Experimental investigation on heat transfer in laminar, transitional and turbulent circular pipe flow with respect to flow regime boundaries

2019 ◽  
Vol 145 ◽  
pp. 118746 ◽  
Author(s):  
Dirk Bertsche ◽  
Paul Knipper ◽  
Konstantin Kapfer ◽  
Thomas Wetzel
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Flow Regime ◽  
Pipe Flow ◽  
Circular Pipe ◽  
Circular Pipe Flow

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.

scholarly journals Flow characteristics and circular pipe flow of pulp-suspension.

1990 ◽  
Vol 23 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Kohei Ogawa ◽  
Shiro Yoshikawa ◽  
Akira Suguro ◽  
Jun Ikeda ◽  
Hirohisa Ogawa
Keyword(s):  
Pipe Flow ◽  
Flow Characteristics ◽  
Circular Pipe ◽  
Circular Pipe Flow
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