Searched for: contributor:"Westerweel, J. (promotor)"
(1 - 20 of 22)

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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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Warncke, N.G.W. (author)
This thesis studies the hydrodynamics of froth flotation, a process that is used in industry as a means of removing small inclusions from the treated liquid by gas bubble injection. This work is particularly motivated by the removal of aluminium and silicon oxides from liquid steel. Hydrodynamic aspects have a strong influence on the efficiency...
doctoral thesis 2014
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Oldenziel, G. (author)
Liquid droplets occur in many natural phenomena and play an important role in a large number of industrial applications. One of the distinct properties of droplets as opposed to solid particles is their ability to merge, or coalesce upon collision. Coalescence of liquid drops is of importance in for example the food industry, where the shelf...
doctoral thesis 2014
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Franken, M.J.Z. (author)
Despite the fact that moving droplets are very common, a moving contact line is a longstanding fundamental challenge in the field of fluid mechanics. This fundamental challenge is the main topic of this thesis in the context of ASML immersion lithography equipment. In Chapter 2 an overview of existing theoretical and experimental work is given,...
doctoral thesis 2014
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Zverkhovskyi, O. (author)
doctoral thesis 2014
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Kloosterman, A. (author)
The work described in this PhD thesis has been carried out to improve insight into the relation between changing vascular network structures and their corresponding hemodynamics. Accurate quantitative information about the changing hemodynamics has been obtained experimentally from developing extraembryonic vascular networks of chicken embryos,...
doctoral thesis 2013
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Kim, H. (author)
This thesis is a work on a contact line instability at a finite Reynolds number, 0 < Re < O(100). This problem corresponds to an immersion droplet applied in a liquid- immersion lithography machine. We perform extensive works to understand this instability problem by means of experimental, numerical, and theoretical ways. First, in order to...
doctoral thesis 2013
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Harleman, M.J.W. (author)
Previous research has shown that the addition of gas bubbles to a turbulent boundary layer in water can reduce the local skin-friction drag by up to 80%. Application of this technique to ships seems promising, but to date no significant drag reductions are obtained on full-scale ships. More knowledge about the drag reduction mechanism is...
doctoral thesis 2012
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Koschatzky, V. (author)
This thesis deals with the problem of noise. Sound is a constant presence in our lives. Most of the times it is something wanted and it serves a purpose, such as communication through speech or entertainment by listening to music. On the other hand, quite often sound is an annoying and unwanted by-product of some other activity necessary to us....
doctoral thesis 2011
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Kuik, D.J. (author)
In this thesis the transition to turbulence in pipe flow is investigated. At low Reynolds numbers, the flow returns to the laminar state spontaneously. At high Reynolds number a small perturbation causes the flow to suddenly become turbulent. In the intermediate regime localized turbulence is observed. This regime is investigated using...
doctoral thesis 2011
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Hussong, J. (author)
Artificial cilia-driven fluid transport in microfluidic devices is a newly emerging research topic that came into focus during the last five years. Artificial cilia can be described as wall-attached elongated structures that perform an externally actuated periodic beat cycle to manipulate fluids on sub-millimeter scale. The periodic motion of...
doctoral thesis 2011
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Markesteijn, A.P. (author)
One of the most important developments in the last centuries is the process of miniaturisation and understanding everything that it entails. For the physical sciences this meant the continuing discovery what matter is and how it behaves, while from a practical point of view it meant that more advanced medical, scientific, and consumer...
doctoral thesis 2011
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Rops, C.M. (author)
New production techniques, which became available since the 1980’s, allowed the mass production of small sized fluidic systems. Reducing the size of a technical system alters the performance due to scaling effects. Physical phenomena which operate on volumes, such as gravity and inertia, become less important with respect to physical phenomena...
doctoral thesis 2009
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Ooms, T.A. (author)
This thesis contributes to the development of an instrument that can measure fluid flow velocity in a three-dimensional (3D) measurement domain by holographic imaging.
doctoral thesis 2008
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Vennemann, P. (author)
The development, the regulation, and the pathology of the circulatory system (e.g. cardiogenesis, thermoregulation, atherosclerosis) are determined by blood flow induced mechanical forces. While this proposition has been confirmed during recent years, the exact mechanisms still remain unclear. This is mainly due to the fact that those forces...
doctoral thesis 2008
Searched for: contributor:"Westerweel, J. (promotor)"
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