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article

Characterization of flow, mixing and particle suspension in alumina draft tube precipitators of taller aspect ratio

T. Kumaresan, Shirish Thakre, T. Kumaresan, S. Thakre

Hydrometallurgy > 2014 > 150 > Complete > 107-122

Alumina precipitation is a vital rate determining step in the entire Bayer process. Industry scale draft tube precipitator design (Agglomerators and Growth tanks) in Bayer alumina process has the task to uniformly suspend the alumina hydrate particles with minimum power consumption. Lane (2006) reported that during the operation, there always was a difference in particle concentrations in the overflow...

article

Magma mixing and high fountaining during the 1959 Kīlauea Iki eruption, Hawai‘i

I. Sides, M. Edmonds, J. Maclennan, B.F. Houghton, more

Earth and Planetary Science Letters > 2014 > 400 > Complete > 102-112

The 1959 Kilauea Iki eruption provides a unique opportunity to investigate the process of shallow magma mixing, its impact on the magmatic volatile budget and its role in triggering and driving episodes of Hawaiian fountaining. Melt inclusions hosted by olivine record a continuous decrease in H ₂ O concentration through the 17 episodes of the eruption, while CO ₂ concentrations correlate...

article

Hydrothermal evolution in the Maher-Abad porphyry Cu–Au deposit, SW Birjand, Eastern Iran: Evidence from fluid inclusions

Kamal Siahcheshm, Ali Asghar Calagari, Ali Abedini, K. Siahcheshm, more

Ore Geology Reviews > 2014 > 58 > Complete > 1-13

Copper and gold mineralization in the Maher-Abad deposit, eastern Iran, is closely related to the multiple emplacement episodes of Upper Eocene granodiorite porphyries within andesitic volcaniclastic and coeval quartz monzonite stocks. The magmatic hydrothermal fluids thereafter hydrofracturing provided appropriate conduits, formed a stockwork of quartz and quartz-sulfide veinlets within the porphyritic...

article

Large-eddy simulation of supercritical fluid injection

X. Petit, G. Ribert, G. Lartigue, P. Domingo, more

The Journal of Supercritical Fluids > 2013 > 84 > Complete > 61-73

Mixing is a key point for thrust and efficiency of combustion systems. It becomes crucial in the case Liquid Rocket Engines as large investments are involved. Besides, the pressure in liquid rocket combustion chamber often exceeding the critical point of loaded propellants, mixing becomes an important scientific issue as fluid properties differ from classical ideal gas assumption. In this study, two...

article

High solids concentration agitation for minerals process intensification

J. Wu, S. Wang, L. Graham, R. Parthasarathy, more

AIChE Journal > 57 > 9 > 2316 - 2324

By using mixing intensification involving high solids concentration as a means to achieve process intensification for the mineral process industry is discussed here. Improving agitator energy efficiency is essential for operating at high solids concentrations. It is shown that improved agitator energy efficiency can be achieved by removing baffles and using higher power number impellers at high solids...

article

Warming mediates the resistance of aquatic bacteria to invasion during community coalescence

Máté Vass, Anna J. Székely, Eva S. Lindström, Omneya A. Osman, more

Molecular Ecology > 30 > 5 > 1345 - 1356

The immigration history of communities can profoundly affect community composition. For instance, early‐arriving species can have a lasting effect on community structure by reducing the invasion success of late‐arriving ones through priority effects. This can be particularly important when early‐arriving communities coalesce with another community during dispersal (mixing) events. However, the outcome...

article

Numerical study of mixing of cavitating flows in a Venturi tube

Hongbo Shi, Qingxia Liu, Petr Nikrityuk

The Canadian Journal of Chemical Engineering > 99 > 3 > 813 - 828

This work is devoted to a computational investigation of the cavitation and mixing characteristics of two miscible (Schmidt number Sc = 10³) turbulent water flows with different viscosity ratios in a Venturi tube. The 2D axis‐symmetric RANS and 3D LES turbulence models are used for the prediction of flow characteristics. The numerical results reveal that the RANS solutions underpredict the rate of...

article

Modelling study of emulsion latex coagulation processes in coagulators

Dang Cheng, Nida Sheibat‐Othman, Timothy F. L. McKenna

The Canadian Journal of Chemical Engineering > 99 > 1 > 383 - 400

This paper presents a numerical study of emulsion latex coagulation processes in continuous coagulators based on the full computational fluid dynamics approach. The RANS approach together with the k‐ε turbulence model was used to describe the detailed flow field in the coagulators. The coagulant mixing process was modelled by the convection‐diffusion equation and the emulsion latex coagulation process...

article

Mechanisms and conditions that affect phase inversion processes: A review

Juan M. Maffi, Gregorio R. Meira, Diana A. Estenoz

The Canadian Journal of Chemical Engineering > 99 > 1 > 178 - 208

The phenomenon of phase inversion occurs in liquid‐liquid dispersions found in a variety of chemical engineering fields. From simple oil‐water mixtures to complex polymeric systems, the operating variables that affect this physical phenomenon are discussed in this work. The contribution on this matter by a large number of researchers is critically assessed, outlining both coherent and conflicting...

article

Analysis of multi‐input multi‐output transactions in the Bitcoin network

Silivanxay Phetsouvanh, Anwitaman Datta, Frédérique Oggier

Concurrency and Computation: Practice and Experience > 33 > 1 > n/a - n/a

Distinct transactions among different and unrelated users are combined together to create a single Bitcoin transaction (mixing transaction) to obfuscate the relationships among the actual participants (more specifically, the wallet addresses used for the transactions). We consider multi‐input multi‐output transactions with at least two inputs and three outputs as proxy, to analyze four characteristic...

article

Computational fluid dynamics analysis of mixing and gas–liquid mass transfer in wave bag bioreactor

Kirilynn Svay, Christine Urrea, Parviz Ayazi Shamlou, Hu Zhang

Biotechnology Progress > 36 > 6 > n/a - n/a

Single use bioreactors provide an attractive alternative to traditional deep‐tank stainless steel bioreactors in process development and more recently manufacturing process. Wave bag bioreactors, in particular, have shown potential applications for cultivation of shear sensitive human and animal cells. However, the lack of knowledge about the complex fluid flow environment prevailing in wave bag bioreactors...

article

Numerical Investigations of Perfectly Mixed Condition at the Inlet of Free Radical Polymerization Tubular Microreactors of Different Geometries

Dhiraj K. Garg, Christophe A. Serra, Yannick Hoarau, Dambarudhar Parida, more

Macromolecular Theory and Simulations > 29 > 6 > n/a - n/a

The numerical investigation of free radical polymerization (FRP) of methyl methacrylate under mixed feed condition at inlet is made for three microtubular reactor geometries, namely, straight tube, coiled tube, and coil flow inverter reactor. The effect of variation of fluid thermophysical properties (FTPP) (density, viscosity, and thermal conductivity) with reaction along with discrete variation...

article

A ‘match–no match‘ numerical and graphical kernel density approach to interpreting lead isotope signatures of ancient artefacts

Sarah De Ceuster, Patrick Degryse

Archaeometry > 62 > S1 > 107 - 116

A new method for interpreting lead isotope ratios of artefacts is presented: a numerical and graphical ‘match–no match‘ with possible raw materials. By calculating the definite integral under the kernel density estimate plot of different mining districts, using open‐access software and legacy data, the relative probability that an object is made of an ore is indicated. A match with the reference data...

article

Eigenspectra for flocculation quality estimation

Christian N. Veenstra, Neville Dubash, Scott E. Webster, Wayne A. Brown, more

AIChE Journal > 66 > 9 > n/a - n/a

We present an image analysis algorithm for flocculation quality estimation in high‐solids slurries, and demonstrate its performance using inline process images of oil sands tailings flocculation. While a skilled human operator can often successfully evaluate such images, variations in feed as well as the lack of isolated flocs or spatial reference‐points inherent in a high‐solids slurry can cause...

article

Numeric Simulation‐Based Analysis of the Mixing Process in Anaerobic Digesters of Biogas Plants

Fosca Conti, Abdessamad Saidi, Markus Goldbrunner

Chemical Engineering & Technology > 43 > 8 > 1522 - 1529

Stirring systems with two rotational three‐bladed propellers were analyzed using computational fluid dynamics. The propellers are located at three heights and seven angles in a tank with 9 m radius. The fluid was characterized by non‐Newtonian rheology and simulated by applying the k‐ε turbulence model and the standard k‐ω model. Reynolds numbers were estimated. High fluid speeds were obtained with...

article

Numerical Investigations of Different Tubular Microreactor Geometries for the Synthesis of Polymers under Unmixed Feed Condition

Dhiraj K. Garg, Christophe A. Serra, Yannick Hoarau, Dambarudhar Parida, more

Macromolecular Theory and Simulations > 29 > 4 > n/a - n/a

Two tubular microreactor geometries—straight tube reactor (STR) and coil flow inverter reactor (CFIR)—are numerically studied with unmixed feed condition for the synthesis of poly(methyl methacrylate) and poly(styrene) by free radical polymerization. A new transformation rendering model dimensionless in terms of concentration is used during computational fluid dynamics modeling. For decoupled case...

article

PVDF/ZnO composite films for photocatalysis: A comparative study of solution mixing and melt blending methods

Crissiê Dossin Zanrosso, Diego Piazza, Marla Azário Lansarin

Polymer Engineering & Science > 60 > 6 > 1146 - 1157

Heterogeneous photocatalysis represents a solution for several environmental problems. However, achieving photocatalyst separation from reaction media on a large scale remains a challenge, one that might be overcome by the immobilization of photocatalysts into supports. To this end, composites of polyvinylidene fluoride and zinc oxide (ZnO) were prepared by three different techniques: solution mixing...

article

Storm impacts on phytoplankton community dynamics in lakes

Jason D. Stockwell, Jonathan P. Doubek, Rita Adrian, Orlane Anneville, more

Global Change Biology > 26 > 5 > 2756 - 2784

In many regions across the globe, extreme weather events such as storms have increased in frequency, intensity, and duration due to climate change. Ecological theory predicts that such extreme events should have large impacts on ecosystem structure and function. High winds and precipitation associated with storms can affect lakes via short‐term runoff events from watersheds and physical mixing of...

article

Running the trophic gauntlet: Empirical support for reduced foraging success in juvenile salmon in tidally mixed coastal waters

Samantha E. James, Evgeny A. Pakhomov, Natalie Mahara, Brian P. V. Hunt

Fisheries Oceanography > 29 > 3 > 290 - 295

The productivity of Fraser River sockeye salmon has declined in recent years, with 2019 being the lowest return on record. The cause of the decline is still not fully understood; however, bottom‐up drivers and trophic interactions during the early marine migration are considered to be important contributing factors. McKinnell et al. (Fisheries Oceanography, 23, 2014 and 322) developed a “trophic gauntlet...

article

A study of the axial and radial competition segregation in a rotating drum with internal diameter changing

An‐Ni Huang, Tung‐Hsin Cheng, Hsiu‐Po Kuo

AIChE Journal > 66 > 5 > n/a - n/a

A binary mixture is mixed in a rotating drum composed by 19 rings with different inner diameters. It is found that the larger particles are concentrated in the rings with smaller inner diameters. The collection of the larger particles in these rings is due to the particle dynamic angle of repose. The transition from the particle segregation core pattern at the end wall to the good radial mixing rings...

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Search results

Characterization of flow, mixing and particle suspension in alumina draft tube precipitators of taller aspect ratio

Magma mixing and high fountaining during the 1959 Kīlauea Iki eruption, Hawai‘i

Hydrothermal evolution in the Maher-Abad porphyry Cu–Au deposit, SW Birjand, Eastern Iran: Evidence from fluid inclusions

Large-eddy simulation of supercritical fluid injection

High solids concentration agitation for minerals process intensification

Warming mediates the resistance of aquatic bacteria to invasion during community coalescence

Numerical study of mixing of cavitating flows in a Venturi tube

Modelling study of emulsion latex coagulation processes in coagulators

Mechanisms and conditions that affect phase inversion processes: A review

Analysis of multi‐input multi‐output transactions in the Bitcoin network

Computational fluid dynamics analysis of mixing and gas–liquid mass transfer in wave bag bioreactor

Numerical Investigations of Perfectly Mixed Condition at the Inlet of Free Radical Polymerization Tubular Microreactors of Different Geometries

A ‘match–no match‘ numerical and graphical kernel density approach to interpreting lead isotope signatures of ancient artefacts

Eigenspectra for flocculation quality estimation

Numeric Simulation‐Based Analysis of the Mixing Process in Anaerobic Digesters of Biogas Plants

Numerical Investigations of Different Tubular Microreactor Geometries for the Synthesis of Polymers under Unmixed Feed Condition

PVDF/ZnO composite films for photocatalysis: A comparative study of solution mixing and melt blending methods

Storm impacts on phytoplankton community dynamics in lakes

Running the trophic gauntlet: Empirical support for reduced foraging success in juvenile salmon in tidally mixed coastal waters

A study of the axial and radial competition segregation in a rotating drum with internal diameter changing

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