The effect of interfacial waves on the turbulence structure of stratified air/water pipe flow

2016 ◽  
Vol 78 ◽  
pp. 104-116 ◽  
Author(s):  
A.A. Ayati ◽  
J. Kolaas ◽  
A. Jensen ◽  
G.W. Johnson
Keyword(s):  
Pipe Flow ◽  
Turbulence Structure ◽  
Water Pipe ◽  
Interfacial Waves

Scaling laws for pipe-flow turbulence

1975 ◽  
Vol 67 (2) ◽  
pp. 257-271 ◽  
Author(s):  
A. E. Perry ◽  
C. J. Abell
Keyword(s):  
Pipe Flow ◽  
Scaling Laws ◽  
Dynamic Calibration ◽  
Turbulence Structure ◽  
Mean Flow ◽  
Number Range ◽  
Static Calibration ◽  
Calibration Methods ◽  
The Mean ◽  
Flow Turbulence

Using hot-wire-anemometer dynamic-calibration methods, fully developed pipe-flow turbulence measurements have been taken in the Reynolds-number range 80 × 103 to 260 × 103. Comparisons are made with the results of previous workers, obtained using static-calibration methods. From the dynamic-calibration results, a consistent and systematic correlation for the distribution of turbulence quantities becomes evident, the resulting correlation scheme being similar to that which has previously been established for the mean flow. The correlations reported have been partly conjectured in the past by many workers but convincing experimental evidence has always been masked by the scatter in the results, no doubt caused by the difficulties associated with static-calibration methods, particularly the earlier ones. As for the mean flow, the turbulence intensity measurements appear to collapse to an inner and outer law with a region of overlap, from which deductions can be made using dimensional arguments. The long-suspected similarity of the turbulence structure and its consistency with the established mean-flow similarity appears to be confirmed by the measurements reported here.

scholarly journals Laminar–Turbulent Intermittency in Annular Couette–Poiseuille Flow: Whether a Puff Splits or Not

Entropy ◽  
2020 ◽  
Vol 22 (12) ◽  
pp. 1353
Author(s):  
Hirotaka Morimatsu ◽  
Takahiro Tsukahara
Keyword(s):  
Poiseuille Flow ◽  
Pipe Flow ◽  
Large Scale ◽  
Outer Cylinder ◽  
Base Flow ◽  
Circular Pipe ◽  
Turbulence Structure ◽  
Transitional Regime ◽  
Circular Pipe Flow ◽  
Observation Period

Direct numerical simulations were carried out with an emphasis on the intermittency and localized turbulence structure occurring within the subcritical transitional regime of a concentric annular Couette–Poiseuille flow. In the annular system, the ratio of the inner to outer cylinder radius is an important geometrical parameter affecting the large-scale nature of the intermittency. We chose a low radius ratio of 0.1 and imposed a constant pressure gradient providing practically zero shear on the inner cylinder such that the base flow was approximated to that of a circular pipe flow. Localized turbulent puffs, that is, axial uni-directional intermittencies similar to those observed in the transitional circular pipe flow, were observed in the annular Couette–Poiseuille flow. Puff splitting events were clearly observed rather far from the global critical Reynolds number, near which given puffs survived without a splitting event throughout the observation period, which was as long as 104 outer time units. The characterization as a directed-percolation universal class was also discussed.

Maximum density effect on laminar water pipe flow solidification

1998 ◽  
Vol 41 (24) ◽  
pp. 4251-4257 ◽  
Author(s):  
C.W. Tsai ◽  
S.J. Yang ◽  
G.J. Hwang
Keyword(s):  
Pipe Flow ◽  
Maximum Density ◽  
Density Effect ◽  
Water Pipe

Oil-Water Pipe Flow Dispersions - From Traditional Flow Loops to Real Industrial Transport Conditions

2017 ◽  
Author(s):  
Andrea Shmueli ◽  
Heiner Schümann ◽  
Tor Erling Unander
Keyword(s):  
Pipe Flow ◽  
Water Pipe ◽  
Oil Water

Characterization of linear interfacial waves in a turbulent gas-liquid pipe flow

2017 ◽  
Vol 29 (6) ◽  
pp. 062106 ◽  
Author(s):  
A. A. Ayati ◽  
P. S. C. Farias ◽  
L. F. A. Azevedo ◽  
I. B. de Paula
Keyword(s):  
Pipe Flow ◽  
Interfacial Waves

scholarly journals Numerical characterisation of slug flow in horizontal air/water pipe flow

2016 ◽  
Vol 4 (2) ◽  
pp. 114-130 ◽  
Author(s):  
Zahid I. Al-Hashimy ◽  
Hussain H. Al-Kayiem ◽  
Rune W. Time ◽  
Zena K. Kadhim
Keyword(s):  
Pipe Flow ◽  
Slug Flow ◽  
Water Pipe
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