Results 1 to 10 of about 102,404 (168)

On the critical Richardson number in stably stratified turbulence

Atmospheric Science Letters, 2007
AbstractThe critical Richardson number, Ric, is used in studies of stably stratified turbulence as a measure of flow laminarization. The accepted range of Ric is between 0.2 and 1. A growing body of experimental and observational data indicates, however, that turbulence survives for Ri ≫ 1.
Boris Galperín, Semion Sukoriansky
exaly   +3 more sources

Study of Some Stability Parameters in the Atmosphere of Oil Al-Dura Refinery, Southeast Baghdad [PDF]

Nature Environment and Pollution Technology, 2023
Wind and temperature measurements at an oil refinery site located southeast of Baghdad city at two levels, 15 and 30 m, are presented. Three schemes are used to determine different stability classifications: Monin-Obukhov length, gradient, and bulk ...
Farant H. S. Lagenean, Salwa S. Naif and Monim H. Al-Jiboori
doaj   +1 more source

Antarctic atmospheric Richardson number from radiosonde measurements and AMPS [PDF]

Atmospheric Chemistry and Physics, 2023
Monitoring a wide range of atmospheric turbulence over the Antarctic continent is still tricky, while the atmospheric Richardson number (Ri; a valuable parameter which determines the possibility that turbulence could be triggered) is easier to obtain ...
Q. Yang, Q. Yang, Q. Yang, X. Wu, X. Wu, X. Wu, X. Hu, X. Hu, X. Hu, Z. Wang, Z. Wang, C. Qing, C. Qing, C. Qing, T. Luo, T. Luo, T. Luo, P. Wu, P. Wu, P. Wu, X. Qian, X. Qian, X. Qian, Y. Guo, Y. Guo, Y. Guo   +25 more
doaj   +1 more source

Mixed Convection Heat Transfer and Entropy Generation in a ‎Water-filled Square Cavity Partially Heated from Below: The ‎Effects of Richardson and Prandtl Numbers [PDF]

Journal of Applied and Computational Mechanics, 2022
In the present study, fluid flow, heat transfer, and entropy generation for mixed convection inside a water-filled square cavity were investigated numerically.
Nawal Ferroudj, Hasan KÖTEN, Saadoun Boudebous   +2 more
doaj   +1 more source

Numerical Study of fluid flow and heat transfer of mixed convection and entropy generation in a L-shaped cavity filled with nanofluid [PDF]

مجله مدل سازی در مهندسی, 2017
In this work, the fluid flow and heat transfer and entropy generation of mixed convection in "Γ" -shaped cavity filled with Al2O3-Water-EG have been studied. For this propose, we used from a FORTRAN program based on finite volume method (FVM) and SIMPER
Ali Akbar Abbasian Arani, Alireza Aghaee, Alireza Aghaee, Zahra Ghahfarokhi   +3 more
doaj   +1 more source

Numerical Investigation of Nanofluid Mixed Convection and Entropy Generation in an Inclined Ventilating Cavity [PDF]

Journal of Nanostructures, 2012
This paper presents results of a numerical study of mixed convection and entropy generation of Cu–water nanofluid in a square ventilating cavity at different inclination angles. Except a piece of bottom wall with a uniform heat flux, all of the cavity
H. Khorasanizadeh, J. Amani, M. Nikfar, M. Hemmat   +3 more
doaj   +1 more source

Effect of the Richardson Number on Flow and Heat Transfer in a Cylinder Filled with Cu-Water Nano-fluid at Different Nanoparticle Concentrations

Journal of Applied Sciences and Environmental Management, 2022
Fluid circulation and thermal exchange properties via integrated natural and artificial convection within a container have attracted considerable interest due to its many industrial uses.
E. O. Sangotayo, J. O. Ogidiga
doaj   +1 more source

Mixed Convection from Tandem Semi-Circular Cylinders Arranged in a Vertical Channel [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2023
Semi-circular cylinders provide better space economy than circular and other non-circular cylinders. The cylinders are frequently used in a tandem arrangement in heat transfer equipment.
Rakesh Gupta, Avinash Chandra, Raj Gupta
doaj   +1 more source

Study of mixed convection in a horizontal cylindrical pipe partially filled with a porous medium saturated with a single fluid

Revue des Énergies Renouvelables, 2022
The three-dimensional numerical simulation of laminar mixed convection heat transfer with and without porous medium in a cylindrical duct was carried out in this study. The cylinder is divided into three parts. The first and the third parts are adiabatic,
Amira Houichi, Hassina Ghodbane, Azeddine Soudani   +2 more
doaj   +1 more source

The instability of stratified flows at large Richardson numbers [PDF]

Proceedings of the National Academy of Sciences, 1998
In contrast to conventional expectations based on the stability of steady shear flows, elementary time-periodic stratified flows that are unstable at arbitrarily large Richardson numbers are presented here. The fundamental instability is a parametric one with twice the period of the basic state.
Madja, Andrew J., Shefter, Michael
openaire   +2 more sources