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Titre du document / Document title

Dust flux within dust devils : Preliminary laboratory simulations

Auteur(s) / Author(s)

NEAKRASE Lynn D. V. (1) ; GREELEY Ronald (1) ; IVERSEN James D. (2) ; BALME M. R. (3) ; EDDLEMON Eric E. (4) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Geological Sciences, Arizona State University, Tempe, Arizona, ETATS-UNIS
(2) Department of Aerospace Engineering, Iowa State University, Ames, Iowa, ETATS-UNIS
(3) Department of Earth Sciences, Open University, Milton Keynes, ROYAUME-UNI
(4) Planetary Aeolian Facility, NASA Ames Research Center, Moffett Field, California, ETATS-UNIS

Résumé / Abstract

[1] Laboratory simulations using the Arizona State University Vortex Generator (ASUVG) were run to simulate dust flux in dust devils. These tests used particles 2 μm in diameter and 2600 kg m-3in density, and the results were compared with data from natural dust devils on Earth and Mars. Typically, the cores of dust devils (regardless of planetary environment) have a pressure drop of ∼0.2-1.5 percent of ambient atmospheric pressure. Core pressure drops in our experiments ranged from ∼0.01 to 5.00 percent of ambient pressure (10 mbar Mars cases and 1000 mbar for Earth cases). Flux experiments were run at vortex tangential wind velocities of 1 to 42 m s-1; typically ∼35-50 percent above threshold values for the particles used. Dust flux was determined by time averaged measurements of mass loss for a given vortex size. Dust fluxes of ∼10-3 kg m-2 s-1 were obtained, similar to estimates for flux for dust devils on Earth and Mars, regardless of core size. Vortex strength appears to be closely related to the strength of the pressure drop in the core (AP) and is less determined by size of the vortex. This is critical in scaling the laboratory results to natural dust devils.

Revue / Journal Title

Geophysical research letters    ISSN  0094-8276   CODEN GPRLAJ 

Source / Source

Congrès
Dust Devils on Earth and Mars. Workshop (08/2005)
2006, vol. 33, no19, [Note(s): L19S09.1-L19S09.5] (20 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

North America

;

United States

;

Arizona

;

strength

;

Mass loss

;

Wind velocity

;

experimental studies

;

atmospheric pressure

;

drill cores

;

Mars

;

Earth

;

density

;

Diameter

;

particles

;

simulation

;

Dust devil

;

dust

;

Mots-clés français / French Keywords

Amérique du Nord

;

Etats Unis

;

Arizona

;

Résistance mécanique

;

Perte masse

;

Vitesse vent

;

Etude expérimentale

;

Pression atmosphérique

;

Carotte

;

Planète Mars

;

Planète Terre

;

Densité

;

Diamètre

;

Particule

;

Simulation

;

Tourbillon poussière

;

Poussière

;

Mots-clés espagnols / Spanish Keywords

America del norte

;

Estados Unidos

;

Arizona

;

Resistencia mecánica

;

Pérdida masa

;

Velocidad viento

;

Presión atmosférica

;

Testigo

;

Planeta Marte

;

Planeta tierra

;

Densidad

;

Diámetro

;

Simulación

;

Remolino polvo

;

Polvo

;

Localisation / Location

INIST-CNRS, Cote INIST : 16687, 35400014313135.0810

Nº notice refdoc (ud4) : 18294447



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