Results 41 to 50 of about 102,404 (168)

Defining an appropriate range of scales for application of the gradient Richardson number, with implications for observations of stratified shear turbulence at laboratory and ocean scales

Frontiers in Marine Science
The Richardson number (Ri) represents the square of the ratio of buoyancy frequency to vertical shear, and a value less than ¼ has long been recognized as a necessary condition for the generation of turbulence, particularly at small scales.
Daniel G. MacDonald, Daniel G. MacDonald, Louis Goodman   +2 more
doaj   +1 more source

Experimental Study of Mixed Convection in an Enclosure with a Cold Movable Top Wall and Hot Bottom Wall

Al-Khawarizmi Engineering Journal, 2017
Mixed convection heat transfer to air inside an enclosure is investigated experimentally. The bottom wall of the enclosure is maintained at higher temperature than that of the top wall which keeps in oscillation motion, whereas the left and right walls ...
Nabil J. Yasin J. Yasin, Dhia Al-Deen H. Alwan, Ayad S. Abdulla   +2 more
doaj  

Numerical simulation of mixed convection heat transfer of nanofluid in a double lid-driven cavity using lattice Boltzmann method

Alexandria Engineering Journal, 2016
In this study, mixed convection heat transfer of water-Cu nanofluid in a double lid-driven cavity has been analyzed by lattice Boltzmann method. The double lid-driven are insulated and the side walls have sinusoidal temperature distribution.
Ahmad Reza Rahmati, Ali Rayat Roknabadi, Mahmoud Abbaszadeh   +2 more
doaj   +1 more source

Optimizing heat transport in a permeable cavity with an isothermal solid block: Influence of nanoparticles volume fraction and wall velocity ratio

Open Physics
This study examines the influence of wall velocity ratio on mixed convective heat transport in a permeable cavity containing an isothermal solid block at its center. The analysis considers the characteristics of various flow variables, i.e., Darcy number,
Rajarathinam Muthu, Khan Muhammad Ijaz, Abdullaeva Barno Sayfutdinovna, Abbas Tehseen, Awwad Fuad A., Ismail Emad A. A.   +5 more
doaj   +1 more source

The role of gravity wave in a nocturnal mountain rainstorm in the northeastern Sichuan Basin

暴雨灾害
Mountain gravity wave characteristics are important for analyzing the nighttime heavy rainfall events occurring in Sichuan. Based on the GPM satellite precipitation data, FY-4A satellite cloud data, and ERA5 reanalysis data, we analyze the mesoscale ...
Kejun WANG, Guoping LI, Jiaxu XIE, Haiwen LIU   +3 more
doaj   +1 more source

Upper limit for wind shear in stably stratified conditions expressed in terms of a bulk Richardson number

Meteorologische Zeitschrift, 2017
Profile measurements of wind and potential temperature from a land site (obtained by a RASS for several years) and an offshore site (obtained at the meteorological mast on the research platform FINO 1 for one year) are used to analyse the temporal ...
Stefan Emeis
doaj   +1 more source

Responses of saline water intrusion to sea level rise in the Yangtze Estuary

Shuili Shuiyun Gongcheng Xuebao, 2018
A 3D numerical model of hydrodynamic and salinity transport of the Yangtze Estuary under the influence of tide is established based on MIKE3 software. This model is validated with the field measured tidal level, flow velocity, flow magnitude and salinity.
CHEN Wei, KUANG Cuiping, GU Jie, HE Lulu
doaj   +1 more source

Second Law Analysis of Mixed Convection of Magnetohydrodynamic Flow in an Inclined Square Lid-Driven

Journal of Thermal Engineering, 2019
Second law of thermodynamics analysis is formulated for the case of laminar mixed convection in an inclined square lid-driven enclosure in the presence of magnetic field.
Elif BÜYÜK ÖĞÜT
doaj   +1 more source

A CURVATURE EFFECT ON THE CRITICAL RICHARDSON NUMBER

Hrvatski meteorološki časopis, 1994
Transitions from laminar to turbulent flow associated with a critical level in the stratified shear flow are related to the critical (gradient) Richardson number, Ric, the minimum value of which is Ric ≈ 1/4. Based on the linear theory and a modified Taylor-Goldstein equation, here it is plausibly shown that Ric may slightly vary from this value if the
openaire   +4 more sources

The dependence of the Richardson number on scale length

, 1967
July 1967. ; Sponsored by the National Environmental Satellite Center, ESSA WBG-59.
Reiter, Elmar R., author, Lester, Peter F., 1937-, author, Department of Atmospheric Science, Colorado State University, publisher   +2 more
openaire   +1 more source