365 research outputs found
Exploring the flow of two immiscible fluids in a square vertical mini-channel by direct numerical simulation
Numerical study of bubble train flow in a square vertical mini-channel: influence of length of the flow unit cell
Numerical study of bubble train flow in a square vertical mini-channel: influence of length of the flow unit cell
Network analysis of 3D complex plasma clusters in a rotating electric field
Network analysis was used to study the structure and time evolution of driven
three-dimensional complex plasma clusters. The clusters were created by
suspending micron-size particles in a glass box placed on top of the rf
electrode in a capacitively coupled discharge. The particles were highly
charged and manipulated by an external electric field that had a constant
magnitude and uniformly rotated in the horizontal plane. Depending on the
frequency of the applied electric field, the clusters rotated in the direction
of the electric field or remained stationary. The positions of all particles
were measured using stereoscopic digital in-line holography. The network
analysis revealed the interplay between two competing symmetries in the
cluster. The rotating cluster was shown to be more cylindrical than the
nonrotating cluster. The emergence of vertical strings of particles was also
confirmed.Comment: 9 pages, 9 figures; corrected Fig.4 and typo
Volume-of-fluid method based numerical simulations of gas-liquid two-phase flow in confined geometries
Volume-of-fluid method based numerical simulations of gas-liquid two-phase flow in confined geometries
Sources of dehydration fluids underneath the Kamchatka arc
© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Shu, Y., Nielsen, S. G., Le Roux, V., Wörner, G., Blusztajn, J., & Auro, M. Sources of dehydration fluids underneath the Kamchatka arc. Nature Communications, 13(1), (2022): 4467, https://doi.org/10.1038/s41467-022-32211-5.Fluids mediate the transport of subducted slab material and play a crucial role in the generation of arc magmas. However, the source of subduction-derived fluids remains debated. The Kamchatka arc is an ideal subduction zone to identify the source of fluids because the arc magmas are comparably mafic, their source appears to be essentially free of subducted sediment-derived components, and subducted Hawaii-Emperor Seamount Chain (HESC) is thought to contribute a substantial fluid flux to the Kamchatka magmas. Here we show that Tl isotope ratios are unique tracers of HESC contribution to Kamchatka arc magma sources. In conjunction with trace element ratios and literature data, we trace the progressive dehydration and melting of subducted HESC across the Kamchatka arc. In succession, serpentine (250 km depth) break down and produce fluids that contribute to arc magmatism at the Eastern Volcanic Front (EVF), Central Kamchatka Depression (CKD), and Sredinny Ridge (SR), respectively. However, given the Tl-poor nature of serpentine and lawsonite fluids, simultaneous melting of subducted HESC is required to explain the HESC-like Tl isotope signatures observed in EVF and CKD lavas. In the absence of eclogitic crust melting processes in this region of the Kamchatka arc, we propose that progressive dehydration and melting of a HESC-dominated mélange offers the most compelling interpretation of the combined isotope and trace element data.This study was financially supported by grants from the National Natural Science Foundation of China (NSFC) (Grant No. 41903008) and Chinese Postdoctoral Science Foundation (Grant No. 2019M660153) to Y.S., NSF (Grant No. EAR-1829546) to S.G.N. and NSF (Grant No. EAR-1855302) to V.L.R
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