Searched for: subject%3A%22Pressure%255C%2Beffects%22
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Massaad, J. (author), van Neer, P.L.M.J. (author), van Willigen, D.M. (author), de Jong, N. (author), Pertijs, M.A.P. (author), Verweij, M.D. (author)
Acoustic wave propagation in ultrasonic flow measurements is typically assumed to be linear and reciprocal.However, if the transmitting transducer generates a sufficiently high pressure, nonlinear wave propagation effects become significant. In flow measurements, this would translate into more information to estimate the flow and therefore a...
article 2021
document
Nakiboglu, G. (author), Belfroid, S.P.C. (author), Willems, J.F.H. (author), Hirschberg, A. (author)
Whistling behavior of two geometrically periodic systems are investigated: corrugated pipes and a multiple side branch system. In both systems frequency (Helmholtz number) is a non-decreasing piecewise constant function of the Mach number, whose increase on average is approximately linear. The plateaus, lock-in frequencies, of this piecewise...
article 2010
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Slot, H.J. (author), Meulendijks, D. (author), Smeulers, J.P.M. (author), TNO Industrie en techniek (author)
Surge of turbo compressors can cause large stepwise changes in flow and pressure, which can potentially damage the compressor and any equipment that is in direct connection with the compressor. Surge is usually avoided by an anti surge controller (ASC). However, in spite of the ASC surge cycles may occur. A more robust approach is therefore to...
conference paper 2009
document
van Bergen, F. (author), Krzystolik, P. (author), van Wageningen, N. (author), Pagnier, H. (author), Jura, B. (author), Skiba, J. (author), Winthaegen, P. (author), Kobiela, Z. (author), TNO Bouw en Ondergrond (author)
A pilot site for CO2 storage in coal seams was set-up in the Upper Silesian Coal Basin in Poland in the scope of the RECOPOL project, funded by the European Commission. About 760 tons CO2 were injected into the reservoir from August 2004 to June 2005. Breakthrough of the injected CO2 was established, which resulted in the production of about 10%...
article 2009
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Klein-Douwel, R.J.H. (author), Frijters, P.J.M. (author), Seykens, X.L.J. (author), Somers, L.M.T. (author), Baert, R.S.G. (author), TNO Industrie en Techniek (author)
Formation of nonevaporating sprays from diesel fuel injection through a realistic heavy duty multihole common rail injector is studied in a newly developed high-pressure, high-temperature cell, using digital highspeed shadowgraphy at 4500 frames/s. Gas pressure was varied from 13 to 37 bar (corresponding to densities of 15-42 kg/m3, using N2 at...
article 2009
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Kudryavtsev, Y.V. (author), Gelinck, E.R.M. (author), Fischer, H.R. (author), TNO Industrie en Techniek (author)
A theoretical investigation of van der Waals forces acting between two solid silicon surfaces at separations from zero to approximately 20 nm is presented. We focused our efforts on the analysis of different factors that can cause deviations from the classical pressure-distance dependence p ∼ 1/D3. It is demonstrated that a layer (oxide or water...
article 2009
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Bouma, R.H.B. (author), Boluijt, A.G. (author), Verbeek, H.J. (author), van der Heijden, A.E.D.M. (author), TNO Defensie en Veiligheid (author)
Impact testing of various cyclotrimethylene trinitramine (RDX) samples has been carried out with the Ballistic Impact Chamber (BIC). Numerical simulations have been performed to guide its experimental design and explain the phenomena that are observed in the measured pressure evolution. The experimental results obtained with the BIC are compared...
article 2008
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Nelskamp, S. (author), David, P. (author), Littke, R. (author), TNO Bouw en Ondergrond (author)
Sedimentary basins in The Netherlands contain significant amounts of hydrocarbon resources, which developed in response to temperature and pressure history during Mesozoic and Cenozoic times. Quantification and modelling of burial, maturity and temperature histories are the major goals of this study, allowing for a better understanding of the...
article 2008
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Balguid, A. (author), Rubbens, M.P. (author), Mol, A. (author), Bank, R.A. (author), Bogers, A.J.J.C. (author), van Kats, J.P. (author), de Mol, B.A.J.M. (author), Baaijens, F.P.T. (author), Bouten, C.V.C. (author), TNO Kwaliteit van Leven (author)
A major challenge in tissue engineering of functional heart valves is to determine and mimic the dominant tissue structures that regulate heart valve function and in vivo survival. In native heart valves, the anisotropic matrix architecture assures sustained and adequate functioning under high-pressure conditions. Collagen, being the main load...
article 2007
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Woolf, D.K. (author), Leifer, I.S. (author), Nightingale, P.D. (author), Rhee, T.S. (author), Bowyer, P. (author), Caulliez, G. (author), de Leeuw, G. (author), Larsen, S.E. (author), Liddicoat, M. (author), Baker, J. (author), Andreae, M.O. (author), TNO Defensie en Veiligheid (author)
The air-water exchange of gases can be substantially enhanced by wave breaking and specifically by bubble-mediated transfer. A feature of bubble-mediated transfer is the additional pressure on bubbles resulting from the hydrostatic forces on a submerged bubble and from surface tension and curvature. This peculiarity results in asymmetry of...
article 2007
document
Ljevar, S. (author), de Lange, H.C. (author), van Steenhoven, A.A. (author), TNO Industrie en Techniek (author)
We report a numerical study on the vaneless diffuser core flow instability in centrifugal compressors. The analysis is performed for the purpose of better understanding of the rotating stall flow mechanism in radial vaneless diffusers. Since the analysis is restricted to the two-dimensional core flow, the effect of the wall boundary layers is...
article 2006
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Schmeitz, A.J.C. (author), Besselink, I.J.M. (author), de Hoogh, J. (author), Nijmeijer, H. (author), TNO Industrie en Techniek (author)
The Magic Formula and SWIFT tyre models are well-known semi-empirical tyre models for vehicle dynamic simulations. Up to now, the only way to account for inflation pressure changes is to identify all model parameters for each inflation pressure that has to be considered. Since this is a time consuming and consequently expensive activity,...
article 2005
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Meijerink, M.G.H. (author), Nieuwkoop, E. (author), Veninga, E.P. (author), Meuwissen, M.H.H. (author), Tijdink, M.W.W.J. (author), TNO Industrie en Techniek (author)
A capacitive pressure sensor was realized by means of a post-processing step on a low temperature co-fired ceramics (LTCC) substrate. The new sensor fabrication technology allows for integration of the sensor with interface circuitry and possibly also wireless transmission circuits on LTCC substrates to realize a truly autonomous sensor unit. A...
article 2005
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Jacobs, M.A. (author), Breeuwer, R. (author), Kemmere, M.F. (author), Keurentjes, J.T.F. (author), TNO Industrie en Techniek (author)
Contactless fluid level detection in process equipment is an important challenge for the process automation industry, especially under high-pressure conditions. In this study, a method is presented, which permits the contactless measurement of liquid levels in thin opaque capillaries at high pressures. The method is based on the mass dependence...
article 2005
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Zijl, W. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)
Inverse models to determine the permeability are generally based on existing forward models for the pressure. The permeabilities are adapted in such a way that the calculated pressures match the specified pressures in a number of points. To assimilate a priori knowledge about the flux, we introduce the 'flux assimilation method', which is based...
article 2004
document
Ainslie, M.A. (author), Robins, A.J. (author), Simons, D.G. (author), TNO Fysisch en Elektronisch Laboratorium (author)
A compilation of analytical formulas is presented, describing ray properties of a family of sediment sound speed profiles. The profiles are described as "generalized power law" profiles because they are generalizations of a similar family of simpler power law profiles considered in earlier work [M. A. Ainslie, J. Acoust. Soc. Am. 96, 2506–2515 ...
article 2004
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Marsanich, K. (author), Barontini, F. (author), Cozzani, V. (author), Creemers, A.F.L. (author), Kersten, R.J.A. (author), Prins Maurits Laboratorium TNO (author)
Article 2 of European Community Directive 96/82/EC (known as 'Seveso-II' Directive) also requires consideration in the plant inventory of the dangerous substances 'which it is believed may be generated in the loss of control of an industrial chemical process'. The present study was directed to the further development and assessment of procedures...
article 2004
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Snellen, M. (author), van Lier, L.J. (author), Golliard, J. (author), Védy, E. (author), Technisch Physische Dienst TNO - TH (author)
In this paper an engineering method for the prediction of noise generated by a turbulent flow is presented. The presented approach is based on the assumption that the acoustic phenomena do not provide feedback to the turbulence. Thus, parameters such as the turbulent kinetic energy and the integral length scale can be obtained from Reynolds...
conference paper 2003
document
Wierenga, P.A. (author), Meinders, M.B.J. (author), Egmond, M.R. (author), Voragen, F.A.G.J. (author), de Jongh, H.H.J. (author)
Using native and caprylated ovalbumin, the role of exposed hydrophobicity on the kinetics of protein adsorption to the air - water interface is studied. First, changes in the chemical properties of the protein upon caprylation were characterized followed by measurement of the changes in adsorption kinetics. No change in the molecular structure...
article 2003
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den Hartog, E.A. (author), Heus, R. (author), TNO Technische Menskunde (author)
The requirements to maintain a positive pressure with respiratory protection during heavy exercise and the effects on ventilation and feelings of discomfort were investigated. Eight male subjects participated, using the respirator system during rest and exercise at about 80% of their individual maximum power. A blower was used at maximum and...
article 2003
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