclined well section, ultimately forming a bed, which places the drill pipe under strong friction torque. In severe cases, this can cause dragging, stuck drills, and broken tools. Because conventional fluids difficult prevent formation of sections, method carrying with pulsed fluid improve wellbore cleanness is proposed. Experiment...

The routing of bed material through channels is poorly understood. We approach the problem by observing and modeling the fate of a low-amplitude sediment wave of poorly sorted sand that we introduced into an experimental channel transporting sediment identical to that of the introduced wave. The wave essentially dispersed upstream and downstream without translation, although there was inconclus...