Searched for: contributor%3A%22Westerweel%2C+J.+%28promotor%29%22
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Kislaya, A. (author)
The precise manipulation of particles and droplets is crucial to many microfluidic applications in engineering. The design of microfluidic devices is generally tailored to perform a specific task, with each specific application requiring a unique and fixed design. In this way, using a single device to perform multiple analyses of a wide range of...
doctoral thesis 2022
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Klapwijk, M.D. (author)
There is increasing attention for the effects of anthropogenic underwater radiated noise (URN) on marine fauna. This is expected to lead to regulations with respect to the maximum permitted sound emissions of ships. It is known that cavitating tip vortices, generated by ship propellers, are some of the key contributors to URN. Consequently,...
doctoral thesis 2021
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van Meerkerk, M. (author)
The prospect of stricter national and international emission standards for the shipping industry are a driving force in the search for alternative shipping fuels, such as liquefied natural gas (LNG). However, new challenges arise with the widespread use of LNG. For example, there is a desire to use LNG cargo containment...
doctoral thesis 2021
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Miessner, UP (author)
Digital microfluidics emerged and established over the last 20 years. The scope of applications ranges from pharmaceutical to biological, chemical and even thermal processes. The practical use of Taylor droplets as individual reaction chambers, mixing vessels or simply as transportation vehicles on process engineered microfluidic devices allows...
doctoral thesis 2021
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Greidanus, A.J. (author)
This thesis describes the investigation of the dynamics of turbulent shear flows over non-smooth surfaces. The research was conducted in two parts, related to the experimental facility used in combination with the applied functional surface. The first part describes the experiments of a turbulent Taylor-Couette flow over a...
doctoral thesis 2020
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Grift, E.J. (author)
The aim of this thesis is to analyse the hydrodynamics of rowing propulsion and to enhance this propulsion. This requires to have insight in both the flow phenomena and the generated hydrodynamic forces. In (competitive) rowing athletes generate a propulsive force by means of a rowing oar blade. During propulsion the oar blade is submerged close...
doctoral thesis 2020
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Schenke, S. (author)
Cavitation erosion is a problem in the design of a wide range of fluid machinery involving liquid flows. Ship propellers, rudders, hydro pumps and turbines or diesel injectors are some of the most prominent examples. Cavitation occurs at locations of high local flow velocity, where the pressure may drop so low that the liquid phase vaporizes....
doctoral thesis 2020
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Jahangir, S. (author)
Cavitation is a well-known phenomenon, occurring in a wide range of applications. In most applications, cavitation is undesirable, such as turbines, pumps, ship propellers and diesel injector nozzles. Cavitation can cause material erosion, flow blockage, noise and degradation of equipment over time. The ability to predict the behavior of this...
doctoral thesis 2020
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Gül, M. (author)
This thesis aims to contribute to the physical understanding of turbulence in canonical flows. For that purpose, experiments are conducted in a statistically steady turbulent pipe flow, ramp-type accelerating/decelerating turbulent pipe flow and turbulent Taylor-Couette flow. For the first two flows, time-resolved data is acquired in the cross...
doctoral thesis 2019
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van Eckeveld, A.C. (author)
Flow-induced acoustics are a well-known phenomenon, occurring in a broad variety of applications, as well as in nature. In many applications, the produced acoustics are purposeful, e.g. for communication and in musical instruments. In other circumstances, however, the sound and vibrations are a nuisance, and even harmful to human beings and the...
doctoral thesis 2019
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Benschop, H.O.G. (author)
A significant part of the fuel used for transportation results from the drag in turbulent flows. Techniques for turbulent drag reduction yield associated reductions of the fuel consumption and greenhouse gas emissions, which is desirable from both economic and environmental perspectives (cf. chapter 1). This thesis investigates two passive...
doctoral thesis 2018
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Quaranta, G. (author)
Synchronization of oscillators is an ubiquitous phenomenon that involves mechanical systems, like pendulum clocks, but also biological systems, like peacemaker cells in the heart or neural activity in the brain. If we consider biological systems at the microscale, namely at the scale of cells, we find that processes like locomotion and fluid...
doctoral thesis 2018
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Valori, V. (author)
Fluids above the critical point are widely used in industry. Chemical, pharmaceutical, food industry and energy production are some examples. In the energy production sector they are mainly used as cooling fluids, because they allow to increase the thermal efficiency of the power plants. However, the fundamentals of their heat transfer behavior...
doctoral thesis 2018
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Simões Costa, P. (author)
Transport of particles by a carrier fluid is an important, ubiquitous process. Few of many obvious examples are the blood flow that feeds oxygen to the different parts of our bodies, wind-assisted pollination, sediment transport in sand storms, avalanches, or rivers, cloud formation, and pyroclastic flows. In industry one can think of the...
doctoral thesis 2017
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Goudar Vishwanathappa, M. (author)
Turbulence is implicitly present or explicitly desired in many natural and industrial processes, such as, flow over solid surfaces, cloud formation, pollination, combustion, and chemical mixing. Hence, a better understanding of turbulence can aid in fuel saving by reducing drag in the case of flow over solid surfaces, namely, cars, airplanes,...
doctoral thesis 2017
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Eisma, H.E. (author)
doctoral thesis 2017
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Pennings, P.C. (author)
This thesis describes the mechanisms with which tip vortex cavitation is responsible for broadband pressure fluctuations on ship propellers. Hypotheses for these are described in detail by Bosschers (2009). Validation is provided by three main cavitation-tunnel experiments, one on a model propeller and two on a stationary wing. These have...
doctoral thesis 2016
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Fiscaletti, D. (author)
The present work is an experimental and numerical investigation of the small-scale motions in turbulent free-shear flows. In the far-field turbulence of a jet at high Reynolds number (Re? = 350) hot-wire anemometry (HWA) is applied to measure time series of flow velocity. By filtering these time series, large- and small-scale velocity...
doctoral thesis 2016
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Drost, S. (author)
The efficiency of polymer extrusion processes can be severely limited by the occurrence of viscoelastic extrusion instabilities. In a para-aramid fibre spinning process, for example, a ?m-scale extrusion instability is responsible for the waste of tons of polymer per year. At present, a considerable amount of research literature is available on...
doctoral thesis 2015
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Tokgöz, S. (author)
Taylor-Couette flow is defined as the flow confined between two coaxial cylinders which can rotate independently. Several different flow states can be observed in the gap between the cylinders by changing the rotation speeds and the rotating directions of the cylinders. The aim of this thesis is to investigate the previously reported change of...
doctoral thesis 2014
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