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Experimental and numerical study of a cylinder passing through fluidized natural mud Waterbouwkundig Laboratorium
Bayer’s process bauxite residue (“red mud”) as catalyst for the production of low cost carbon nanotubes KU Leuven
The use of red mud as a catalyst for the catalytic chemical vapor deposition (CCVD) synthesis of carbon nanotubes (CNTs) is investigated in this paper. The experiments were carried out in a vertical hot-wall CVD reactor employing ethylene as carbon source, and using different temperatures and ferroalumina (red mud) qualities. Growth rates were continuously monitored using an electronic microbalance coupled to the reactor. The obtained products ...
Mud dynamics in the Port of Zeebrugge Vlaams Instituut voor de Zee Waterbouwkundig Laboratorium
This paper presents the mud dynamics in the harbor basin of Zeebrugge in the Southern North Sea based on an analysis of field data. Mud is typically transported into and within the harbor basin through advection of suspended particulate matter (SPM).
Three important timescales have been identified. On the intratidal timescale, sediment import occurs from 2 h before high water to high water. Flood currents in the North Sea (directed ...
Three important timescales have been identified. On the intratidal timescale, sediment import occurs from 2 h before high water to high water. Flood currents in the North Sea (directed ...
Experimental study of a cylinder towed through natural mud Universiteit Gent
With the rapid increase in ship size, the definition of the nautical bottom is becoming more crucial for ports and waterways authorities worldwide. Previous theoretical and experimental research has demonstrated that under certain conditions it is possible to sail through fluidized mud. However, in most numerical models, the complex rheological behaviour of the natural mud is simplified and treated as a Newtonian fluid. To better understand the ...
Mud disposal and suspended sediment concentration in the lower sea Scheldt Universiteit Antwerpen
In this paper, an analysis of continuous SSC measurements in the Sea Scheldt is presented. Information from different projects that focus on the state of the Scheldt Estuary (Belgium-Netherlands) and the management of dredging and disposal activities, is discussed to increase the insight in the effects of mud disposal and the increasing sediment concentrations (SSC) in the Lower Sea Scheldt. A positive feedback loop has been hypothesized and ...
Characteristics of hydrate-bound gas retrieved at the Kedr mud volcano (southern Lake Baikal) Universiteit Gent
We reported the characteristics of hydrate-bound hydrocarbons in lake-bottom sediments at the Kedr mud volcano in Lake Baikal. Twenty hydrate-bearing sediment cores were retrieved, and methane-stable isotopes of hydrate-bound gases (delta13C and delta2H of-47.8 to-44.0 V-PDB and-280.5 to-272.8 V-SMOW, respectively) indicated their thermogenic origin accompanied with secondary microbial methane. Powder X-ray diffraction patterns of the crystals ...
Prediction of the forces acting on container carriers in muddy navigation areas using a fluidization parameter Universiteit Gent
To assess the safety of navigation in muddy areas, a comprehensive captive manoeuvring model test program was executed. Based on the results of this experimental program, a four-quadrant manoeuvring model was built with a separate set of coefficients for each combination of under-keel clearance and mud layer characteristics. The disadvantage of this model is that only conditions corresponding with the experimental ones can be simulated. A more ...
Squat in muddy navigation areas Universiteit Gent
Based on experiments with captive and self-propelled ship models, a description of the phenomena that dominate the ship’s squat in muddy areas is given. It can be concluded that the average sinkage of a vessel navigating in muddy channels is generally reduced by the presence of mud layers, but the dynamic trim is affected significantly by the generation of interface undulations. For ships navigating above mud layers, the maximum sinkage is ...