DOI: 10.1002/2014GL060059
论文题名: Effects of particle mixtures and nozzle geometry on entrainment into volcanic jets
作者: Jessop D.E. ; Jellinek A.M.
刊名: Geophysical Research Letters
ISSN: 0094-10617
EISSN: 1944-10348
出版年: 2014
卷: 41, 期: 11 起始页码: 3858
结束页码: 3863
语种: 英语
英文关键词: entrainment
; particle-laden flow
; source geometry
; volcanic jets
Scopus关键词: Air
; Air entrainment
; Geometry
; Mixtures
; Particles (particulate matter)
; Explosive eruption
; Nozzle geometries
; Particle laden flows
; Particle mixtures
; Pyroclastic mixtures
; Source geometry
; Turbulent entrainment
; Volcanic jets
; Volcanoes
; buoyancy
; entrainment
; flow modeling
; flow velocity
; inflow
; plume
; volcanic eruption
英文摘要: Efficient turbulent entrainment causes otherwise dense volcanic jets to rise high into the atmosphere as buoyant plumes. Classical models suggest that the inflow of air is 10-15% of the axial velocity, giving predictions for the height of the plume and, in turn, the composition and structure of the resulting umbrella clouds. Crucially, entrainment is assumed independent of source geometry and mechanically unaffected by the pyroclastic mixture properties. We show that particle inertia and vent geometry act to modify the shape of the largest eddies defining the jet's edge and thus entrainment of the ambient. Whereas particle-free flows are essentially unaffected by vent shape, entrainment into particle-laden flows is enhanced for flared vents and reduced for cylindrical vents. Our results predict that vent erosion during an explosive eruption reduces the height of volcanic jets, alters the structure and sedimentation regime of the umbrella cloud, and the resulting deposit. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902057775&doi=10.1002%2f2014GL060059&partnerID=40&md5=fc9c997ade9db80064167d006658701b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7881
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
Recommended Citation:
Jessop D.E.,Jellinek A.M.. Effects of particle mixtures and nozzle geometry on entrainment into volcanic jets[J]. Geophysical Research Letters,2014-01-01,41(11).