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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

Experimental study and numerical modeling of mixing by air injection in yield stress fluids using the OpenFOAM software

Ali Hojeij, Laurent Jossic, Philippe Séchet, Cyrille Bonamy, more

AIChE Journal > 68 > 2 > n/a - n/a

Mixing by gas injection is an operation used in industrial processes such as wastewater treatment, metallurgy, or methanization in which pressurized gas is injected into a fluid in order to reduce concentrations and temperatures gradients. This study demonstrates how the CFD toolbox OpenFOAM can be used to simulate such flows. Experimental measurements and observations have been performed on a pilot‐scale...

article

The effect of radial impeller geometry on the link between power and flow numbers

Thomas P. John, Claudio P. Fonte, Adam Kowalski, Thomas L. Rodgers

AIChE Journal > 68 > 1 > n/a - n/a

Impellers in stirred vessels are often characterized by dimensionless numbers such as the power and flow numbers. These are often crucial in determining mixing performance. Previous studies for high‐shear mixers have yielded correlations between the power, flow, and mixer geometries, since in these mixers the flow can be independently varied. For stirred vessels, dimensional analysis is typically...

article

Some experimental studies concerning mixing of loose and liquid agricultural materials

Jan Barwicki, Kamil Roman, Kinga Borek, Kamila Mazur, more

Inżynieria Materiałowa > 2021 > Vol. 42, nr 4-5 > 18--20

In the study some experimental research concerning mixing process loose and liquid agricultural products were presented. The research is concerned the following aspects of the study: the theory of the mixing process, the trajectory of movement of the molecules involved in the mixing process, the forces affecting the structural elements of the mixers, the types of mass flow of mixed components, the...

article

Time‐dependent flows in grooved non‐isothermal channels

Shoyon Panday, Jerzy Maciej Floryan

International Journal for Numerical Methods in Fluids > 93 > 12 > 3313 - 3337

A highly accurate and fully implicit algorithm for analyses of transient effects in heated grooved channels, including chaotic responses and transition to secondary states, has been developed. The algorithm can handle pattern interaction problems arising from combinations of geometric and heating patterns which are expected to be beneficial in the development of energy efficient stirring systems....

article

Computational Fluid Dynamics Model of Two‐Phase Flow in NETmix Reactors

Isabel Sousa Fernandes, Margarida Sarmento e Cunha Abrunhosa Brito, Yaidelin Alves Manrique, Madalena Maria Dias, more

Chemical Engineering & Technology > 44 > 11 > 2002 - 2010

A computational fluid dynamics (CFD) modeling approach was developed to study the mixing of two immiscible liquids in NETmix reactors. A two‐dimensional two‐phase CFD model based on the Euler‐Euler approach with the volume‐of‐fluid (VOF) method was implemented in a reduced physical domain from the imposition of periodic boundary conditions. The fluids modeled were sunflower oil and water. The VOF...

article

Influences of pretreatment, extraction variables, and post treatment on bench‐scale rice husk black ash (RHBA) processing to bio‐silica

Soen Steven, Elvi Restiawaty, Pasymi Pasymi, Yazid Bindar

Asia‐Pacific Journal of Chemical Engineering > 16 > 5 > n/a - n/a

Abundant availability and large silica content in rice husk black ash (RHBA) make the use of it very interesting to study. Many works only deal with lab‐scale rice husk ash extraction while the studies on bench‐scale RHBA extraction are still limited. This study, hence, presents the influence of pretreatment, extraction variables, and posttreatment on bench‐scale RHBA processing to bio‐silica. The...

article

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

Jun Liu, Yiran Jiao, Yuan Pu, Jie‐Xin Wang, more

AIChE Journal > 67 > 11 > n/a - n/a

Luminescent thermometry is a noninvasive method of temperature detection with high sensitivity and response speed. The present study demonstrated the process‐intensified synthesis of ytterbium and erbium codoped calcium molybdate phosphors (CaMoO₄:Yb³⁺/Er³⁺). The experiment involved the initial premixing of the precursors using a high‐gravity rotating packed bed (RPB) reactor and subsequent calcination...

article

Spatial Extent of Fluorescence Quenching in Mixed Semiconductor–Metal Nanoparticle Gel Networks

Marina Rosebrock, Dániel Zámbó, Pascal Rusch, Denis Pluta, more

Advanced Functional Materials > 31 > 41 > n/a - n/a

In this work, mixing and co‐gelation of Au nanoparticles (NPs) and highly luminescent CdSe/CdS core/shell nanorods (NRs) are used as tools to obtain noble metal particle‐decorated macroscopic semiconductor gel networks. The hybrid nature of the macrostructures facilitates the control over the optical properties: while the holes are trapped in the CdSe cores, the connected CdSe/CdS NRs support the...

article

Spatial Extent of Fluorescence Quenching in Mixed Semiconductor–Metal Nanoparticle Gel Networks (Adv. Funct. Mater. 41/2021)

Marina Rosebrock, Dániel Zámbó, Pascal Rusch, Denis Pluta, more

Advanced Functional Materials > 31 > 41 > n/a - n/a

Semiconductor Gel Networks In article number 2101628, Nadja C. Bigall and co‐workers demonstrate that a single gold nanoparticle is able to quench the fluorescence of up to 9 semiconductor nanorods in mixed, co‐gelated gel networks. Upon varying the particle number ratio of CdSe/CdS and Au nanocrystals, the spatial extent of quenching, thus, the travel distance of photoexcited electrons is changed...

article

Potential misdiagnosis of von Willebrand disease caused by insufficient mixing after thawing frozen plasma

Su‐Yeon Jo, In‐Suk Kim, Hyerim Kim

International Journal of Laboratory Hematology > 43 > 4 > 831 - 836

Introduction von Willebrand disease (vWD) is a common inherited bleeding disorder caused by a deficiency in von Willebrand factor (vWF), but many laboratories and clinicians continue to struggle with diagnosing or excluding vWD. Its diagnosis requires laboratory testing, which may be compromised by preanalytical events, including poor specimen quality. This study assessed 17 different preanalytical...

article

Millisecond timescale reactions observed via X‐ray spectroscopy in a 3D microfabricated fused silica mixer

Diego A. Huyke, Ashwin Ramachandran, Oscar Ramirez-Neri, Jose A. Guerrero-Cruz, more

Journal of Synchrotron Radiation > 28 > 4 > 1100 - 1113

Determination of electronic structures during chemical reactions remains challenging in studies which involve reactions in the millisecond timescale, toxic chemicals, and/or anaerobic conditions. In this study, a three‐dimensionally (3D) microfabricated microfluidic mixer platform that is compatible with time‐resolved X‐ray absorption and emission spectroscopy (XAS and XES, respectively) is presented...

article

Mixing Performance of Baffles in Shear‐Thinning Fluids

Haruki Furukawa, Yoshito Mizuno, Yoshihito Kato

Chemical Engineering & Technology > 44 > 8 > 1440 - 1446

The mixing performance of baffles placed with a clearance between them and the mixing vessel wall was investigated in a shear‐thinning fluid, and decolorization experiments were conducted to observe the mixing pattern under no‐baffle, standard baffle, and inner‐baffle conditions. Velocity fields were obtained by particle image velocimetry to clarify the mixing mechanism in the fluid. No isolated mixing...

article

Bootstrap for integer‐valued GARCH(p, q) processes

Michael H. Neumann

Statistica Neerlandica > 75 > 3 > 343 - 363

We consider integer‐valued processes with a linear or nonlinear generalized autoregressive conditional heteroscedastic models structure, where the count variables given the past follow a Poisson distribution. We show that a contraction condition imposed on the intensity function yields a contraction property of the Markov kernel of the process. This allows almost effortless proofs of the existence...

article

Enhancement of microalgae growth using magnetic artificial cilia

Thijn Verburg, Allison Schaap, Shuaizhong Zhang, Jaap Toonder, more

Biotechnology and Bioengineering > 118 > 7 > 2472 - 2481

Microalgae have shown great potential as a source of biofuels, food, and other bioproducts. More recently, microfluidic devices have been employed in microalgae‐related studies. However, at small fluid volumes, the options for controlling flow conditions are more limited and mixing becomes largely reliant on diffusion. In this study, we fabricated magnetic artificial cilia (MAC) and implemented them...

article

Investigation of wet coal flow characteristics in silos by experiments and simulations

Li Dai, Zhulin Yuan, Lei Guan, Conghui Gu

Asia‐Pacific Journal of Chemical Engineering > 16 > 3 > n/a - n/a

The investigation of the wet coal flow characteristics is carried out in a three‐dimensional silo system by experiments and simulations. The effect of the moisture content on the flow characteristics is firstly investigated by experiments, which is in terms of bulk density, angle of repose, and flow rate at outlet. When moisture content is below 9%, the coal particles act as the easy flow mode. When...

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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

Experimental study and numerical modeling of mixing by air injection in yield stress fluids using the OpenFOAM software

The effect of radial impeller geometry on the link between power and flow numbers

Some experimental studies concerning mixing of loose and liquid agricultural materials

Time‐dependent flows in grooved non‐isothermal channels

Computational Fluid Dynamics Model of Two‐Phase Flow in NETmix Reactors

Influences of pretreatment, extraction variables, and post treatment on bench‐scale rice husk black ash (RHBA) processing to bio‐silica

Scalable synthesis of ytterbium and erbium codoped calcium molybdate phosphors as upconversion luminescent thermometer

Spatial Extent of Fluorescence Quenching in Mixed Semiconductor–Metal Nanoparticle Gel Networks

Spatial Extent of Fluorescence Quenching in Mixed Semiconductor–Metal Nanoparticle Gel Networks (Adv. Funct. Mater. 41/2021)

Potential misdiagnosis of von Willebrand disease caused by insufficient mixing after thawing frozen plasma

Millisecond timescale reactions observed via X‐ray spectroscopy in a 3D microfabricated fused silica mixer

Mixing Performance of Baffles in Shear‐Thinning Fluids

Bootstrap for integer‐valued GARCH(p, q) processes

Enhancement of microalgae growth using magnetic artificial cilia

Investigation of wet coal flow characteristics in silos by experiments and simulations

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