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Xie, M. (author)The risk of explosion due to rupture of a tank filled with pressurized liquefied gas (PLG) is one of the risks to be considered in the context of studies on tunnel safety. When a vessel containing liquid well above its boiling point at normal atmospheric pressure fails catastrophically a Boiling Liquid Expanding Vapour Explosion (BLEVE) can...doctoral thesis 2013
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Saldi, Z.S. (author)Extending the weldability of novel materials, and improving the weld quality by tailoring weld microstructures are key factors to obtain the welding techniques demanded in the modern manufacturing industries. This can be done, for example, by feeding chemical elements from a consumable wire into the weld pool during welding. The mixing of...doctoral thesis 2012
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Van de Wiel, B.J.H. (author), Moene, A.F. (author), Jonker, H.J.J. (author)The mechanism behind the collapse of turbulence in the evening as a precursor to the onset of the very stable boundary layer is investigated. To this end a cooled, pressure-driven flow is investigated by means of a local similarity model. Simulations reveal a temporary collapse of turbulence whenever the surface heat extraction, expressed in its...journal article 2012
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Van de Wiel, B.J.H. (author), Moene, A.F. (author), Jonker, H.J.J. (author), Baas, P. (author), Basu, S. (author), Donda, J.M.M. (author), Sun, J. (author), Holtslag, A.A.M. (author)The collapse of turbulence in the nocturnal boundary layer is studied by means of a simple bulk model that describes the basic physical interactions in the surface energy balance. It is shown that for a given mechanical forcing, the amount of turbulent heat that can be transported downward is limited to a certain maximum. In the case of weak...journal article 2012
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Malekzadeh, R. (author)transportation facilities. In an offshore oil and gas production facility, pipeline-riser systems are required to transport two-phase hydrocarbons from subsurface oil and gas wells to a central production platform. Severe slugs reaching several thousands pipe diameters may occur when transporting gas and liquid in these pipeline-riser systems....doctoral thesis 2012
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Kenjeres, S. (author), Pyrda, L. (author), Wrobel, W. (author), Fornalik-Wajs, E. (author), Szmyd, J.S. (author)We report experimental and numerical studies of combined natural and magnetic convection of a paramagnetic fluid inside a cubical enclosure heated from below and cooled from above and subjected to a magnetic field gradient. Values of the magnetic field gradient are in the range 9?|grad|b0|2|?900 T2/m for imposed magnetic field strengths in the...journal article 2012
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- Schalkwijk, J. (author), Griffith, E.J. (author), Post, F.H. (author), Jonker, H.J.J. (author) journal article 2012
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Oldenhof, E. (author)This dissertation examines stabilisation processes in turbulent non-premixed jet flames, created by injecting gaseous fuel into a co-flowing stream of hot, low-oxygen combustion products. Being able to predict whether and how a flame achieves stable and reliable combustion is a matter of great practical relevance, and a challenging scientific...doctoral thesis 2012
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Van der Voort, M.M. (author), Van den berg, A.C. (author), Roekaerts, D.J.E.M. (author), Xie, M. (author), De Bruijn, P.C.J. (author)Explosive evaporation of a superheated liquid is a relevant hazard in the process industry. A vessel rupture during storage, transport or handling may lead to devastating blast effects. In order to assess the risk associated with this hazard or to design protective measures, an accurate prediction model for the blast generated after vessel...journal article 2012
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- Leschziner, M.A. (author), Hanjalic, K, (author), Rodi, W. (author) journal article 2012
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- Neggers, R.A.J. (author), Siebesma, A.P. (author), Heus, T. (author) journal article 2011
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Neggers, R.A.J. (author), Heus, T. (author), Siebesma, A.P. (author)Overlap statistics of cumuliform boundary-layer clouds are studied using large-eddy simulations at high resolutions. The cloud overlap is found to be highly inefficient, due to the typical irregularity of cumuliform clouds over a wide range of scales. The detection of such inefficient overlap is enabled in this study by i) applying fine enough...journal article 2011
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Hanjalic, K. (author), Kenjeres, S. (author)The paper reports on the application of the Time-dependent Reynolds-Averaged Navier-Stokes (T-RANS) approach to analysing the effects of magnetic force and bottom-wall configuration on the reorganisation of a large coherent structure and its role in the transport processes in Rayleigh-Benard convection. The large-scale deterministic motion is...journal article 2011
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La Torre, F. (author)A new satellite philosophy, developed during the last two decades, suggests to make satellites smaller and lighter rather than bigger and heavier. In other words, large (?m3), single system satellites are being replaced by ?eets of small (?dm3), so-called micro-satellites. Future developmentsmay result in swarms ofmicro satellites ?ying through...doctoral thesis 2011
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- Gillissen, J.J.J. (author), Sundaresan, S. (author), Van den Akker, H.E.A. (author) journal article 2011
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Van Driel, R. (author), Jonker, H.J.J. (author)In this study the response of dry convective boundary layers to nonstationary surface heat fluxes is systematically investigated. This is relevant not only during sunset and sunrise but also, for example, when clouds modulate incoming solar radiation. Because the time scale of the associated change in surface heat fluxes may differ from case to...journal article 2011
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High Frequency Combustion Instabilities of LOx/CH4 Spray Flames in Rocket Engine Combustion ChambersSliphorst, M. (author)Ever since the early stages of space transportation in the 1940’s, and the related liquid propellant rocket engine development, combustion instability has been a major issue. High frequency combustion instability (HFCI) is the interaction between combustion and the acoustic field in the combustion chamber. It destroys the thermal boundary layer...doctoral thesis 2011
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Kenjeres, S. (author), Ten Cate, S. (author), Voesenek, C.J. (author)The present paper reports on numerical investigations of vortical structures in transient flow regimes generated by the local action of the Lorentz force on an electrically conductive fluid. The locally imposed non-uniform magnetic field generates similar effects as observed for flows over submerged solid obstacles. It is demonstrated that...journal article 2011
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De, A. (author), Oldenhof, E. (author), Sathiah, P. (author), Roekaerts, D. (author)In this paper, we report results of a numerical investigation of turbulent natural gas combustion for a jet in a coflow of lean combustion products in the Delft-Jet-in-Hot-Coflow (DJHC) burner which emulates MILD (Moderate and Intense Low Oxygen Dilution) combustion behavior. The focus is on assessing the performance of the Eddy Dissipation...journal article 2011
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Gryzlov, A.N. (author)The growing demand for hydrocarbon production has resulted into improved oilfield management with various control and optimization strategies. These strategies in turn strongly rely on the efficiency of downhole equipment which is used to obtain real-time oil and gas production rates with sufficient spatial and temporal resolution. In particular...doctoral thesis 2011