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Items from 1 to 20 out of 5,495 results

article

Hydrodynamics over the Gulf of Valencia continental slope and their role in sediment transport

M. Ribó, P. Puig, H. van Haren, M. Ribo, more

Deep-Sea Research Part I > 2015 > 95 > Complete > 54-66

Circulation patterns and sediment dynamics were studied over the Gulf of Valencia (GoV) continental slope during spring and winter 2011–2012. Two moorings were deployed at two locations; at 450m depth from February to May 2011, and at 572m depth from October 2011 to February 2012. At both mooring sites, observations were made of currents, temperature and near-bottom turbidity within the lowermost...

article

Diversity, distribution and ecology of benthic molluscan communities on the Portuguese continental shelf

R. Martins, L. Sampaio, V. Quintino, A.M. Rodrigues, more

Journal of Sea Research > 2014 > 93 > Complete > 75-89

The diversity, ecology and distribution patterns of the Portuguese continental shelf malacofauna and its relationship with abiotic factors were studied from samples covering the western and the southern coast. A total of 2544 specimens were identified corresponding to 169 taxa, mostly bivalves (62% of the total taxa). Abra alba was the most abundant and the most frequent species. The alpha diversity...

article

Challenge problem: 1. Model validation of circulating fluidized beds

Rupen Panday, Lawrence J. Shadle, Mehrdad Shahnam, Ray Cocco, more

Powder Technology > 2014 > 258 > Complete > 370-391

The National Energy Technology Laboratory (NETL) worked with Particulate Solids Research Inc. (PSRI) to conduct the third CFD Challenge Problem in granular fluid flow to evaluate the progress and state of the art in simulating gas solids flow in a circulating fluidized bed. Both Group A and B particles were tested at several gas velocities and solids circulation rates. For both particle groups pressures...

article

Soft-bottom Portuguese continental shelf polychaetes: Diversity and distribution

R. Martins, L. Sampaio, A.M. Rodrigues, V. Quintino, more

Journal of Marine Systems > 2013 > 123-124 > Complete > 41-54

This study fulfills a gap in the knowledge of the annelid polychaete fauna from most of the Western Iberian coast, a particular biogeographic area where boreal, cold temperate, warm temperate and subtropical faunas can co-occur. A total of 145 samples covering the entire Portuguese continental shelf were analyzed to study the diversity and spatial distribution of the polychaetes and to discuss the...

article

Experimental verification of the model of piston ring pack operation of an internal combustion engine

Wolff, Andrzej, Wolff, Andrzej

Archive of Mechanical Engineering > 2009 > 56 > 1

article

Numerical simulation of piston ring pack operation with regard to ring twist effects

Wolff, Andrzej, Piechna, Janusz, Wolff, Andrzej, Piechna, Janusz

Archive of Mechanical Engineering > 2007 > 54 > 1

article

Impact of hydraulic forces on the passage of round goby (Neogobius melanostomus), gudgeon (Gobio gobio) and bullhead (Cottus gobio) in a vertical slot fish pass

Joschka Wiegleb, Philipp E. Hirsch, Frank Seidel, Georg Rauter, more

Ecology of Freshwater Fish > 32 > 2 > 416 - 430

Every fish migrating upstream through vertical slot fish passes must swim through slots, where the resistance force of flowing water could affect the passage success. We measured the hydraulic force acting on the body of preserved benthic fish in a vertical slot at different water discharge rates (80 and 130 L/s) to compare the hydraulic burden individual fish species (round goby Neogobius melanostomus...

article

Tribology of dust‐stop seals of mixing machines

Ehsan Fatourehchi, Hamed Shahmohamadi, Ramin Rahmani, Homer Rahnejat, more

Lubrication Science > 35 > 3 > 193 - 206

Dust stop seals are widely used in powder and rubber mixing industries. Design of the sealing system requires a continuous supply of pressurised lubricant, which is not recycled because of the risk of contamination. There is also the potential of large volume leakage of oil due to poor sealing, increasing operational costs and necessitating remedial measures to avoid environmental protection. Furthermore,...

article

Hydrodynamics and mass transfer enhancement of gas–liquid flow in micropacked bed reactors: Effect of contact angle

Hongbin Wang, Tao Zhou, Shaopeng Han, Lian Duan, more

AIChE Journal > 69 > 2 > n/a - n/a

Pressure drop, residence time distribution, dispersive behavior, liquid holdup, and mass transfer performance of gas–liquid flow in micropacked bed reactors (μPBRs) with different contact angles (CA) of particles are studied. The value of pressure drop for three types of beads can be obtained: copper beads (CA = 88.1°) > stainless steel beads (CA = 70.2°) > glass beads (CA = 47.1°). The liquid...

article

Seed‐ versus transplant‐based eelgrass (Zostera marina L.) restoration success in a temperate marine lake

Rens J. T. Cronau, Jimmy Fouw, Marieke M. Katwijk, Tjeerd J. Bouma, more

Restoration Ecology > 31 > 1 > n/a - n/a

Despite active seagrass restoration gaining traction as a tool to halt and reverse worldwide seagrass losses, overall success remains limited. Restoration strategies, through seeding or transplantation, face different environmental bottlenecks that limit success. Choosing the most appropriate strategy of the two for a specific location, however, is hampered by lack of direct practical comparisons...

article

Spreading of point‐source liquid spills in a thin rectangular packed bed under simulated marine conditions

Wei Liu, Faïçal Larachi, Guang‐Wen Chu, Yong Luo, more

AIChE Journal > 69 > 1 > n/a - n/a

Two‐dimensional visualizations of point‐source liquid spills in porous media were performed in a flat rectangular packed bed, emplaced on a robotized hexapod, to emulate roll/pitch marine oscillations. The extent to which the directional modulation of liquid gravity and the moving‐bed inertial forces affect the liquid spills was the study's central aim. Spill morphology deviations were dictated by...

article

Hydrodynamics and film formation characteristics in a horizontal self‐cleaning twin‐shaft kneader for polymer devolatilization

Shu An, Zuwei Liao, Xiaodong Hong, Zhengliang Huang, more

Journal of Applied Polymer Science > 140 > 4 > n/a - n/a

A deep understanding of hydrodynamics and film formation characteristics is a prerequisite for the design of twin‐shaft kneaders. In this work, the hydrodynamics and film formation characteristics of a self‐cleaning twin‐shaft kneader are investigated using computational fluid dynamics method. Because of the intermeshing interaction and scratching action of the kneader rods, both bounded films and...

article

Simulating sedimentation on the Great Bahama Bank – Sources, sinks and storms

Cecilia Lopez‐Gamundi, Thomas Dobbelaere, Emmanuel Hanert, Paul M. Harris, more

Sedimentology > 69 > 7 > 2693 - 2714

This study developed a high‐fidelity hydrodynamic simulation of sediment production, transport and deposition for the Great Bahama Bank. This model was run with a time‐step of 15 min for the entirety of 2016, forced by tides, off‐platform circulation and wind. Encompassed in this run are 364 days of fair‐weather conditions and two days when the passage of Category 4 Matthew brought hurricane‐force...

article

Impact of microcarrier concentration on mesenchymal stem cell growth and death: Experiments and modeling

Charlotte Maillot, Natalia De Isla, Celine Loubiere, Dominique Toye, more

Biotechnology and Bioengineering > 119 > 12 > 3537 - 3548

Mesenchymal stem cell (MSC) products are promising therapeutic candidates to treat a wide range of pathologies. The successful commercialization of these cell therapies will, however, depend on the development of reproducible cell production processes. For this, using microcarriers as growth supports within controlled conditions may be a viable process option. Although increasing microcarrier concentration...

article

Determination of sediment transport capacity by hydrodynamic variables considering subsurface water flow

Tingting Tao, Yanhai Li, Shiqi Chen, Xiaoyan Chen

Land Degradation & Development > 33 > 17 > 3461 - 3471

Subsurface water flow can cause serious soil erosion on sloping farmland. Sediment transport capacity (T_c) data at different subsurface water flow depths are limited. The objective of this study was to develop a new equation that can accurately determine T_c under subsurface water flow impacts. Subsurface water flows were arranged at three depths: 15, 10, and 5 cm. Three flow discharges (2, 4, and...

article

Less Than the Sum of Its Parts: Blade Clustering Reduces Drag in the Bull Kelp, Nereocystis luetkeana (Phaeophyceae)

Alana Breitkreutz, Liam J. M. Coleman, Patrick T. Martone, M. Edwards

Journal of Phycology > 58 > 4 > 603 - 611

Nereocystis luetkeana is a large, canopy‐forming kelp that is commonly found in nearshore waters between Alaska and California. Despite regularly reaching lengths in excess of 30 m, this alga demonstrates a remarkable ability to endure hydrodynamically stressful environments without being dislodged by waves or currents. While morphological aspects of this kelp, including its long flexible stipe, have...

article

Analytical solutions describing the oblique flow of a viscous incompressible fluid around a dendritic crystal

Dmitri V. Alexandrov, Peter K. Galenko

Mathematical Methods in the Applied Sciences > 45 > 13 > 8060 - 8068

This article considers the hydrodynamic problem of an oblique flow of a viscous incompressible fluid around the tip of a dendritic crystal. Approximate analytical solutions of Oseen's hydrodynamic equations are obtained in 2D and 3D cases using special curvilinear coordinates. It is shown that the projections of the fluid velocity change significantly with a change in the flow slope and Reynolds number...

article

A study of the hydraulic parameters and ecological significance of braided rivers under flow variations

Hao Wang, Hong Li, Lihua You, Zaixiang Zhu, more

River Research and Applications > 38 > 6 > 1080 - 1089

One‐dimensional numerical simulations based on the actual braided‐channel geometry in the middle reaches of the Yarlung Tsangpo River can be used to calculate the characteristics of braided channels in terms of their branching conditions and hydraulic parameters. Numerical modeling in the study area showed that a higher number of branches at fish‐spawning grounds may provide more suitable habitats...

article

Hydrodynamically Controlled Self‐Organization in Mixtures of Active and Passive Colloids

Ian P. Madden, Linlin Wang, Juliane Simmchen, Erik Luijten

Small > 18 > 21 > n/a - n/a

Active particles are known to exhibit collective behavior and induce structure in a variety of soft‐matter systems. However, many naturally occurring complex fluids are mixtures of active and passive components. The authors examine how activity induces organization in such multi‐component systems. Mixtures of passive colloids and colloidal micromotors are investigated and it is observed that even...

article

Hydrodynamically Controlled Self‐Organization in Mixtures of Active and Passive Colloids (Small 21/2022)

Ian P. Madden, Linlin Wang, Juliane Simmchen, Erik Luijten

Small > 18 > 21 > n/a - n/a

Self‐Organization of Multi‐Component Systems Recent efforts in materials science have focused on biologically inspired mixtures of active and passive colloids. In article number 2107023, Juliane Simmchen, Erik Luijten, and co‐workers examine the effects of a minority of active particles on the collective behavior of a majority of passive particles. Integrated simulations and experiments elucidate...

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Search results

Hydrodynamics over the Gulf of Valencia continental slope and their role in sediment transport

Diversity, distribution and ecology of benthic molluscan communities on the Portuguese continental shelf

Challenge problem: 1. Model validation of circulating fluidized beds

Soft-bottom Portuguese continental shelf polychaetes: Diversity and distribution

Experimental verification of the model of piston ring pack operation of an internal combustion engine

Numerical simulation of piston ring pack operation with regard to ring twist effects

Impact of hydraulic forces on the passage of round goby (Neogobius melanostomus), gudgeon (Gobio gobio) and bullhead (Cottus gobio) in a vertical slot fish pass

Tribology of dust‐stop seals of mixing machines

Hydrodynamics and mass transfer enhancement of gas–liquid flow in micropacked bed reactors: Effect of contact angle

Seed‐ versus transplant‐based eelgrass (Zostera marina L.) restoration success in a temperate marine lake

Spreading of point‐source liquid spills in a thin rectangular packed bed under simulated marine conditions

Hydrodynamics and film formation characteristics in a horizontal self‐cleaning twin‐shaft kneader for polymer devolatilization

Simulating sedimentation on the Great Bahama Bank – Sources, sinks and storms

Impact of microcarrier concentration on mesenchymal stem cell growth and death: Experiments and modeling

Determination of sediment transport capacity by hydrodynamic variables considering subsurface water flow

Less Than the Sum of Its Parts: Blade Clustering Reduces Drag in the Bull Kelp, Nereocystis luetkeana (Phaeophyceae)

Analytical solutions describing the oblique flow of a viscous incompressible fluid around a dendritic crystal

A study of the hydraulic parameters and ecological significance of braided rivers under flow variations

Hydrodynamically Controlled Self‐Organization in Mixtures of Active and Passive Colloids

Hydrodynamically Controlled Self‐Organization in Mixtures of Active and Passive Colloids (Small 21/2022)

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