Experimental investigation of the heat and fluid flow of an Al2O3-water nanofluid in the laminar-turbulent transition region

2020 ◽  
Vol 158 ◽  
pp. 106546
Author(s):  
A. Briclot ◽  
J.F. Henry ◽  
C. Popa ◽  
C.T. Nguyen ◽  
S. Fohanno
Keyword(s):  
Experimental Investigation ◽  
Fluid Flow ◽  
Transition Region ◽  
Turbulent Transition ◽  
Heat And Fluid Flow ◽  
Laminar Turbulent Transition

scholarly journals Laminar-turbulent transition of a non-Newtonian fluid flow

2020 ◽  
pp. 1-15
Author(s):  
Adithya Krishnan Thota Radhakrishnan ◽  
Christian Poelma ◽  
Jules van Lier ◽  
Francois Clemens
Keyword(s):  
Fluid Flow ◽  
Newtonian Fluid ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition

Drag-Reducing Flows in Laminar-Turbulent Transition Region

2014 ◽  
Vol 136 (10) ◽  
Author(s):  
Shu-Qing Yang ◽  
Donghong Ding
Keyword(s):  
Transition Region ◽  
Reynolds Shear Stress ◽  
Flow Characteristics ◽  
Physical Nature ◽  
Weighting Factor ◽  
Intermittent Flow ◽  
Mean Velocity ◽  
Turbulent Transition ◽  
Intermittency Factor ◽  
Laminar Turbulent Transition

This study makes an attempt to investigate Newtonian/non-Newtonian pipe flows in a laminar-turbulent transition region, which is an extraordinarily complicated process and is not fully understood. The key characteristic of this region is its intermittent nature, i.e., the flow alternates in time between being laminar or turbulent in a certain range of Reynolds numbers. The physical nature of this intermittent flow can be aptly described with the aid of the intermittency factor γ, which is defined as that fraction of time during which the flow at a given position remains turbulent. Spriggs postulated that a weighting factor can be used to calculate the friction factor, applying its values in laminar and turbulent states. Based on these, a model is developed to empirically express the mean velocity and Reynolds shear stress in the transition region. It is found that the intermittency factor can be used as a weighting factor for calculating the flow structures in the transition region. Good agreements can be achieved between the calculations and experimental data available in the literature, indicating that the present model is acceptable to express the flow characteristics in the transition region.

On Methods of Experimental Investigation of the Laminar-Turbulent Transition at Transonic Velocities

1997 ◽  
Vol 32 (6) ◽  
pp. 793-797 ◽  
Author(s):  
V. I. Biryukov ◽  
V. D. Bokser ◽  
V. G. Mikeladze ◽  
G. K. Shapovalov
Keyword(s):  
Experimental Investigation ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition
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