AT
A.M. Talmon
Authored
6 records found
Rheological analysis and rheological modelling of mud sediments
What is the best protocol for maintenance of ports and waterways?
Natural mud sediments display complex rheological behaviour like thixotropy, viscoelasticity and yield stress. These rheological characteristics can significantly vary over depth, from one mud layer to another, as each layer can have a different density and composition. Fast and
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A 1-dimensional-two-layer transient drift-flux model for hydraulic transport pipelines
Modelling and experiments of bed layer erosion and density wave amplification
Hydraulic transport pipelines in the dredging, mining and deep sea mining are designed using steady-state methods. However, these methods cannot predict density wave formation. Density waves form a risk for pipeline blockages, therefore there is a need to understand and preferabl
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Concentration and pressure measurements of dense sand and gravel multiphase flows under transient flow conditions in a vertically oriented closed conduit
Assessment of system and sensor performance
The hydraulic transport of sediments in sediment–water multiphase mixtures is an important process in nature and many industrial applications. The flows are characterized by complex transient phenomena, in which the overall system scale and the particle scale are equally importan
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Shear settling in laminar open channel flow
Analytical solution, measurements and numerical simulation
In beaching of tailings, sand and clays may segregate. In laminar flow this is due to shear settling. First implementations of shear settling in numerical flow models are seen, offering unprecedented potential to conduct tailings management studies. In order to validate numerical
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Stability of vertical hydraulic transport processes for deep ocean mining
An experimental study
Vertical hydraulic transport systems for deep ocean mining have lengths up to a few kilometers from seafloor to sea surface. Typical ratios of particle diameter d over riser diameter D are d/D=O(10−1)d/D=O(10−1), and the feeding of the riser is irregular. These conditions make
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Contributed
14 records found
Transient Slurry Flow Phenomena after Bends in the Vertical Plane
An experimental study and analysis into the origin and development of density waves within pipeline systems using a sedimentation and erosion unbalance model
Density waves inhibit the stability of (long) pipelines, which cannot be predicted using current day design tools. Density waves are formed due to an inverse relationship between sand eroding and settling in a pipeline. By designing and building a dedicated flow loop, an experime
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Density wave amplification during long horizontal slurry transport
Experimental studies exploring mechanisms
This study is the first to experimentally show two wave mechanisms regarding density wave amplification with long horizontal slurry transport. There is bed-driven and suspended-driven density wave amplification, in which the grain size determines which mechanism is dominant.
Den
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Sand closures
A study towards the morphology under mixing layers using laboratory experiments and a numerical model
Dams are an essential part of the Dutch flood defence works to protect the hinterland from flooding by the sea. Sand closures are the construction of closure dams with sand as the main building material. The rising and falling tide generates a current through the closure gap, whi
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Offshore Pipeline Flotation during Sand Backfilling with a TSHD
An Experimental Study
Offshore pipelines represent major items in the oil and gas industry nowadays. These submarine pipelines are usually covered with backfill for protection and a well-known method for this is sand backfilling with a trailing suction hopper dredger (TSHD). Although pipeline installa
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Laboratory study on the efficiency of water injection dredging
An analysis on the influence of different dredge settings on the density current and production rate
The Port of Rotterdam experiences large amounts of siltation from the upstream rivers in its basins and canals every year. Furthermore, container vessels increase in size every decade and therefore require a larger navigational depth. These two factors cause the yearly amount of
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Particle Degradation during Vertical Transportation
Contribution of Abrasive Wear on Polymetallic Nodule Degradation
Manganese nodules have been lying on the deep sea soil for centuries before they became known. The first ones to discover the nodules were Murray and Renard, during their scientific cruise between 1872 and 1876 (Murray and Renard, 1876). The Clarion-Clipperton Zone, located betwe
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The deep sea mining horizontal discharge plume
Small-scale experiments and modelling
The rising demand for minerals and metals and the depletion of land-based resources has created a renewed interest in the extraction of resources from the deep ocean, i.g., deep sea mining. This research focuses on the mining of manganese nodules, these are potato-shaped objects,
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Rheological and plate’s hydrodynamic resistance in fluid mud measurements for the nautical bottom applications
An experimental study for sailing through fluid mud applications
When a ship reaches the shore, the water depth reduces and thus the under-keel clearance also reduces. The ship keel clearance influences the maneuverability of the sailing ship.
In this thesis project, the link between the fluid mud rheology and its density is first investigate
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NPSHr scaling in centrifugal pumps
Investigation of the influence of impeller speed and diameter on NPSHr properties of centrifugal pumps
One classic challenge in pump operation is the occurrence of cavitation. Cavitation is the forming of vapour bubbles in a fluid due to a local drop in pressure, followed by a subsequent implosion of those bubbles due to an increase in pressure. The vapour formed can significantl
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Horizontal negatively buoyant jets in deep sea mining
The influence of initial concentration of discharged slurries on the spatial spread of turbidity currents
Recently, deep-sea mining has acquired renewed interest from commercial companies due to a rise in the demand of minerals and metals. Deep-sea mining is focussed on different minerals and rare earth elements found in the oceans that are increasingly used in the manufacturing of g
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Inclined plunging jet
Study of an inclined plunging jet and its velocity profile at increasing water depths
Subsea rock installation is a process in offshore engineering where rocks are placed on the seabed or subsea structures using a fallpipe. An example of a subsea structure could be a cable or pipeline that must be protected. In this research, the main scope is rock installation fo
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Subsea rock installation is an offshore engineering process where rocks are placed on the seabed as protection of cables and pipelines and as scour protection. The inclined fallpipebis a new piece of equipment specifically designed to install rocks close to submerged structures.
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Over recent years, there has been an increase in demands for rare and precious minerals worldwide. Mostly this is due to the rise of the world’s population and the drive towards a green energy transition and low carbon economy. Prices are rapidly increasing, and there is an ident
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