2,230 research outputs found
sj-docx-1-wso-10.1177_17474930221124412 – Supplemental material for Monitoring for atrial fibrillation prior to patent foramen ovale closure after cryptogenic stroke
No full textSupplemental material, sj-docx-1-wso-10.1177_17474930221124412 for Monitoring for atrial fibrillation prior to patent foramen ovale closure after cryptogenic stroke by Hans-Christoph Diener, Rolf Wachter, Andrew Wong, Vincent Thijs, Renate B Schnabel, George Ntaios, Scott Kasner, Peter M Rothwell, Rod Passman, Jeffrey L Saver, Bert A Albers and Richard A Bernstein in International Journal of Stroke</p
A rod-linear cascade model for emulating rotor-stator interaction noise in turbofans: A numerical study
No full textThis manuscript presents a rod-linear cascade model for emulating rotor-stator interaction noise. The model is intended as a test platform for studying noise mitigation techniques for a turbofan fan stage, while it also extends the classical rod-airfoil configuration by considering a row of blades based on realistic geometrical details. The rod-linear cascade model consists of a rod positioned upstream of a 7-blade linear cascade, such that the rod wake impinges onto the central blade. The rod is scaled to obtain a fundamental shedding frequency equal to the first blade passing frequency of the NASA-Glenn Source Diagnostics Test (SDT)fan stage at approach condition. The cascade blade profile is also based on the OGV of the SDT sampled at 90% of the radial span. Subsequently, numerical simulations are performed using lattice-Boltzmann Method on a computational setup comprised of a contraction and a test section enclosing the rod-linear cascade model. The integral length scales of the rod wake and the mean loading of the central blade have been found to be in good agreement with the trends observed in the SDT fan stage. The primary noise sources are localized at the central blade leading edge, although noise propagation to the far-field is influenced by additional diffraction by the other blades. Furthermore, the acoustic-blade row interaction causes intense pressure fluctuation within the inter-blade channels, including in those that are not directly affected by the rod wake.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
Rod Korns
No full textPhoto showing J. Roderic ("Rod") Korns, a historian of western trails and author of "West from Fort Bridger
Understanding migratory flow caused by helicoid wire spacers in rod bundles: An experimental and theoretical study
No full textThe core of a Liquid Metal Fast Breeder Reactor (LMFBR) consists of cylindrical fuel rods that are wrapped by a helicoidally-wound wire spacer to enhance mixing and to prevent damage by fretting. It is known that the liquid metal close to the rod is forced to follow the wires, and that liquid metal further away from the rod crosses the wires (called: migratory flow). This work aims at gaining more insight into the physics behind migratory flow and to provide a model for its bending angle. To this purpose, the flow field in a 7-rods, wire-wrapped, hexagonal bundle with water is studied within the Reynolds number range of 4990–16330 by using Particle Image Velocimetry (PIV). Refraction of the light is minimized by using Fluorinated Ethylene Propylene (FEP), which is a refractive index-matching (RIM) material. These measurements confirm that liquid near the rod follows the helicoid path and bends cross-wise with respect to the wire further away from the rod. A theoretical model for the bending angle of the flow is derived from the Euler equations and shows that the bending is primarily caused by the pressure gradient field induced by the wire. The model shows a very good correspondence with the experimentally obtained PIV data. These findings improve our understanding of the physics at play in rod bundle flows with wrapped wires and can be of assistance in developing practical correlations for frictional pressure losses and heat transfer in such bundles.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Reactor Physics and Nuclear MaterialsRST/Radiation, Science and Technolog
Monitoring for AF: Identifying the Burden of Atrial Fibrillation and Assessing Post-Ablation
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Implantable Cardioverter Defibrillators and Quality of Life<subtitle>Results From the Defibrillators in Nonischemic Cardiomyopathy Treatment Evaluation Study</subtitle>
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