Turbulence modulation and heat transfer enhancement in channels roughened by cube-covered surface. (English) Zbl 1390.76737
Summary: Direct numerical simulations are carried out to study turbulence modification and heat transport augmentation in rough channels with minor cubes on one wall. To account for the effect of the cubes on momentum and heat transfer in wall-bounded turbulent flows, the lattice Boltzmann method which is based on a double-distribution-function and D3Q19 model is applied to perform the numerical computation. The present study focuses on the modulations of the temperature field and heat transfer process by rough wall with different cube heights. Some typical dynamic and thermal statistics, such as the mean velocities, mean temperature, velocity fluctuations, the Reynolds stresses, and turbulent heat flux are analyzed. The similar trend of temperature and velocity roughness functions illustrates there is strong correlation between the heat transfer augmentation and a drag increase in rough channel flows. A significant heat transfer enhancement (26%, by taking into account the drag consumption) is obtained with the medium-height cubes.
MSC:
| 76M28 | Particle methods and lattice-gas methods |
| 65M75 | Probabilistic methods, particle methods, etc. for initial value and initial-boundary value problems involving PDEs |
| 76D05 | Navier-Stokes equations for incompressible viscous fluids |
| 76Fxx | Turbulence |
Keywords:
heat transfer augmentation; three-dimensional roughness; lattice Boltzmann method; direct numerical simulation; wall-bounded turbulenceReferences:
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