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Micro-PIV study on the influence of viscosity on the dynamics of droplet impact onto a thin film Exp. Fluids (IF 2.4) Pub Date : 2024-04-20 Stefan Schubert, Jonas Steigerwald, Anne K. Geppert, Bernhard Weigand, Grazia Lamanna
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Stereo-PIV measurements within the canopy in open-channel flows Exp. Fluids (IF 2.4) Pub Date : 2024-04-18 Michele Trevisson, Yulia Akutina, Olivier Eiff
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Particle tracking velocimetry and trajectory curvature statistics for particle-laden liquid metal flow in the wake of a cylindrical obstacle Exp. Fluids (IF 2.4) Pub Date : 2024-04-18 Mihails Birjukovs, Peteris Zvejnieks, Tobias Lappan, Martins Klevs, Sascha Heitkam, Pavel Trtik, David Mannes, Sven Eckert, Andris Jakovics
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Hexagonal roughness characterization in turbulent flow Exp. Fluids (IF 2.4) Pub Date : 2024-04-15 Mark A. Miller, Zarif M. Rahman, Sean C. C. Bailey
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Interferometry analysis and CARS measurements of nonequilibrium in hypersonic oxygen/argon and pure oxygen flows Exp. Fluids (IF 2.4) Pub Date : 2024-04-13 Juan J. Anaya, Nicholas S. Manavi, Albina A. Tropina, Arthur Dogariu, Richard B. Miles, Maninder S. Grover
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Experimental assessment of square-wave spatial spanwise forcing of a turbulent boundary layer Exp. Fluids (IF 2.4) Pub Date : 2024-04-13 Max W. Knoop, Friso H. Hartog, Ferdinand F. J. Schrijer, Olaf W. G. van Campenhout, Michiel van Nesselrooij, Bas W. van Oudheusden
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Calorimetric wall-shear-stress microsensors for low-speed aerodynamics Exp. Fluids (IF 2.4) Pub Date : 2024-04-12 Julien Weiss, Alain Giani
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Investigation of tyre rim protectors on the aerodynamics of a passenger vehicle Exp. Fluids (IF 2.4) Pub Date : 2024-04-10 Erik Josefsson, Francesco Fabio Semeraro, Magnus Urquhart, Simone Sebben
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The combined influence of spin and roughness frequency on sphere aerodynamics Exp. Fluids (IF 2.4) Pub Date : 2024-04-05 Jack Elliott, Lloyd Smith, Bin Lyu, Barton L. Smith
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Neural-network-enhanced line-of-sight method for 3D particle cloud reconstruction in particle tracking velocimetry Exp. Fluids (IF 2.4) Pub Date : 2024-04-03 Jianyu Dou, Chong Pan, Yukun Han, Yuan Xiong, Jinjun Wang
The algorithm of three-dimensional (3D) particle cloud reconstruction is a building block for 3D particle tracking velocimetry (3D-PTV). In the present study, a new 3D particle cloud reconstruction algorithm, i.e., neural-network-enhanced line of sight (NN-LOS), is proposed to update the traditional method based on Line of Sight (LOS) algorithm. The essence of NN-LOS is to use a matching neural network
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Tomographic flow measurements over additively manufactured cooling channel roughness Exp. Fluids (IF 2.4) Pub Date : 2024-04-01
Abstract Additive manufacturing (AM) offers many potential advantages to constructing gas turbine components such as allowing for more complex geometry in carefully optimized designs. AM processes, such as direct laser sintering, create roughness with distinct characteristics including periodicity from layers of fused material and varying roughness element size depending on surface print orientation
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Three-dimensional time-resolved Lagrangian flow field reconstruction based on constrained least squares and stable radial basis function Exp. Fluids (IF 2.4) Pub Date : 2024-03-31 Lanyu Li, Zhao Pan
The three-dimensional time-resolved Lagrangian particle tracking (3D TR-LPT) technique has recently advanced flow diagnostics by providing high spatiotemporal resolution measurements under the Lagrangian framework. To fully exploit its potential, accurate and robust data processing algorithms are needed. These algorithms are responsible for reconstructing particle trajectories, velocities, and differential
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Wall shear stress measurement using a zero-displacement floating-element balance Exp. Fluids (IF 2.4) Pub Date : 2024-03-30 M. Aguiar Ferreira, P. Costa, B. Ganapathisubramani
The floating-element (FE) principle, introduced nearly a century ago, remains one of the most versatile direct wall shear stress measurement methods. Yet, its intrinsic sources of systematic error, associated with the flow-exposed gap, off-axis load sensitivity, and calibration, have thus far limited its widespread application. In combination with the lack of standard designs and testing procedures
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Depth from defocus technique: a simple calibration-free approach for dispersion size measurement Exp. Fluids (IF 2.4) Pub Date : 2024-03-27
Abstract Particle size measurement is crucial in various applications, be it sizing droplets in inkjet printing or respiratory events, tracking particulate ejection in hypersonic impacts or detecting floating target markers in free-surface flows. Such systems are characterised by extracting quantitative information like size, position, velocity and number density of the dispersed particles, which is
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Spatially resolved measurement of the electrostatic charge of turbulent powder flows Exp. Fluids (IF 2.4) Pub Date : 2024-03-25
Abstract This article reports on measurements of the electrostatic charge of particles in a turbulent duct flow. In contrast to previous charge measurements, which do not apply to turbulent flows or give only the sum of all particles’ charges, the new method resolves the charge of a turbulent powder flow spatially. The experiment consists of a particle tracking velocimetry (PTV) system and electrode
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Coherent pressure and acceleration estimation from triply decomposed turbulent bluff-body wakes Exp. Fluids (IF 2.4) Pub Date : 2024-03-23 Roshan Shanmughan, Pierre-Yves Passaggia, Nicolas Mazellier, Azeddine Kourta
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Size and velocity correlation for splashing droplets generated by jet impingement Exp. Fluids (IF 2.4) Pub Date : 2024-03-22 Qin Zeng, David Z. Zhu, Shangtuo Qian, Hui Xu, Jiangang Feng, Han Ye, Pengcheng Li
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Experimental optimization of a fish robot’s swimming modes: a complex multiphysical problem Exp. Fluids (IF 2.4) Pub Date : 2024-03-20 Shokoofeh Abbaszadeh, Stefan Hoerner, Roberto Leidhold
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Improving depth uncertainty in plenoptic camera-based velocimetry Exp. Fluids (IF 2.4) Pub Date : 2024-03-19
Abstract This work describes the development of a particle tracking velocimetry (PTV) algorithm designed to improve three-dimensional (3D), three-component velocity field measurements using a single plenoptic camera. Particular focus is on mitigating the longstanding depth uncertainty issues that have traditionally plagued plenoptic particle image velocimetry (PIV) experiments by leveraging the camera’s
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Influence of vehicle back shape on wheel-vehicle aerodynamic interactions: a model study Exp. Fluids (IF 2.4) Pub Date : 2024-03-19 Di Bao, Jacques Borée, Christophe Sicot, Côme Roebroeck
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Effect of superhydrophobic surfaces on rod bundle flow dynamics Exp. Fluids (IF 2.4) Pub Date : 2024-03-16
Abstract Pressurized water reactors are designed to operate in a single-phase flow. However, during a flow loss or other off-design conditions liquid temperature may exceed saturation temperature and, if a continuous film of gas forms, a boiling casualty may result. If superhydrophobic surfaces are introduced among the fuel cell assembly, vapor bubbles show an affinity to these surfaces and gas may
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Nearly homogeneous and isotropic turbulence generated by the interaction of supersonic jets Exp. Fluids (IF 2.4) Pub Date : 2024-03-15
Abstract This study reports the development and characterization of a multiple-supersonic-jet wind tunnel designed to investigate the decay of nearly homogeneous and isotropic turbulence whose generation process is strongly influenced by fluid compressibility. The interaction of 36 supersonic jets generates turbulence that decays in the streamwise direction. The velocity field is measured with particle
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Adopting molecular tagging velocimetry for high-resolution measurements of oscillating grid turbulence Exp. Fluids (IF 2.4) Pub Date : 2024-03-14 Bhaarath Ramesh, Joseph C. Klewicki, Jimmy Philip
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Measurement of freestream noise in a hypersonic wind tunnel Exp. Fluids (IF 2.4) Pub Date : 2024-03-13 Premika S. Thasu, Subrahmanyam Duvvuri
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Response of hot-wire anemometry to transient flow induced by weak pressure waves Exp. Fluids (IF 2.4) Pub Date : 2024-03-12 Tokuzo Miyachi, Takakage Arai, Shoji Sakaue, Koji Takashima
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Experimental investigation of gravitational instabilities at the particle suspension-fluid interface Exp. Fluids (IF 2.4) Pub Date : 2024-03-12 Junwei Guo, Qi Zhou, Yadong Zhang, Ron Chik-Kwong Wong
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Simultaneous film temperature and film thickness measurements for jet impingement applications using two-color laser-induced fluorescence Exp. Fluids (IF 2.4) Pub Date : 2024-03-11 Matthias Koegl, Nikita Mil‘to, Lars Zigan
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Spatial superresolution based on simultaneous dual PIV measurement with different magnification Exp. Fluids (IF 2.4) Pub Date : 2024-03-11 Yuta Ozawa, Harutaka Honda, Taku Nonomura
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Experimental study on the impact behaviors of a water drop on immiscible oil surfaces: bouncing, compound central jet formation and crater evolution Exp. Fluids (IF 2.4) Pub Date : 2024-03-07
Abstract The impact of the drop on an immiscible liquid surface is common in many applications, where differences in physical properties like viscosity and thickness of the target liquid layer are crucial to the impact outcomes. We experimentally investigate the effect of dimensionless thickness \(\beta\) (ratio of film thickness to drop diameter) and dimensionless viscosity (ratio of film viscosity
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Velocity measurements in particle-laden high-enthalpy flow using non-intrusive techniques Exp. Fluids (IF 2.4) Pub Date : 2024-03-06 Ciro Salvi, Ali Gülhan
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Flow mechanism study and geometrical parameters analysis of fluidic oscillators based on pressure-sensitive paint measurements and modal analysis Exp. Fluids (IF 2.4) Pub Date : 2024-03-03 Jinsheng Song, Shiqi Wang, Zihao Qiu, Di Peng, Yingzheng Liu, Xin Wen
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Probing dynamics of elliptical vortex rings via direct vorticity measurements with digital inline holography Exp. Fluids (IF 2.4) Pub Date : 2024-03-02 Jiaqi Li, Jiarong Hong
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Frequency response of separated flows on a plunging finite wing with spoilers Exp. Fluids (IF 2.4) Pub Date : 2024-03-02 Michail Hadjipantelis, Onur Son, Zhijin Wang, Ismet Gursul
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Feasibility study of in-line particle image velocimetry Exp. Fluids (IF 2.4) Pub Date : 2024-02-28
Abstract This article describes recent tests and developments of imaging and evaluation techniques for particle image velocimetry (PIV) that exploit the forward scattering of tracer particles by placing the camera in-line with the illuminating light source, such as a laser or a light emitting diode. These techniques have been in use for some time in microscopy and in the design of optical instruments
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Effects of salt concentration on top wall bubble injection in a turbulent channel flow: bubble dynamics and wall drag reduction Exp. Fluids (IF 2.4) Pub Date : 2024-02-25 Subhajit Biswas, Raghuraman N. Govardhan
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Lagrangian study of entrainment for confined vortex rings in dense suspensions using echo-LPT Exp. Fluids (IF 2.4) Pub Date : 2024-02-24
Abstract An ultrasound-based Lagrangian particle tracking (echo-LPT) method is used to investigate path-dependent quantities for confined vortex rings in dense suspensions with volume fractions up to 40%. The echo-LPT measurement technique is successfully validated through a close comparison of the pixel displacements collected with established ultrasound image velocimetry methods. The carrier phase
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Statistical analysis of flow field variations via independent component analysis Exp. Fluids (IF 2.4) Pub Date : 2024-02-23 J. Laichter, P. Kranz, S. A. Kaiser
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Machine learning-aided investigation of immiscible droplet impact on liquid pools across varying depths and droplet viscosities Exp. Fluids (IF 2.4) Pub Date : 2024-02-20 Mohammad Autif Shahdhaar, Arpan Srivastava, Atul Srivastava
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Challenges of deep unsupervised optical flow estimation for particle-image velocimetry data Exp. Fluids (IF 2.4) Pub Date : 2024-02-19 Christian Lagemann, Kai Lagemann, Sach Mukherjee, Wolfgang Schröder
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Experimental investigation of yaw-angle effects on drag reduction rate for trapezoidal riblets Exp. Fluids (IF 2.4) Pub Date : 2024-02-16
Abstract Effects of the yaw angle on the drag reduction rate of riblets were investigated experimentally for trapezoidal riblets with ridge angle of \(30^\circ\) and height-to-spacing ratio of 0.5 in a turbulent wind channel at Reynolds numbers (based on the friction velocity and channel half depth) \(\textrm{Re}_\tau = 520 - 2100\) . Drag reduction rates were estimated carefully by comparing the streamwise
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Experimental investigation on the effect of boundary conditions and spatial resolution on pressure from PIV for oscillating internal flow Exp. Fluids (IF 2.4) Pub Date : 2024-02-14 Nazmus Sakib, Zhao Pan, James T. Wiswall, Alexander G. Mychkovsky, Barton L. Smith
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How seams alter boundary layer separation points on baseballs Exp. Fluids (IF 2.4) Pub Date : 2024-02-12 Barton L. Smith, John Garrett, Patrick Dufour, Erica Francis
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Droplet arrival pattern, clustering and settling velocity in a polydisperse droplet field Exp. Fluids (IF 2.4) Pub Date : 2024-02-09
Abstract Understanding the onset of clustering is an essential consideration in many engineering and natural systems. High operating costs and sophisticated methods associated with the existing spatial measurement techniques in clustering analysis call upon the use of low-dimensional measurements. In this experimental study, we study the 1D temporal droplet diameter data in a polydisperse droplet field
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Towards adaptive drag reduction of a flat-back 3D bluff body in variable pitch and crosswind by flow orientation at the base separation Exp. Fluids (IF 2.4) Pub Date : 2024-02-07
Abstract The sensitivity of the drag to the rear design of a flat-back body is investigated under different body attitudes defined by the pitch ( \(-1.5^\circ , 0^\circ , +1.5^\circ\) ) and yaw (up to \(15^\circ\) ). The rear design consists of taper angles at the top and bottom trailing edge varying from \(0^\circ\) (no taper) to \(12.5^\circ\) . Compared to the fixed optimal rear design that minimizes
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Maximum likelihood filtering for particle tracking in turbulent flows Exp. Fluids (IF 2.4) Pub Date : 2024-02-07
Abstract Lagrangian particle tracking enables practitioners to study various concepts in turbulence by measuring particle positions in flows of interest. These data are subject to measurement errors; filtering techniques are applied to mitigate these errors and improve the accuracy of analyses utilizing the data. We develop a new type of position filter through use of maximum likelihood estimation
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On the scalability of helium-filled soap bubbles for volumetric PIV Exp. Fluids (IF 2.4) Pub Date : 2024-02-04 Adrian Grille Guerra, Fulvio Scarano, Andrea Sciacchitano
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Determination of flow velocities using fiber-optic temperature measurements Exp. Fluids (IF 2.4) Pub Date : 2024-02-04 David Rautenberg, Tom Renner, Thomas Trick, Jochen Kriegseis
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Comparison of force measurement techniques in a short duration hypersonic facility Exp. Fluids (IF 2.4) Pub Date : 2024-02-03 Andrew Hyslop, Luke J. Doherty, Matthew McGilvray
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Jetting bubbles observed by x-ray holography at a free-electron laser: internal structure and the effect of non-axisymmetric boundary conditions Exp. Fluids (IF 2.4) Pub Date : 2024-02-01 Juan M. Rosselló, Hannes P. Hoeppe, Max Koch, Christiane Lechner, Markus Osterhoff, Malte Vassholz, Johannes Hagemann, Johannes Möller, Markus Scholz, Ulrike Boesenberg, Jörg Hallmann, Chan Kim, Alexey Zozulya, Wei Lu, Roman Shayduk, Anders Madsen, Tim Salditt, Robert Mettin
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Global analysis of nonlinear second-mode development in a Mach-6 boundary layer from high-speed schlieren data Exp. Fluids (IF 2.4) Pub Date : 2024-01-31 Cole E. Sousa, Richard E. Kennedy, Rudolph A. King, Brett F. Bathel, Joshua M. Weisberger, Stuart J. Laurence
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Attenuation of the acoustic noise radiated by a compressible boundary layer through injection of a vibrationally active gas Exp. Fluids (IF 2.4) Pub Date : 2024-01-27
Abstract The effects of vibrational nonequilibrium processes on turbulence-generated acoustic noise were investigated in a Mach-2.8 shock-tunnel facility. Gas mixtures with relevant absorption characteristics were first identified from measurements of attenuation coefficients using a heated acoustic chamber. In the shock-tunnel facility, CO \(_2\) , N \(_2\) , He, and He/CO \(_2\) mixtures were injected
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Development of a novel technique for measuring the sloshing elevation along the circumference in cylindrical tanks Exp. Fluids (IF 2.4) Pub Date : 2024-01-27 U. Tamir, O. Katsir, O. V. Gendelman, E. Shimshi
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Large-scale free-piston-driven multi-mode shock expansion tunnel Exp. Fluids (IF 2.4) Pub Date : 2024-01-25 Samuel Stennett, David Gildfind, Andreas Andrianatos, Richard Morgan, Peter Jacobs, Christopher James, Pierpaolo Toniato, Wilson Chan, Todd Silvester
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Water tunnel testing of downwind yacht sails Exp. Fluids (IF 2.4) Pub Date : 2024-01-23 Jean-Baptiste R. G. Souppez, Ignazio Maria Viola
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cntTSP visualization technique for rotating blade surface flow at low Reynolds number Exp. Fluids (IF 2.4) Pub Date : 2024-01-18 Tsubasa Ikami, Ren Nishimura, Hiroki Nagai
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Dynamic behavior of detonation waves in millimeter-scale tubes: unraveling the influence of tube diameter, initial pressure, and mixture Exp. Fluids (IF 2.4) Pub Date : 2024-01-16 Zhenhua Pan, Nan Jiang, Jian Zhou, Penggang Zhang
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Experimental study on time-resolved 3D ice accretion shape measurements in large-scale icing wind tunnel Exp. Fluids (IF 2.4) Pub Date : 2024-01-11 Chenglin Zuo, Jun Ma, Longtao Wei, Senyun Liu, Xian Yi
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Estimation of 3D ship airwakes using dual-plane PIV Exp. Fluids (IF 2.4) Pub Date : 2023-12-24 Nicholas Zhu, Zheng Zhang, Ebenezer P. Gnanamanickam, J. Gordon Leishman
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Two-dimensional strain rate imaging study using a polarization camera and birefringent aqueous cellulose nanocrystal suspensions Exp. Fluids (IF 2.4) Pub Date : 2023-12-18 Connor Lane, Frédéric Baumann, David Rode, Thomas Rösgen