DNS of turbulent heat transfer in channel flow with low to medium-high Prandtl number fluid

1998 ◽  
Vol 19 (5) ◽  
pp. 482-491 ◽  
Author(s):  
Hiroshi Kawamura ◽  
Kouichi Ohsaka ◽  
Hiroyuki Abe ◽  
Kiyoshi Yamamoto
Keyword(s):  
Heat Transfer ◽  
Prandtl Number ◽  
Channel Flow ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
High Prandtl Number

Turbulent Heat Transfer in Plane Couette Flow

2004 ◽  
Author(s):  
Phuong M. Le ◽  
Dimitrios V. Papavassiliou
Keyword(s):  
Heat Transfer ◽  
Flow Field ◽  
Prandtl Number ◽  
Couette Flow ◽  
Channel Flow ◽  
Turbulent Dispersion ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Turbulence Structure ◽  
Plane Couette Flow

Direct numerical simulations of a turbulent plane Couette flow are combined with Lagrangian scalar tracking of thermal markers that are released in the flow field to determine the behavior of an instantaneous scalar line source located at the wall. The resulting probability density functions are used to calculate the behavior of instantaneous line sources of heat at the wall of the channel. The method is applied for fluids with a range of molecular Prandtl number, Pr, between 0.1 and 15,000, giving emphasis on the high Pr cases. The issues that are investigated are the effect of the Pr on turbulent dispersion, and the effect of the turbulence structure on turbulent heat transfer. The flow field for plane Couette flow is fundamentally different than that for channel flow, because the whole Couette flow domain is a constant stress region that forms an extensive logarithmic layer. For an instantaneous source at the wall, it is found that in both the channel flow and the Couette flow cases there are similar stages of development of the marker cloud that depend on the Prandtl number. This dependence becomes stronger as the Pr increases. However, this similarity is only qualitative.

Influence of Rheological Parameters on Turbulent Heat Transfer in Drag-Reducing Viscoelastic Channel Flow

2010 ◽  
Author(s):  
Takahiro Tsukahara ◽  
Takahiro Ishigami ◽  
Junya Kurano ◽  
Yasuo Kawaguchi
Keyword(s):  
Heat Transfer ◽  
Prandtl Number ◽  
Channel Flow ◽  
Reduction Rate ◽  
Turbulent Channel Flow ◽  
Weissenberg Number ◽  
Turbulent Heat Transfer ◽  
Rheological Parameters ◽  
Uniform Heat Flux ◽  
Turbulent Heat

Direct numerical simulations (DNS) of a drag-reducing viscoelastic turbulent channel flow with heat transfer had been carried out for three kinds of rheologically different fluids (e.g., different values of Weissenberg number). The molecular Prandtl number was set to be 0.1–2.0. A uniform heat-flux condition was employed as the thermal boundary condition. In this paper, we present various statistical turbulence quantities including the mean and fluctuating temperatures, the Nusselt number (Nu), and the cross-correlation coefficients and discuss about their dependence on the rheological parameters and the Prandtl-number dependency of the obtained drag-reduction rate and heat-transfer reduction rate.

The influence of a magnetic field on turbulent heat transfer of a high Prandtl number fluid

2007 ◽  
Vol 32 (1) ◽  
pp. 23-28 ◽  
Author(s):  
H. Nakaharai ◽  
J. Takeuchi ◽  
T. Yokomine ◽  
T. Kunugi ◽  
S. Satake ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Prandtl Number ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
High Prandtl Number
Sign in / Sign up

Export Citation Format

Share Document