69 citations · 346 across the 21 of their papers we have counts for
22 papers
Influence of the Inhalation Route on Tracheal Flow Structures in Patient-Specific Airways using 3D PTV
Benedikt H. Johanning-Meiners, Luca Mayolle, Dominik Krug +1
The tracheal flow field shapes particle transport into the lower airways and thus influences both the spread of inhaled pathogens and the effectiveness of aerosol-based therapies.…
Rising and settling 2D cylinders with centre-of-mass offset
Martin P. A. Assen, Jelle B. Will, Chong Shen Ng +3
Rotational effects are commonly neglected when considering the dynamics of freely rising or settling isotropic particles. Here, we demonstrate that particle rotations play an impor…
Diffusive and convective dissolution of carbon dioxide in a vertical cylindrical cell
Daniël P. Faasen, Farzan Sepahi, Dominik Krug +4
The dissolution and subsequent mass transfer of carbon dioxide gas into liquid barriers plays a vital role in many environmental and industrial applications. In this work, we study…
In-situ measurements of void fractions and bubble size distributions in bubble curtains
Simon Beelen, Martijn van Rijsbergen, Miloš Birvalski +2
We report the development of a novel measurement system designed to measure bubble properties in bubble curtains (i.e. planar bubble plumes) in-situ alongside acoustical measuremen…
Bubble-particle collisions in turbulence: insights from point-particle simulations
Timothy T. K. Chan, Chong Shen Ng, Dominik Krug
Bubble-particle collisions in turbulence are central to a variety of processes such as froth flotation. Despite their importance, details of the collision process have not received…
The effect of buoyancy driven convection on the growth and dissolution of bubbles on electrodes
Farzan Sepahi, Nakul Pande, Kai Leong Chong +5
Enhancing the efficiency of water electrolysis, which can be severely impacted by the nucleation and growth of bubbles, is key in the energy transition. In this combined experiment…
Dynamics of freely rising spheres: the effect of moment of inertia
Jelle B. Will, Dominik Krug
The goal of this study is to elucidate the effect the particle moment of inertia (MOI) has on the dynamics of spherical particles rising in a quiescent and turbulent fluid. To this…
Crossover of the relative heat transport contributions of plume ejecting and impacting zones in turbulent Rayleigh-Bénard convection
Philipp Reiter, Olga Shishkina, Detlef Lohse +1
Turbulent thermal convection is characterized by the formation of large-scale structures and strong spatial inhomogeneity. This work addresses the relative heat transport contribut…
Electroconvective instability in water electrolysis: an evaluation of electroconvective patterns and their onset features
Nakul Pande, Jeffery A. Wood, Guido Mul +3
In electrochemical systems, an understanding of the underlying transport processes is required to aid in their better design. This includes knowledge of possible near-electrode con…
Rising and Sinking in Resonance: Probing the critical role of rotational dynamics for buoyancy driven spheres
Jelle Will, Dominik Krug
We present experimental results for spherical particles rising and settling in a still fluid. Imposing a well-controlled center of mass offset enables us to vary the rotational dyn…
Fabrication of free-standing Pt nanowires for use as thermal anemometry probes in turbulence measurements
Hai Le-The, Christian Küchler, Albert van den Berg +3
We report a robust fabrication method for patterning free-standing Pt nanowires for the use as thermal anemometry probes for small-scale turbulence measurements. Using e-beam litho…
The large-scale footprint in small-scale Rayleigh-Bénard turbulence
Pieter Berghout, Woutijn Johannes Baars, Dominik Krug
Turbulent convection systems are known to give rise to prominent large scale circulation. At the same time, the `background' (or `small-scale') turbulence is also highly relevant a…
Kinematics and dynamics of freely rising spheroids at high Reynolds numbers
J. B. Will, V. Mathai, S. G. Huisman +3
We experimentally investigate the effect of geometrical anisotropy for buoyant ellipsoidal particles rising in a still fluid. All other parameters, such as the Galileo number $Ga \…
Flow organization in laterally unconfined Rayleigh-Bénard turbulence
Alexander Blass, Roberto Verzicco, Detlef Lohse +2
We investigate the large-scale circulation (LSC) of turbulent Rayleigh-Bénard convection in a large box of aspect ratio for Rayleigh numbers up to and at a fixed P…
Electrochemically Induced pH Change: Time-Resolved Confocal Fluorescence Microscopy Measurements and Comparison with Numerical Model
Nakul Pande, Shri K. Chandrasekar, Detlef Lohse +4
Confocal fluorescence microscopy is a proven technique, which can image near-electrode pH changes. For a complete understanding of electrode processes, time-resolved measurements a…
Connecting the time evolution of the turbulence interface to coherent structures
M. M. Neamtu-Halic, D. Krug, J. P. Mollicone +3
The surface area of turbulent/non-turbulent interfaces (TNTIs) is continuously produced and destroyed via stretching and curvature/propagation effects. Here, the mechanisms respons…
Coherence of temperature and velocity superstructures in turbulent Rayleigh-Bénard flow
Dominik Krug, Detlef Lohse, Richard J. A. M. Stevens
We investigate the interplay between large-scale patterns, so-called superstructures, in the fluctuation fields of temperature and vertical velocity in turbulent Rayleigh-B…
Lagrangian coherent structures and entrainment near the turbulent/non-turbulent interface of a gravity current
M. M. Neamtu-Halic, D. Krug, G. Haller +1
In this paper, we employ Lagrangian coherent structures (LCSs) theory for the three dimensional vortex eduction and investigate the effect of large-scale vortical structures on the…
Vertical Coherence of Turbulence in the Atmospheric Surface Layer: Connecting the Hypotheses of Townsend and Davenport
Dominik Krug, Woutijn J. Baars, Nicholas Hutchins +1
Statistical descriptions of coherent flow motions in the atmospheric boundary layer have many applications in the wind engineering community. For instance, the dynamical characteri…
Transition to ultimate Rayleigh-Bénard turbulence revealed through extended self similarity scaling analysis of the temperature structure functions
Dominik Krug, Xiaojue Zhu, Daniel Chung +3
In turbulent Rayleigh-Bénard (RB) convection, a transition to the so-called ultimate regime, in which the boundary layers (BL) are of turbulent type, has been postulated. Indeed, a…
Statistics of turbulence in the energy-containing range of Taylor-Couette compared to canonical wall-bounded flows
Dominik Krug, Xiang I. A. Yang, Charitha M. de Silva +4
Considering structure functions of the streamwise velocity component in a framework akin to the extended self-similarity hypothesis (ESS), de Silva \textit{et al.} (\textit{J. Flui…
On phoretic clustering of particles in turbulence
Lukas Schmidt, Itzhak Fouxon, Dominik Krug +2
We demonstrate that diffusiophoretic, thermophoretic and chemotactic phenomena in turbulence lead to clustering of particles on multi-fractal sets that can be described using one s…