DOI: 10.1002/2014GL062292
论文题名: Experimental investigation of the aggregation-disaggregation of colliding volcanic ash particles in turbulent, low-humidity suspensions
作者: Del Bello E. ; Taddeucci J. ; Scarlato P. ; Giacalone E. ; Cesaroni C.
刊名: Geophysical Research Letters
ISSN: 0094-8935
EISSN: 1944-8666
出版年: 2015
卷: 42, 期: 4 起始页码: 1068
结束页码: 1075
语种: 英语
英文关键词: aggregation processes
; colliding particles
; disaggregation
; experimental modeling
; volcanic ash
; volcanic plumes
Scopus关键词: Aggregates
; Kinetic energy
; Kinetics
; Suspensions (fluids)
; Volcanoes
; Aggregation process
; Colliding particles
; Disaggregation
; Experimental modeling
; Volcanic ash
; Volcanic plume
; Agglomeration
; aggregation
; collision
; empirical analysis
; experimental study
; film
; humidity
; kinetic energy
; laboratory method
; plume
; turbulent mixing
; volcanic ash
英文摘要: We present the results of laboratory experiments on the aggregation and disaggregation of colliding volcanic ash particles. Ash particles of different composition and size <90μm were held in turbulent suspension and filmed in high speed while colliding, aggregating, and disaggregating, forming a growing layer of electrostatically bound particles along a vertical plate. At room conditions and regardless of composition, 60-80% of the colliding particles smaller than 32μm remained aggregated. In contrast, aggregation of particles larger than 63μm was negligible, and, when a layer formed, periods when disaggregation (mainly by collisions or drag) exceeded aggregation occurred twice as frequently than for smaller particles. An empirical relationship linking the aggregation index, i.e., the effective fraction of aggregated particles surviving disaggregation, to the mean particle collision kinetic energy is provided. Our results have potential implications on the dynamics of volcanic plumes and ash mobility in the environment. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84924907874&doi=10.1002%2f2014GL062292&partnerID=40&md5=efe36bedc25e2eac9eee64b0294d9c75
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8551
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Recommended Citation:
Del Bello E.,Taddeucci J.,Scarlato P.,et al. Experimental investigation of the aggregation-disaggregation of colliding volcanic ash particles in turbulent, low-humidity suspensions[J]. Geophysical Research Letters,2015-01-01,42(4).