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Numerical Heat Transfer And Fluid Flow

The transport of sand and dust by wind is a potent erosional force, creates sand dunes and ripples, and loads the atmosphere with suspended dust aerosols This article presents an extensive review of the physics of wind-blown sand and dust on Earth and Mars Specifically, we review the physics of aeolian saltation, the formation and development of sand dunes and ripples, the physics of dust aerosol emission, the weather phenomena that trigger dust storms, and the lifting of dust by dust devils and other small-scale vortices We also discuss the physics of wind-blown sand and dune formation on Venus and Titan

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The physics of wind-blown sand and dust

The transport of sand and dust by wind is a potent erosional force, creates sand dunes and ripples, and loads the atmosphere with suspended dust aerosols. This paper presents an extensive review of the physics of wind-blown sand and dust on Earth and Mars. Specifically, we review the physics of aeolian saltation, the formation and development of sand dunes and ripples, the physics of dust aerosol emission, the weather phenomena that trigger dust storms, and the lifting of dust by dust devils and other small-scale vortices. We also discuss the physics of wind-blown sand and dune formation on Venus and Titan.

/pdf/the-physics-of-wind-blown-sand-and-dust-4ggy9vm6xy.pdf

This article provides a review of recent progress in understanding and predicting polymer drag reduction (DR) in turbulent wall-bounded shear flows. The reduction in turbulent friction losses by the dilute addition of high–molecular weight polymers to flowing liquids has been extensively studied since the phenomenon was first observed over 60 years ago. Although it has long been reasoned that the dynamical interactions between polymers and turbulence are responsible for DR, it was not until recently that progress had been made to begin to elucidate these interactions in detail. These advancements come largely from numerical simulations of viscoelastic turbulent flows and detailed turbulence measurements in flows of dilute polymer solutions using laser-based optical techniques. This review presents a selective overview of the current state of the numerics and experimental techniques and their impact on understanding the mechanics and prediction of polymer DR. It includes a discussion of areas in which our ...

Mechanics and Prediction of Turbulent Drag Reduction with Polymer Additives

Geometry: shape, size, aspect ratio and orientation Flow Type: forced, natural, laminar, turbulent, internal, external Boundary: isothermal (Tw = constant) or isoflux (q̇w = constant) Fluid Type: viscous oil, water, gases or liquid metals Properties: all properties determined at film temperature Tf = (Tw + T∞)/2 Note: ρ and ν ∝ 1/Patm ⇒ see Q12-40 density: ρ ((kg/m) specific heat: Cp (J/kg ·K) dynamic viscosity: μ, (N · s/m) kinematic viscosity: ν ≡ μ/ρ (m/s) thermal conductivity: k, (W/m ·K) thermal diffusivity: α, ≡ k/(ρ · Cp) (m/s) Prandtl number: Pr, ≡ ν/α (−−) volumetric compressibility: β, (1/K)

Convection Heat Transfer

The paper reports on the application of the Time-dependent Reynolds-Averaged Navier-Stokes (T-RANS) approach to analysing the effects of magnetic force and bottom-wall configuration on the reorganisation of a large coherent structure and its role in the transport processes in Rayleigh-Benard convection. The large-scale deterministic motion is fully resolved in time and space, whereas the unresolved stochastic motion is modelled by a `subscale' model for which the conventional algebraic stress/flux expressions were used, closed with the low-Re number - - three-equation model. The applied method reproduces long-term averaged mean flow properties, turbulence second moments, and all major features of the coherent roll/cell structure in classic Rayleigh-Benard convection in excellent agreement with the available DNS and experimental results. Application of the T-RANS approach to Rayleigh-Benard convection with wavy bottom walls and a superimposed magnetic field yielded the expected effects on the reorganisation of the eddy structure and consequent modifications of the mean and turbulence parameters and wall heat transfer.

/pdf/statistical-structure-at-the-wall-of-the-high-reynolds-1hh7xpx686.pdf

Statistical Structure at the Wall of the High Reynolds Number Turbulent Boundary Layer

Contribution to elliptic relaxation modelling of turbulent natural and mixed convection

The effect of oxygen on transitional Marangoni flow in laser spot welding

We report on recent developments in modelling and numerical computations of natural and mixed convection based on newly developed quasi-linear algebraic heat flux and buoyancy extended stress models in the framework of the eddy-viscosity elliptic-relaxation approach. The DNS based 'a priori' testing of generic cases of turbulent natural convection (the side- and heated-from-below configurations) demonstrated that significant improvements are obtained in predictions of turbulent heat flux components when compared with more conventional proposals from the literature [including simple- and generalized gradient diffusion hypotheses (SGDH, GGDH), as well as algebraic flux models (AFM)]. The five equations (k-e-v 2 -f-θ 2 ) model is then applied to the computation of several 2D and 3D natural and mixed convection flows in turbulent regime

Sasa Kenjeres

Papers

Statistical Structure at the Wall of the High Reynolds Number Turbulent Boundary Layer

Contribution to elliptic relaxation modelling of turbulent natural and mixed convection

The effect of oxygen on transitional Marangoni flow in laser spot welding

Contribution to elliptic relaxation modelling of turbulent natural and mixed convection

Natural convection in partitioned two-dimensional enclosures at higher Rayleigh numbers