scholarly journals Effects of spatial gradients in thermophysical properties on the topology of turbulence in heated channel flow of supercritical fluids

2018 ◽  
Vol 30 (1) ◽  
pp. 015108 ◽  
Author(s):  
Chukwudi Azih ◽  
Metin I. Yaras
Keyword(s):  
Channel Flow ◽  
Supercritical Fluids ◽  
Thermophysical Properties ◽  
Spatial Gradients ◽  
Heated Channel

scholarly journals Effects of subfilter velocity modelling on dispersed phase in LES of heated channel flow

2011 ◽  
Vol 333 ◽  
pp. 012014 ◽  
Author(s):  
Jacek Pozorski ◽  
Maria Knorps ◽  
Mirosław Łuniewski
Keyword(s):  
Channel Flow ◽  
Dispersed Phase ◽  
Heated Channel

Velocity-temperature correlation in strongly heated channel flow

1995 ◽  
Vol 18 (6) ◽  
pp. 454-461 ◽  
Author(s):  
I. N. G. Wardana ◽  
T. Ueda ◽  
M. Mizomoto
Keyword(s):  
Channel Flow ◽  
Temperature Correlation ◽  
Heated Channel

Turbophoresis attenuation in a turbulent channel flow with polymer additives

2013 ◽  
Vol 732 ◽  
pp. 706-719 ◽  
Author(s):  
Arash Nowbahar ◽  
Gaetano Sardina ◽  
Francesco Picano ◽  
Luca Brandt
Keyword(s):  
Turbulent Flows ◽  
Channel Flow ◽  
Fluid Velocity ◽  
Turbulent Channel Flow ◽  
Typical Feature ◽  
Polymer Additives ◽  
Inertial Particles ◽  
Normal Fluid ◽  
Velocity Fluctuations ◽  
Spatial Gradients

AbstractTurbophoresis occurs in wall-bounded turbulent flows where it induces a preferential accumulation of inertial particles towards the wall and is related to the spatial gradients of the turbulent velocity fluctuations. In this work, we address the effects of drag-reducing polymer additives on turbophoresis in a channel flow. The analysis is based on data from a direct numerical simulation of the turbulent flow of a viscoelastic fluid modelled with the FENE-P closure and laden with particles of different inertia. We show that polymer additives decrease the particle preferential wall accumulation and demonstrate with an analytical model that the turbophoretic drift is reduced because the wall-normal variation of the wall-normal fluid velocity fluctuations decreases. As this is a typical feature of drag reduction in turbulent flows, an attenuation of turbophoresis and a corresponding increase in the particle streamwise flux are expected to be observed in all of these flows, e.g. fibre or bubble suspensions and magnetohydrodynamics.

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