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  1. Article ; Online: Drag Force on a Starting Plate Scales with the Square Root of Acceleration.

    Reijtenbagh, J / Tummers, M J / Westerweel, J

    Physical review letters

    2023  Volume 130, Issue 17, Page(s) 174001

    Abstract: We report results on the instantaneous drag force on plates that are accelerated in a direction normal to the plate surface, which show that this force scales with the square root of the acceleration. This is associated with the generation and advection ... ...

    Abstract We report results on the instantaneous drag force on plates that are accelerated in a direction normal to the plate surface, which show that this force scales with the square root of the acceleration. This is associated with the generation and advection of vorticity at the plate surface. A new scaling law is presented for the drag force on accelerating plates, based on the history force for unsteady flow. This scaling avoids previous inconsistencies in using added mass forces in the description of forces on accelerating plates.
    Language English
    Publishing date 2023-05-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.174001
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    In stock of ZB MED Bonn / Germany

    Z 4' 58/153: Show issues

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  2. Article ; Online: Asymmetric cupula displacement due to endolymph vortex in the human semicircular canal.

    Goyens, J / Pourquie, M J B M / Poelma, C / Westerweel, J

    Biomechanics and modeling in mechanobiology

    2019  Volume 18, Issue 6, Page(s) 1577–1590

    Abstract: The vestibular system in the inner ear senses angular head manoeuvres by endolymph fluid which deforms a gelatinous sensory structure (the cupula). We constructed computer models that include both the endolymph flow (using CFD modelling), the cupula ... ...

    Abstract The vestibular system in the inner ear senses angular head manoeuvres by endolymph fluid which deforms a gelatinous sensory structure (the cupula). We constructed computer models that include both the endolymph flow (using CFD modelling), the cupula deformation (using FEM modelling), and the interaction between both (using fluid-structure interaction modelling). In the wide utricle, we observe an endolymph vortex. In the initial time steps, both the displacement of the cupula and its restorative forces are still small. As a result, the endolymph vortex causes the cupula to deform asymmetrically in an S-shape. The asymmetric deflection increases the cupula strain near the crista and, as a result, enhances the sensitivity of the vestibular system. Throughout the head manoeuvre, the maximal cupula strain is located at the centre of the crista. The hair cells at the crista centre supply irregularly spiking afferents, which are more sensitive than the afferents from the periphery. Hence, the location of the maximal strain at the crista may also increase the sensitivity of the semicircular canal, but this remains to be tested. The cupula overshoots its relaxed position in a simulation of the Dix-Hallpike head manoeuvre (3 s in total). A much faster head manoeuvre of 0.222 s showed to be too short to cause substantial cupula overshoot, because the cupula time scale of both models (estimated to be 3.3 s) is an order of magnitude larger than the duration of this manoeuvre.
    MeSH term(s) Adult ; Endolymph/physiology ; Female ; Humans ; Male ; Models, Biological ; Pressure ; Semicircular Canals/pathology ; Stress, Mechanical
    Language English
    Publishing date 2019-05-08
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2093052-5
    ISSN 1617-7940 ; 1617-7959
    ISSN (online) 1617-7940
    ISSN 1617-7959
    DOI 10.1007/s10237-019-01160-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 5966: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (2.OG)
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  3. Article ; Online: Improving rowing performance by adjusting oar blade size and angle.

    van Nieuwburg, W C A M / van Spreuwel, B J J / Tran, M T K / Yang, M D / Greidanus, A / Mulder, G / Tummers, M J / Westerweel, J / Suijker, W / van Wijk, R

    Frontiers in sports and active living

    2023  Volume 5, Page(s) 1109494

    Abstract: The principal aim of the work presented here is to investigate and demonstrate that a forward tilted rowing blade would result in a more efficient and effective motion of the blade through the water that would result in a higher boat speed when an equal ... ...

    Abstract The principal aim of the work presented here is to investigate and demonstrate that a forward tilted rowing blade would result in a more efficient and effective motion of the blade through the water that would result in a higher boat speed when an equal input power is provided. A 1:5 scaled rowing boat is used to determine the performance of rowing blades with different sizes and blade angles. This is used to validate the results of a previous study where the optimal blade angle of 15
    Language English
    Publishing date 2023-03-09
    Publishing country Switzerland
    Document type Journal Article
    ISSN 2624-9367
    ISSN (online) 2624-9367
    DOI 10.3389/fspor.2023.1109494
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  4. Article ; Online: Using Faraday Waves to Measure Interfacial Tension.

    Lau, Yuk Man / Westerweel, Jerry / van de Water, Willem

    Langmuir : the ACS journal of surfaces and colloids

    2020  Volume 36, Issue 21, Page(s) 5872–5879

    Abstract: We use Faraday waves to measure interfacial tension σ between two immiscible fluids, with an interest in (ultra)low values of σ. The waves are excited by vertically oscillating the container in which the fluids reside. Using linear stability theory, we ... ...

    Abstract We use Faraday waves to measure interfacial tension σ between two immiscible fluids, with an interest in (ultra)low values of σ. The waves are excited by vertically oscillating the container in which the fluids reside. Using linear stability theory, we map out the accessible range of interfacial tensions. The smallest value (σ
    Language English
    Publishing date 2020-05-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.0c00622
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  5. Article ; Online: Nanoscale contact line visualization based on Total Internal Reflection Fluorescence Microscopy.

    Franken, M J Z / Poelma, C / Westerweel, J

    Optics express

    2013  Volume 21, Issue 22, Page(s) 26093–26102

    Abstract: We describe a novel measurement method to study the contact line of a droplet at nanoscale level. The method is based on Total Internal Reflection Fluorescence Microscopy (TIRFM), which uses an evanescent excitation field produced by total internal ... ...

    Abstract We describe a novel measurement method to study the contact line of a droplet at nanoscale level. The method is based on Total Internal Reflection Fluorescence Microscopy (TIRFM), which uses an evanescent excitation field produced by total internal reflection of light. The evanescent field depends on the angle of the incident light and has an exponential intensity decay, characterized by the penetration depth. The penetration depth is determined by imaging a fluorescent particle probe that is traversed using an Atomic Force Microscopy (AFM) setup. The result confirms the exponential behavior of the evanescent field intensity, and the value of the penetration depth also corresponds with the value predicted based on the optical configuration. By using the intensity distribution of a fluorescent dye and the value for the penetration depth of the evanescent wave, it is possible to reconstruct the interface of a partial wetting droplet. The reconstructed interface based on TIRFM is in good agreement with the interface obtained from two reference measurements: non-disturbing AFM-imaging and conventional contact angle measurement. The latter lacks spatial resolution, while the former is limited to particular droplets. This new non-contact measurement does not suffer from these drawbacks, making it a very useful tool to study the fundamental wetting behavior of both stationary and dynamic interfaces.
    MeSH term(s) Equipment Design ; Equipment Failure Analysis ; Microscopy, Atomic Force/instrumentation ; Microscopy, Fluorescence/instrumentation ; Molecular Imaging/instrumentation ; Nanoparticles/ultrastructure ; Nanotechnology/instrumentation ; Reproducibility of Results ; Sensitivity and Specificity
    Language English
    Publishing date 2013-11-04
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.21.026093
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Effects of a Fence on Pollutant Dispersion in a Boundary Layer Exposed to a Rural-to-Urban Transition.

    Eisma, H E / Tomas, J M / Pourquie, M J B M / Elsinga, G E / Jonker, H J J / Westerweel, J

    Boundary-layer meteorology

    2018  Volume 169, Issue 2, Page(s) 185–208

    Abstract: Simultaneous particle-image velocimetry and laser-induced fluorescence combined with large-eddy simulations are used to investigate the flow and pollutant dispersion behaviour in a rural-to-urban roughness transition. The urban roughness is characterized ...

    Abstract Simultaneous particle-image velocimetry and laser-induced fluorescence combined with large-eddy simulations are used to investigate the flow and pollutant dispersion behaviour in a rural-to-urban roughness transition. The urban roughness is characterized by an array of cubical obstacles in an aligned arrangement. A plane fence is added one obstacle height
    Language English
    Publishing date 2018-07-03
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1477639-X
    ISSN 1573-1472 ; 0006-8314
    ISSN (online) 1573-1472
    ISSN 0006-8314
    DOI 10.1007/s10546-018-0367-1
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  7. Article ; Online: A comparison of the value of viscosity for several water models using Poiseuille flow in a nano-channel.

    Markesteijn, A P / Hartkamp, Remco / Luding, S / Westerweel, J

    The Journal of chemical physics

    2012  Volume 136, Issue 13, Page(s) 134104

    Abstract: The viscosity-temperature relation is determined for the water models SPC/E, TIP4P, TIP4P/Ew, and TIP4P/2005 by considering Poiseuille flow inside a nano-channel using molecular dynamics. The viscosity is determined by fitting the resulting velocity ... ...

    Abstract The viscosity-temperature relation is determined for the water models SPC/E, TIP4P, TIP4P/Ew, and TIP4P/2005 by considering Poiseuille flow inside a nano-channel using molecular dynamics. The viscosity is determined by fitting the resulting velocity profile (away from the walls) to the continuum solution for a Newtonian fluid and then compared to experimental values. The results show that the TIP4P/2005 model gives the best prediction of the viscosity for the complete range of temperatures for liquid water, and thus it is the preferred water model of these considered here for simulations where the magnitude of viscosity is crucial. On the other hand, with the TIP4P model, the viscosity is severely underpredicted, and overall the model performed worst, whereas the SPC/E and TIP4P/Ew models perform moderately.
    Language English
    Publishing date 2012-04-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/1.3697977
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    In stock of ZB MED Bonn / Germany

    Z 4' 49/16: Show issues

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  8. Article ; Online: Quantification of blood flow and topology in developing vascular networks.

    Kloosterman, Astrid / Hierck, Beerend / Westerweel, Jerry / Poelma, Christian

    PloS one

    2014  Volume 9, Issue 5, Page(s) e96856

    Abstract: Since fluid dynamics plays a critical role in vascular remodeling, quantification of the hemodynamics is crucial to gain more insight into this complex process. Better understanding of vascular development can improve prediction of the process, and may ... ...

    Abstract Since fluid dynamics plays a critical role in vascular remodeling, quantification of the hemodynamics is crucial to gain more insight into this complex process. Better understanding of vascular development can improve prediction of the process, and may eventually even be used to influence the vascular structure. In this study, a methodology to quantify hemodynamics and network structure of developing vascular networks is described. The hemodynamic parameters and topology are derived from detailed local blood flow velocities, obtained by in vivo micro-PIV measurements. The use of such detailed flow measurements is shown to be essential, as blood vessels with a similar diameter can have a large variation in flow rate. Measurements are performed in the yolk sacs of seven chicken embryos at two developmental stages between HH 13+ and 17+. A large range of flow velocities (1 µm/s to 1 mm/s) is measured in blood vessels with diameters in the range of 25-500 µm. The quality of the data sets is investigated by verifying the flow balances in the branching points. This shows that the quality of the data sets of the seven embryos is comparable for all stages observed, and the data is suitable for further analysis with known accuracy. When comparing two subsequently characterized networks of the same embryo, vascular remodeling is observed in all seven networks. However, the character of remodeling in the seven embryos differs and can be non-intuitive, which confirms the necessity of quantification. To illustrate the potential of the data, we present a preliminary quantitative study of key network topology parameters and we compare these with theoretical design rules.
    MeSH term(s) Animals ; Blood Flow Velocity/physiology ; Chick Embryo ; Hemodynamics/physiology ; Regional Blood Flow/physiology
    Language English
    Publishing date 2014-05-13
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0096856
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  9. Article ; Online: Observation of hydrophobic-like behavior in geometrically patterned hydrophilic microchannels.

    Parikesit, G O F / Vrouwe, E X / Blom, M T / Westerweel, J

    Biomicrofluidics

    2010  Volume 4, Issue 4, Page(s) 44103

    Abstract: We present our observation of meta-hydrophobicity, where geometrically patterned surfaces make hydrophilic microchannels exhibit hydrophobic-like behaviors. We analyze the wetting-induced energy decrease that results from the surface geometries and ... ...

    Abstract We present our observation of meta-hydrophobicity, where geometrically patterned surfaces make hydrophilic microchannels exhibit hydrophobic-like behaviors. We analyze the wetting-induced energy decrease that results from the surface geometries and experimentally demonstrate how those geometries can modulate the dynamics of capillary-driven wetting and evaporation-driven drying of microfluidic systems. Our results also show that the modulated wetting dynamics can be employed to generate regulated patterns of microbubbles.
    Language English
    Publishing date 2010-10-08
    Publishing country United States
    Document type Journal Article
    ISSN 1932-1058
    ISSN (online) 1932-1058
    DOI 10.1063/1.3499416
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  10. Book ; Conference proceedings: Particle image velocimetry

    Stanislas, Michel / Westerweel, J

    recent improvements ; proceedings of the EUROPIV 2 Workshop held in Zaragoza, Spain, March 31 - April 1, 2003

    2004  

    Event/congress EUROPIV 2 Workshop (2003.03.31-04.01, Zaragoza)
    Author's details M. Stanislas ... (ed.)
    Keywords Particle image velocimetry ; Particle-Image-Velocimetry
    Language English
    Size IX, 426 S, Ill., graph. Darst, 24 cm
    Publisher Springer
    Publishing place Berlin u.a.
    Document type Book ; Conference proceedings
    Note Literaturangaben ; Workshop within the EUROPIV 2 research program (April 2000 - June 2003), funded by the European Community
    Accompanying material 1 CD-ROM (12 cm)
    ISBN 3540214232 ; 9783540214236
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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