We present measurements of the Nusselt number N as a function of the Rayleigh number R and the Prandtl number sigma in cylindrical cells with aspect ratios gamma = 0.5 and 1.0. We used acetone, methanol, ethanol, and 2-propanol with Prandtl numbers sigma = 4.0, 6.5, 14.2, and 34.1, respectively, in the range 3x10(7) less, similarR less, similar10(11). At constant R, N(R,sigma) varies with sigma...

Turbulent rotating convection in a cylinder is investigated both numerically and experimentally at Rayleigh number Ra = 10 and Prandtl number σ = 6.4. In this Letter we discuss two topics: the breakdown under rotation of the domain-filling large-scale circulation (LSC) typical for confined convection, and the convective heat transfer through the fluid layer, expressed by the Nusselt number. The...

The oscillating onset of the Rayleigh–Bénard convection with viscoelastic fluids in a slightly tilted two-dimensional rectangular cavity an aspect ratio Γ = 2 was investigated for first time via direct numerical simulation. A series simulations were conducted plane Rayleigh number (Ra) and tilt angle (α∈[0°, 5°]) three Weissenberg numbers [Wi=(0.1,0.15,0.2)] at fixed Prandtl Pr 7.0. evolutionar...

A Lattice Boltzmann method is applied to demonstrate the comparison results of simulating natural convection in an open end cavity using different hydrodynamic and thermal boundary conditions. The Prandtl number in the present simulation is 0.71, Rayleigh numbers are 104,105 and 106 and viscosities are selected 0.02 and 0.05. On-Grid bounce-back method with first-order accuracy and non-slip met...

A liquid film flowing under an inclined substrate exhibits the well-known Rayleigh-Taylor instability. Here we show, using long-wave theory and stability analysis, that this instability can be modulated by adjusting temperature. In particular, derive analytically two critical (composite) Marangoni numbers delineating stable, convectively unstable, absolutely unstable regions, which is also veri...

The major Objective of simulating the radio propagation channels is to substantiate the design and performance of wireless communication systems. In the early stage of analysis and performance of wireless transceiver design fading channel simulators plays a vital role. The software simulators are painless to design, where as various hardware simulators have been proved that they offer distinct ...

Double-diffusive convection in a micropolar fluid layer heated and soluted from below in the presence of uniform rotation saturating a porous medium is theoretically investigated. An exact solution is obtained for a flat fluid layer contained between two free boundaries. To study the onset of convection, a linear stability analysis theory and normal mode analysis method have been used. For the ...