Turbulence in Pipe Flows with Small Relative Roughness

2010 ◽  
pp. 33-42
Author(s):  
Alexander Smits ◽  
Sean C. C. Bailey ◽  
Rick L. Pepe ◽  
Michael P. Schultz
Keyword(s):  
Pipe Flows ◽  
Relative Roughness

Analysis of vortex core generation in pipe flows under different Reynolds number conditions

2021 ◽  
Vol 43 (6) ◽  
Author(s):  
F. J. Salvador ◽  
M. Carreres ◽  
P. Quintero ◽  
L. A. González-Montero
Keyword(s):  
Reynolds Number ◽  
Vortex Core ◽  
Pipe Flows

Radial pressure forces in Euler-Euler simulations of turbulent bubbly pipe flows

2021 ◽  
Vol 374 ◽  
pp. 111079
Author(s):  
Roland Rzehak ◽  
Yixiang Liao ◽  
Richard Meller ◽  
Fabian Schlegel ◽  
Ronald Lehnigk ◽  
...  
Keyword(s):  
Radial Pressure ◽  
Pipe Flows

scholarly journals Perspective on the Response of Turbulent Pipe Flows to Strong Perturbations

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 208
Author(s):  
Liuyang Ding ◽  
Tyler Van Buren ◽  
Ian E. Gunady ◽  
Alexander J. Smits
Keyword(s):  
Pipe Flow ◽  
Abrupt Change ◽  
Pipe Wall ◽  
Surface Condition ◽  
Initial Response ◽  
Body Of Revolution ◽  
Future Directions ◽  
Pipe Flows ◽  
Roughness Elements ◽  
Pipe Geometry

Pipe flow responds to strong perturbations in ways that are fundamentally different from the response exhibited by boundary layers undergoing a similar perturbation, primarily because of the confinement offered by the pipe wall, and the need to satisfy continuity. We review such differences by examining previous literature, with a particular focus on the response of pipe flow to three different kinds of disturbances: the abrupt change in surface condition from rough to smooth, the obstruction due to presence of a single square bar roughness elements of different sizes, and the flow downstream of a streamlined body-of-revolution placed on the centerline of the pipe. In each case, the initial response is strongly influenced by the pipe geometry, but far downstream all three flows display a common feature, which is the very slow, second-order recovery that can be explained using a model based on the Reynolds stress equations. Some future directions for research are also given.

Velocity profiles in constant-acceleration pipe flows

1988 ◽  
Author(s):  
PAUL LEFEBVRE ◽  
KENNETH LAPOINTE
Keyword(s):  
Velocity Profiles ◽  
Constant Acceleration ◽  
Pipe Flows

Numerical Study of Convective Heat Transfer From Expanding Annular Pipe Flows

2016 ◽  
Author(s):  
Khaled J. Hammad
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Prandtl Number ◽  
Convective Heat Transfer ◽  
Diameter Ratio ◽  
Wall Heat Transfer ◽  
Reattachment Point ◽  
Transfer Rates ◽  
Pipe Flows ◽  
Annular Pipe

Convective heat transfer from suddenly expanding annular pipe flows are numerically investigated within the steady laminar flow regime. A parametric study is performed to reveal the influence of the annular diameter ratio, k, the Prandtl number, Pr, and the Reynolds number, Re, over the following range of parameters: k = {0, 0.5, 0.7}, Pr = {0.7, 1, 7, 100}, and Re = {25, 50, 100}. Heat transfer enhancement downstream of the expansion plane is only observed for Pr > 1. Peak wall-heat-transfer-rates always appear downstream of the flow reattachment point, in the case of suddenly expanding round pipe flows, i.e. k = 0. However, for suddenly expanding annular pipe flows, i.e., k = 0.5 and 0.7, peak wall-heat-transfer-rates always appear upstream of the flow reattachment point. The observed heat transfer augmentation is more dramatic for suddenly expanding annular flows, in comparison with the one observed for suddenly expanding pipe flows. For a given annular diameter ratio and Reynolds number, increasing the Prandtl number, always results in higher wall-heat-transfer-rates downstream the expansion plane.

THE CÆSAR CODE FOR AEROSOL RESUSPENSION IN TURBULENT PIPE FLOWS. ASSESSMENT AGAINST THE STORM EXPERIMENTS

2000 ◽  
Vol 31 (9) ◽  
pp. 1061-1076 ◽  
Author(s):  
E Hontañón ◽  
A de los Reyes ◽  
J.A Capitão
Keyword(s):  
Pipe Flows

Rheological behavior of alcohol-resistant foam concentrates and its impact on pipe flows

2021 ◽  
Vol 121 ◽  
pp. 103289
Author(s):  
Youquan Bao ◽  
Huiqiang Zhi ◽  
Lu Wang
Keyword(s):  
Rheological Behavior ◽  
Pipe Flows

scholarly journals THE STRUCTURE OF THE TURBULENCE IN TRANSIENT PIPE FLOWS

1976 ◽  
Vol 9 (6) ◽  
pp. 431-439 ◽  
Author(s):  
TOSHIRO MARUYAMA ◽  
TOSHIAKI KURIBAYASHI ◽  
TOKURO MIZUSHINA
Keyword(s):  
Pipe Flows
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