The solar torsional oscillations are considered as the response of the Reynolds stress to the time-dependent dynamo-induced magnetic eld. This picture is opposite to the so far accepted idea that it is the large-scale Lorentz force which directly drives the temporal variations of the surface rotation proole. Here, the \magnetic quenching" of the components of the Reynolds stress { viscosity ten...

We report experiments on convection patterns in a cylindrical cell with a large aspect ratio. The fluid had a Prandtl number σ ≈ 1. We observed a chaotic pattern consisting of many rotating spirals and other defects in the parameter range where theory predicts that steady straight rolls should be stable. The correlation length of the pattern decreased rapidly with increasing control parameter s...

We report experiments on convection patterns in a cylindrical cell with a large aspect ratio. The uid had a Prandtl number 1. We observed a chaotic pattern consisting of many rotating spirals and other defects in the parameter range where theory predicts that steady straight rolls should be stable. The correlation length of the pattern decreased rapidly with increasing control parameter so that...

Molecular dynamics simulations are used to examine the effect of interfacial species mixing on the thermal conductivity of Stillinger-Weber Si /Si0.7Ge0.3 and Si/Ge superlattices at a temperature of 500 K. The thermal conductivity of Si /Si0.7Ge0.3 superlattices is predicted to not depend on the interfacial species mixing and to increase with increasing period length. This period length depende...

Two-equation turbulence models, such as the k–epsilon (k–ε) and shear stress transport (SST) have limited accuracy in calculating film cooling effectiveness. Previous studies focused on modifying turbulent Prandtl number from perspective of thermal diffusion to improve prediction simulations. However, flow jet is crucial for simulating cooling. The calculated effectiveness differs experimental ...

A grid of numerical simulations of double-diffusive convection is presented for the astrophysical case where viscosity (Prandtl number Pr) and solute diffusivity (Lewis number Le) are much smaller than the thermal diffusivity. As in laboratory and geophysical cases convection takes place in a layered form. The proper translation between subsonic flows in a stellar interior and an incompressible...

In many microreactors, reactant flows are split into many lamination segments and then fed into the reactor to enhance mixing efficiency. This feeding method is applied since mixing in microreactors is mainly driven by diffusion because of low Reynolds and thus the mixing time is proportional to the square of diffusion length. The mixing efficiency of reactants greatly influences the product co...

• DNS of PRB flow for low Prandtl number fluid. The influence Pr in has been studied with varying Pr. Turbulence is enhanced decreasing number. Extensive results and temperature statistics are analyzed presented. Direct numerical simulation (DNS) performed to study turbulent heat transfer Poiseuille-Rayleigh-Bénard (PRB) flows numbers this article. mesh Cartesian a highly accurate finite differ...

In the present work an experimental investigation was conducted to obtain a correlation for the determination of convective heat transfer coefficients of stirred yoghurt in a plate heat exchanger. A rheological study was carried out in order to characterise the stirred yoghurt flow behaviour, evaluating its dependency both on shear rate and temperature. A shift in the temperature dependency was...