Oscillation of Droplets and Bubbles

Movassat, Mohammad

doi:10.1007/978-1-4419-7264-4_5

Cited by 11 publications

(9 citation statements)

References 44 publications

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“…This primary high‐energy event would produce a droplet of relatively low viscosity. Surface tension would have tended to mold the droplet into a spheroid, but in some cases, oscillations of the rotating droplet resulted in an ellipsoidal shape (e.g., Busse 1984; Ashgriz and Movassat 2011) that was frozen‐in during quenching. This could account for the high aspect ratios of the axes in some chondrules (up to 2.36:1; King and King 1978) in unshocked chondrites.…”

Section: Discussionmentioning

confidence: 99%

Evidence from phosphorus X‐ray mapping for a multistep process in the formation of olivine phenocrysts in FeO‐rich porphyritic chondrules

Rubin

Baecker

Ruzicka³

2021

Meteorit & Planetary Scien

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Phosphorus X‐ray maps of olivine phenocrysts in many type II (FeO‐rich) porphyritic chondrules in LL3.00 Semarkona and CO3.05 Y 81020 reveal multiple sets of thin dark/bright (P‐poor/P‐rich) layers that resemble oscillatory zoning. Such discrete layers are generally not evident in BSE images or in Fe, Cr, Ca, Al, Mg, or Mn X‐ray maps because rapid diffusion of these cations in olivine at high temperatures smoothed out their initial distributions, thereby mimicking normal igneous zoning. In contrast, the relatively slow diffusion of P in olivine preserves original dendritic or hopper morphologies of olivine crystals; these skeletal structures formed during quenching after initial chondrule melting. The skeletal olivine crystals were filled in with low‐P olivine during cooling after one or more subsequent heating events, mainly involving the melting of mesostasis. Crystallization of mafic silicates depleted the mesostasis in FeO and MgO and enriched it in silico‐feldspathic components. Sectioning of the olivine grains at particular orientations can produce apparent oscillatory zoning in P. Strong evidence of a secondary melting event is evident in Semarkona chondrule H5k. Phenocryst H5k‐2 in this chondrule has a relict core (with rhythmic P zoning layers) that was fractured and severed; it is overlain by a set of differently oriented subparallel P‐poor olivine layers. Chondrule C6f from Y 81020 contains a large multi‐lobed olivine phenocryst that still preserves hopper cavities, partially outlined by P‐poor/P‐rich olivine layers. The thin P‐rich rims surrounding many olivine phenocrysts could reflect a short period of rapid grain growth after a late‐stage chondrule reheating event.

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Section: Discussionmentioning

confidence: 99%

Evidence from phosphorus X‐ray mapping for a multistep process in the formation of olivine phenocrysts in FeO‐rich porphyritic chondrules

Rubin

Baecker

Ruzicka³

2021

Meteorit & Planetary Scien

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“…In section , we mentioned that increasing the simulation time in the PMF calculations from 2 to 10 ns does not change our results, which suggests that, for each distance between the meso-ions, the solvent is already well equilibrated within the simulation time frame. Indeed, the slowest vibration of a charged spherical liquid droplet is given by the expression ω 2 = 8 σ ρ R 0 3 ( 1 − X ) where σ is the surface tension, ρ is the density of the liquid, R 0 is the radius of the droplet, and X is the fissility defined in eq . For a chloroform droplet of R 0 = 3 nm and charge | q | = 10e (fissility X = 0.58) that we study in our simulations, eq gives ω ≈ 4.6 ps –1 and a characteristic time of the slowest vibration τ = 2π/ω ≈ 135 ps.…”

Section: Discussionmentioning

confidence: 99%

Interactions between Carbon Nanoparticles in a Droplet of Organic Solvent

2014

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We report the first detailed molecular dynamics study of two carbon nanoparticles (nanotubes or fullerenes) embedded in a droplet of chloroform. The carbon nanoparticles are negatively charged and are accompanied by the positive counterions of sodium. On the one hand, this setup is inspired by the carbon nanoparticle salts“nanotubides” and “fullerides”proposed recently as a convenient way to address the difficult problem of the dispersion of carbon nanoparticulates in the organic solvents. On the other hand, the electrospray of carbon nanoparticle suspensions has been shown to be a promising technique for the production of thin nanoparticle coatings. We explore the combination of these two approaches by using molecular simulations. We find that depending on the overall electrostatic charge balance the two nanoparticles can exist in the droplet either in the “salted-out” bound state or in a “solvent-separated” state. The latter opens up the possibility for the efficient dispersion of the nanoparticles in the charged droplet environment. We also find that depending on the charge of the nanoparticles the mother droplet may break evenly or unevenly with respect to the mass but evenly with respect to charge. The understanding of the fragmentation paths and the intermolecular interactions of the nanoparticles in droplets provides insight into the manner that the droplet chemistry can be manipulated so that effective dispersion of nanoparticulates can be achieved.

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“…As is well known, bubble oscillation consists of shape oscillation and volume oscillation . Though the oscillating frequency may be easily calculated, the energy distribution in the oscillating process is very complicated. , Inasmuch as the DBS model focuses on the structural paramters to describe the macroscale state, an alternative way was proposed to calculate N surf .…”

Section: Methodsmentioning

confidence: 99%

Mesoregime-Oriented Investigation of Flow Regime Transition in Bubble Columns

Han

Chen

2019

Ind. Eng. Chem. Res.

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This work investigates regime transition in bubble columns through a mesoscale framework. The dominant mechanisms in bubble columns are analyzed according to the concept of mesoregime. Model predictions with the modified stability condition agree well with experimental data. It indicates a scenario of the regime transition. That is, the homogeneous regime is liquid-dominated, which is characterized by the dominance of liquid over the movement of small bubbles, while the heterogeneous regime is gas-dominated, which is characterized by the dominance of large bubbles over the liquid movement. Consequently, the transition regime is a mesoregime depending on the principle of compromise in competition. The holdup profiles of the three regimes form an enclosed structure, which is corroborated by experiments in the literature. Moreover, the influence of superficial liquid velocities on the regime transition can be qualitatively captured by the model. Also, a GPU solver is developed to cope with the traversal optimizing procedure.

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Oscillation of Droplets and Bubbles

Cited by 11 publications

References 44 publications

Evidence from phosphorus X‐ray mapping for a multistep process in the formation of olivine phenocrysts in FeO‐rich porphyritic chondrules

Evidence from phosphorus X‐ray mapping for a multistep process in the formation of olivine phenocrysts in FeO‐rich porphyritic chondrules

Interactions between Carbon Nanoparticles in a Droplet of Organic Solvent

Mesoregime-Oriented Investigation of Flow Regime Transition in Bubble Columns

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