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Schuller, Tomás (author), Jalaal, Maziyar (author), Fanzio, P. (author), Galindo-Rosales, Francisco J. (author)The optimal design seeks the best possible solution(s) for a mechanical structure, device, or system, satisfying a series of requirements and leading to the best performance. In this work, optimized nozzle shapes have been designed for a wide range of polymer melts to be used in extrusion-based additive manufacturing, which aims to minimize...journal article 2024
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Gradl, P.R. (author), Cervone, A. (author), Colonna, Piero (author)Heat exchangers for use in propulsion applications are very critical components because they must be efficient, compact and light and often operate with working fluids at extreme temperatures or pressures or both. Various components and systems use heat exchangers such as combustion chambers of gas turbines and internal combustion engines, fuel...conference paper 2022
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Aghajani, S. (author), Accardo, A. (author), Tichem, M. (author)One of the essential requirements to create nanoparticle (NP)-based applications and functions is the ability to control their deposition in specific locations. Many methods have been proposed, with wet direct writing (DW) techniques such as inkjet printing being the most employed. These methods generally depend on off-line and solvent-based...journal article 2022
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Cervone, A. (author), Cordeiro Guerrieri, D. (author), de Athayde Costa e Silva, M. (author), Leverone, F.K. (author)Electrothermal propulsion can be seen as an intermediate concept between electrical and chemical propulsion. Propellant heating typically happens by means of a resistance (resistojet) or an electrical discharge (arcjet). For the extremely miniaturized applications that will be discussed in this chapter, resistojets are by far the most...book chapter 2022
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Noroozi, Reza (author), Zolfagharian, Ali (author), Fotouhi, M. (author), Bodaghi, Mahdi (author)Additive manufacturing (AM), as one of the most powerful manufacturing methods, is fabricating a three-dimensional (3D) structure using computer-aided design (CAD) data by adding material layer by layer. In contrast to traditional manufacturing processes that start from raw block material and remove waste materials, the AM process can...book chapter 2022
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Vesper, J.E. (author), Obiji, Chibuikem S. (author), Westerwaal, Ruud (author), Boelsma, Christiaan (author), Kenjeres, S. (author), Kleijn, C.R. (author)In recent years, Physical Vapor Deposition has been advanced to a continuous process which makes it amenable for in-line, high-quality and energy-efficient galvanization. To achieve the high and uniform mass flow required for in-line production, a Vapor Distribution Box is used, in which the zinc is evaporated. The zinc fills the Vapor...journal article 2021
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Fernández, E. (author), Ayas, C. (author), Langelaar, Matthijs (author), Duysinx, P. (author)Additive Manufacturing (AM) processes intended for large-scale components deposit large volumes of material to shorten process duration. This reduces the resolution of the AM process, which is typically defined by the deposition nozzle size. If the resolution limitation is not considered when designing for Large-Scale Additive Manufacturing ...journal article 2021
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Azzini, L. (author), Pini, M. (author), Colonna, Piero (author)An investigation on non-equilibrium condensing steam flow is conducted to attain a semi-analytical model for the prediction of the Wilson point up to the critical point. The database for the analysis includes experimental observations in various nozzles and conditions (ranging from 20 to 150 bar) taken from the literature as well as additional...journal article 2018
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Romanelli, G (author), Mignone, Andrea (author), Cervone, A. (author)Pulsed fusion propulsion might finally revolutionise manned space exploration by providing an affordable and relatively fast access to interplanetary destinations. However, such systems are still in an early development phase and one of the key areas requiring further investigations is the operation of the magnetic nozzle, the device meant to...journal article 2017
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Örley, F. (author), Trummler, T. (author), Hickel, S. (author), Mihatsch, M.S. (author), Schmidt, S.J. (author), Adams, N.A. (author)We employ a barotropic two-phase/two-fluid model to study the primary break-up of cavitating liquid jets emanating from a rectangular nozzle, which resembles a high aspect-ratio slot flow. All components (i.e., gas, liquid, and vapor) are represented by a homogeneous mixture approach. The cavitating fluid model is based on a thermodynamic...journal article 2015
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Agostinho, L.L.F. (author), Yurteri, C.U. (author), Wartena, J. (author), Brouwer, S.P. (author), Fuchs, E.C. (author), Marijnissen, J.C.M. (author)In this study, a multinozzle electrohydrodynamic atomization device was designed and studied for electrosprays in the simple-jet mode. Results have shown that the proposed device produces droplets with similar diameter in all nozzles, that the electric field creates a unique dispersion of the charged droplets and that it can operate under...journal article 2013
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Vuorinen, V. (author), Yu, J. (author), Tirunagari, S. (author), Kaario, O. (author), Larmi, M. (author), Duwig, C. (author), Boersma, B.J. (author)Large-eddy simulations (LES) based on scale-selective implicit filtering are carried out in order to study the effect of nozzle pressure ratios on the characteristics of highly underexpanded jets. Pressure ratios ranging from 4.5 to 8.5 with Reynolds numbers of the order 75?000–140?000 are considered. The studied configuration agrees well with...journal article 2013
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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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Migliaccio, A. (author), Zandbergen, B.T.C. (author), Nardini, F.T. (author), Louwerse, M.C. (author)The number of micro and nano satellite projects is expanding. Main focus is on providing these small satellites with the same capabilities as today's larger satellites. In the field of propulsion, efforts are on miniaturization of the on-board propulsion system. This though presents major challenges to the designers. TNO Defence, Security and...conference paper 2010
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Stachewicz, U. (author), Yurteri, C.U. (author), Marijnissen, J.C.M. (author), Dijksman, J.F. (author)This study demonstrates that the hydrodynamic phenomena taking place inside the capillary limits the frequency range of voltage pulses for stable single event electrospraying (SEE), when the meniscus/cone size is defined by the inner diameter of the nozzle. For the analysis of SEE, we used a one-dimensional model describing the displacement and...journal article 2009
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Veryovkin, A.A. (author), Tsirkunov, Y.M. (author)The paper describes the results of computational simulation of an unsteady two-phase gas-particle flow in a hypersonic shock tunnel. The tunnel consists of a heated shock tube, a convergent-divergent nozzle linked up with the low-pressure chamber of the tube, a test section where a model is placed, and a exhaust chamber. In calculations, the...conference paper 2006
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Odenthal, H.J. (author), Falkenreck, U. (author), Schlüter, J. (author)The three-dimensional, transient, non-isothermal flow of melt, slag and oxygen/argon is simulated for a 335 t combined blowing converter with six-hole top lance and 14 bottom tuyeres. The calculation is based on the Reynolds averaged Navier-Stokes (RANS) equations and the Standard k-epsilon model. The time-dependent formation of the melt...conference paper 2006
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Arian, M. (author), Tahsini, A.M. (author)Pulse detonation engine is a new concept across air-birthing propulsion systems. Today, due to the unsteady behavior of this type of engine, design optimizations are not completed yet. In this regard, recent studies are focused on the effects of nozzle implementation in this propulsion system. In this paper, the effect of nozzle shape (angle &...conference paper 2006
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Khan, I.M. (author), Gilbert, T. (author), Barigou, M. (author)The shape of the nozzle geometry is increasingly attractive in heating, ventilation and air conditioning applications. However an important consideration in the design of nozzle geometry is its effect on the dynamics of near flow field jet and to minimise the manufacturing cost for practical applications. In this investigation the effect of an...conference paper 2006
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Naghib-Lahouti, A. (author), Tolouei, E. (author)Aerospike nozzles are known to produce more thrust than conventional convergent-divergent nozzles in off-design conditions because of their capability to adapt their boundaries to ambient conditions. However, the central plug of an ideal aerospike nozzle can be very long and heavy, and its sharp end is susceptible to deformation in high...conference paper 2006
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