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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
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Turbulent junction flow characteristics upstream of boulders mounted atop a rough, permeable bed and the effects of submergence Exp. Fluids (IF 2.4) Pub Date : 2023-12-19 Micah A. Wyssmann, James G. Coder, John S. Schwartz, A. N. Thanos Papanicolaou
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Separated flow around half-submerged horizontal circular cylinders at different Reynolds numbers Exp. Fluids (IF 2.4) Pub Date : 2023-12-20 Samuel Addai, Mark F. Tachie, Karen Dow, Shawn P. Clark, Mark K. Israel
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Measurements of the local equivalence ratio and its impact on the thermochemical state in laminar partially premixed boundary layer flames Exp. Fluids (IF 2.4) Pub Date : 2023-12-17 M. Greifenstein, F. Zentgraf, P. Johe, B. Boehm, M. Steinhausen, C. Hasse, A. Dreizler
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Hydrodynamics and shape reconstruction of single rising air bubbles in water using high-speed tomographic particle tracking velocimetry and 3D geometric reconstruction Exp. Fluids (IF 2.4) Pub Date : 2023-12-14 Yingjie Chang, Conrad Müller, Péter Kováts, Liejin Guo, Katharina Zähringer
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Experimental studies of cavitation evolution through a butterfly valve at different regulation conditions Exp. Fluids (IF 2.4) Pub Date : 2023-12-12 Guang Zhang, Hao Tian Zhang, Ze Yong Wu, Xuan Wu, Heuy Dong Kim, Zhe Lin
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Automated large-scale and terrain-induced turbulence modulation of atmospheric surface layer flows in a large wind tunnel Exp. Fluids (IF 2.4) Pub Date : 2023-12-12 Nasreldin O. Mokhtar, Pedro L. Fernández-Cabán, Ryan A. Catarelli
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Towards time-resolved multi-property measurements by filtered Rayleigh scattering: diagnostic approach and verification Exp. Fluids (IF 2.4) Pub Date : 2023-12-11 Ulrich Doll, Ralf Kapulla, Michael Dues, Jonas Steinbock, Sergey Melnikov, Ingo Röhle, Matteo Migliorini, Pavlos K. Zachos
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Quantifying numerical uncertainty in background-oriented schlieren Exp. Fluids (IF 2.4) Pub Date : 2023-12-11 Pranjal Anand, Jiacheng Zhang, Lalit K. Rajendran, Sally P. M. Bane, Pavlos P. Vlachos
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Imaging of flame propagation and temperature distribution in an all-metal gasoline engine with endoscopic access via anisole fluorescence Exp. Fluids (IF 2.4) Pub Date : 2023-12-07 Muhammad Ali Shahbaz, Saad Jahangir, Sebastian A. Kaiser
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An experimental study on near-field tip vortex of an elliptical hydrofoil using tomographic particle image velocimetry Exp. Fluids (IF 2.4) Pub Date : 2023-12-05 Hang Zhao, Han Tu, Wenxuan She, Qi Gao, Yantao Cao, Xiaoxing Peng, Xueming Shao
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Non-invasive calibration for volumetric flow measurements in confined spaces Exp. Fluids (IF 2.4) Pub Date : 2023-11-28 Robert Hardege, Thomas Rockstroh, Katrin Bauer, Rüdiger Schwarze
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Experimental analysis of the 3D flow leading into an electrostatic precipitator Exp. Fluids (IF 2.4) Pub Date : 2023-11-28 Jeongmo Seong, Han June Park, Kyuho Han, Joungho Han, Wontae Hwang
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Gas density evolution and recirculation after a nanosecond pulsed discharge: experimental and computational results Exp. Fluids (IF 2.4) Pub Date : 2023-11-22 Steven Adams, Ciprian Dumitrache, Chase Murray
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Investigation of visible to near-infrared high-speed cameras for thermography in hypersonic testing Exp. Fluids (IF 2.4) Pub Date : 2023-11-17 Loïc G. Alemany, Christopher M. James, Timothy G. Cullen, Yu Liu
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Data-driven estimation of scalar quantities from planar velocity measurements by deep learning applied to temperature in thermal convection Exp. Fluids (IF 2.4) Pub Date : 2023-11-20 Philipp Teutsch, Theo Käufer, Patrick Mäder, Christian Cierpka
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Density measurement of supersonic airflow using decay characteristics of FLEET emission Exp. Fluids (IF 2.4) Pub Date : 2023-11-20 Wakako Yamaguchi, Yosuke Sugioka, Shunsuke Koike, Taro Handa
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Cycle-to-cycle variations in cross-flow turbine performance and flow fields Exp. Fluids (IF 2.4) Pub Date : 2023-11-16 Abigale Snortland, Isabel Scherl, Brian Polagye, Owen Williams
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Ex uno plures: how to construct high-speed movies of collapsing cavitation bubbles from a single image Exp. Fluids (IF 2.4) Pub Date : 2023-11-11 Armand Baptiste Sieber, Davide Bernardo Preso, Mohamed Farhat
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Studying macro- and mesoscopic wetting dynamics of a spreading oil droplet using multiple wavelength interferometry Exp. Fluids (IF 2.4) Pub Date : 2023-11-08 Timo Richter, Mathis Fricke, Peter Stephan, Cameron Tropea, Jeanette Hussong
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Homogeneous turbulence in a random-jet-stirred tank Exp. Fluids (IF 2.4) Pub Date : 2023-11-06 Joo Young Bang, Nimish Pujara
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Systematic error and correction of intensity-based I-PLIF for local pH and concentration measurements in unsteady boundary layers Exp. Fluids (IF 2.4) Pub Date : 2023-11-03 Tom Lacassagne, Mahmoud EL Hajem, Jean-Yves Champagne, Serge Simoëns