ROMANI M., SOMMERIA J.
Vertical transport of horizontal momentum due to baroclinic instabilities is investigated in a rotating stratified fluid. The experiments were carried out in the large rotating tank of the Coriolis-LEGI laboratory in Grenoble with flat bottom and linear density stratification. The mean flow was generated by increasing (spin up) or decreasing (spin down) the rotation rate of the platform. The velocity fields were measured by PIV (Particle Image Velocimetry) technique. Our experimental study reveals two very different behaviors. For O(1) Burger numbers, the bulk of the flow remains axisymmetric with a very slow decay, described by the usual vertical diffusion law, except near the boundaries where Ekman pumping/suction occurs. For Burger numbers ≪ O(1), baroclinic instabilities are observed, leading to a much faster spin. Neither diffusion nor Ekman mechanisms can explain this enhanced momentum transport, interpreted instead as the effect of baroclinic instabilities. Eady’s theory is employed to analyze the quasi-geostrophic stability problem, and a model for estimating the azimuthal velocity decay is proposed. The results are presented and discussed.
@article{2bac364c-35c6-4dc0-8bb1-a760a7870aac,
title={Spin up/down in linearly stratified fluid},
author={ROMANI M. and SOMMERIA J.},
year={2007},
language={fr}
}TY - JOUR TI - Spin up/down in linearly stratified fluid AU - ROMANI M. AU - SOMMERIA J. PY - 2007 LA - fr ER -
TSHIJIKA MUNENGE Olivier, MUSASA KABEYA
La ville de Kolwezi fait face à une croissance démographique et industrielle rapide, entraînant une augmentation considérable de la production des déc
Pierre BLAZY, El-Aid JDID
La croissance industrielle durant le XXe siècle a nécessité des quantités considérables de métaux et, de ce fait, la mise en œuvre de procédés compati
DJESSE KABANGE Jessy, Jean-Marie KANDA NTUMBA
L'extraction par solvant du cuivre d'une solution de lixiviation suivie par l’électrolyse d’extraction est un procédé de concentration couramment renc
MBUYA MWASHI JOSUE, MUSENGA OMBA VENUS
Ce projet académique s'inscrit dans le cadre des études en métallurgie générale, visant à explorer les procédés d'extraction des métaux à partir de mi
A. Ryan, E. Johanson
The design of process plants for feasibility studies must address several key objectives, including feasibility and constructibility, while focusing o
David Pollard, Geoff Dunlop
The MetPlant 2008 conference focused on advancements in metallurgical processing of ores, emphasizing plant design, operation strategies, and innovati