Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 7 of 7 for “"reattachment length"”.
-
Mixed convection in laminar/turbulent separated backward-facing step flows
… the pressure drop across the duct along with the reattachment length and increases the heat transfer rate. The reverse of previous trend applies for the buoyancy-opposing flow condition. A larger buoyancy force in buoyancy-assisting turbulent flow will decrease turbulent kinetic energy, increase …
-
Experimental study of turbulent boundary layer flows over forward facing steps with different surface conditions.
… were employed. The results show that the mean reattachment length increases as Reynolds number increases over the smooth step. However, the mean reattachment length decreases with increasing surface roughness at a given Reynolds number. The mean velocities, Reynolds stresses, triple velocity …
-
Experimental and numerical studies of flows over forward facing steps in pressure gradients
… models in ANSYS Fluent were used to study the reattachment length XL for blockage ratios from 5.8% to 29.5% and step inclination angles from 22.5˚ to 135˚. The experimental results show that XL increases with the increase in Reynolds number without APG, but remains nearly constant for …
-
Flow and Heat Transfer in Tubes with Obstacles
… of bulk Reynolds number. Measurements of the reattachment length downstream from flow obstacles indicated that the reattachment length for three-dimensional turbulent flow around square-shaped cylinders was significantly shorter than two-dimensional flow over a backward-facing step. An …
-
Three-dimensional turbulence mechanisms in a supersonic separated/reattaching longitudinal cylinder wake
… upstream of, and in the immediate vicinity of reattachment of the separated shear layer, as these mechanisms are the main drivers of critical flow properties, such as the low pressure in the separated region. This work was experiment-based, utilizing non-intrusive optical measurement …
-
Scour in regions of flow separation with free-surface effects
… Fixed bed surface flow experiments showed that reattachment length, X<sub>R</sub>, increases with decreasing wave height, attaining a peak value of X<sub>R</sub>/h<sub>brink</sub> of approximately 12 as the tailwater elevation approaches the upstream critical depth water surface elevation. For …
-
The flow structure of interacting barchan dunes
… is characterized by smaller separation zone lengths, and smaller turbulence intensities, than the ‘splitting’ behavior. In this case, it is speculated the potential for downstream erosion is reduced and the downstream barchan maintains its morphology.