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Št. zadetkov: 6
Cavitation and jetting from shock wave refocusing near convex liquid surfaces
Hendrik Reese, Claus-Dieter Ohl, Juan Manuel Rosselló
Izvirni znanstveni članek
Oznake: udarni valovi;računalniška dinamika tekočin;kavitacija;shock waves;cavitation;computational fluid dynamics;
We study the physical mechanisms behind the ejection of a liquid jet from a curved free surface, specifically a free-falling water drop. The jet is produced after a spherical shock wave emitted from a micro-explosion created by a focused laser pulse is refocused on the opposite side of its source. T ...
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
High-speed ultrasound imaging of bubbly flows and shear waves in soft matter
Juan Manuel Rosselló, Saber Izak Ghasemian, Claus-Dieter Ohl
Izvirni znanstveni članek
Oznake: ultrazvočno slikanje;brizganje mehurčkov;mehka snov;strižni valovi;ultrasound imaging;bubble jetting;soft matter;shear waves;
In this methods paper, we explore the capabilities of high-speed ultrasound imaging (USI) to study fast varying and complex multi-phase structures in liquids and soft materials. Specifically, we assess the advantages and the limitations of this imaging technique through three distinct experiments in ...
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
Finite amplitude wave propagation through bubbly fluids
Siew-Wan Ohl, Juan Manuel Rosselló, Daniel Fuster, Claus-Dieter Ohl
Izvirni znanstveni članek
Oznake: kavitacija;mehurčki;cavitation;bubbles;
The existence of only a few bubbles could drastically reduce the acoustic wave speed in a liquid. Wood’s equation models the linear sound speed, while the speed of an ideal shock waves is derived as a function of the pressure ratio across the shock. The common finite amplitude waves lie, however, in ...
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
Dynamics of a cavitation bubble confined in a thin liquid layer at null Kelvin impulse
Jure Zevnik, Julien Patfoort, Juan Manuel Rosselló, Claus-Dieter Ohl, Matevž Dular
Izvirni znanstveni članek
Oznake: cavitation;bubble dynamics;free surface;jets;radial spreading;
In this work, we experimentally and numerically investigate cavitation bubble dynamics in a thin liquid layer surrounded by gas. We focus on configurations featuring strongly confined bubbles at dimensionless bubble-free surface stand-off distances below unity. Additionally, we impose the condition ...
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
Jetting bubbles observed by x-ray holography at a free-electron laser
Juan Manuel Rosselló, Hannes Paul Hoeppe, Max Koch, Christiane Lechner, Markus Osterhoff, Malte Vassholz, Johannes Hagemann, Johannes Möller, Markus Scholz, Ulrike Boesenberg
Izvirni znanstveni članek
Oznake: rentgenska holografija;brizganje mehurčkov;simulacije OpenFOAM;x-ray holography;bubble jetting;OpenFOAM simulations;
In this work, we study the jetting dynamics of individual cavitation bubbles using x-ray holographic imaging and high-speed optical shadowgraphy. The bubbles are induced by a focused infrared laser pulse in water near the surface of a flat, circular glass plate, and later probed with ultrashort x-ra ...
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
ǂThe ǂcollapse of a sonoluminescent cavitation bubble imaged with X-ray free-electron laser pulses
Hannes Paul Hoeppe, Markus Osterhoff, Atiyeh Aghel Maleki, Juan Manuel Rosselló, Malte Vassholz, Johannes Hagemann, Thea Engler, Daniel Schwarz, Angel Rodriguez-Fernandez, Ulrike Boesenberg
Izvirni znanstveni članek
Oznake: sonoluminiscenca;x-žarki;mehurčki;sonoluminescence;x-rays;bubbles;
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
Št. zadetkov: 6
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