document

Polydispersity effect on dry and immersed granular collapses: an experimental study

Polanía, Oscar (author), Estrada, Nicolas (author), Azéma, Emilien (author), Renouf, Mathieu (author), Cabrera, M.A. (author)

The column collapse experiment is a simplified version of natural and industrial granular flows. In this set-up, a column built with grains collapses and spreads over a horizontal plane. Granular flows are often studied with a monodisperse distribution; however, this is not the case in natural granular flows where a variety of grain sizes, known...

journal article 2024

document

4D Neutron Imaging of Solute Transport and Fluid Flow in Sandstone Before and After Mineral Precipitation

Shafabakhsh, Paiman (author), Cordonnier, Benoît (author), Pluymakers, Anne (author), Le Borgne, Tanguy (author), Mathiesen, Joachim (author), Linga, Gaute (author), Hu, Yi (author), Kaestner, Anders (author), Renard, François (author)

In many geological systems, the porosity of rock or soil may evolve during mineral precipitation, a process that controls fluid transport properties. Here, we investigate the use of 4D neutron imaging to image flow and transport in Bentheim sandstone core samples before and after in-situ calcium carbonate precipitation. First, we demonstrate...

journal article 2024

document

Generalised Isentropic Relations in Thermodynamics

Nederstigt, P. (author), Pecnik, Rene (author)

Isentropic processes in thermodynamics are fundamental to our understanding of numerous physical phenomena across different scientific and engineering fields. They provide a theoretical reference case for the evaluation of real thermodynamic processes and observations. Yet, as analytical relations for isentropic transformations in gas dynamics...

journal article 2023

document

Portable and integrated microfluidic flow control system using off-the-shelf components towards organs-on-chip applications

Zhu, Haoyu (author), Özkayar, G. (author), Lötters, J.C. (author), Tichem, M. (author), Ghatkesar, M.K. (author)

Organ-on-a-chip (OoC) devices require the precise control of various media. This is mostly done using several fluid control components, which are much larger than the typical OoC device and connected through fluidic tubing, i.e., the fluidic system is not integrated, which inhibits the system’s portability. Here, we explore the limits of...

journal article 2023

document

Physics-based modelling and data-driven optimisation of a latent heat thermal energy storage system with corrugated fins

Tavakoli, Ali (author), Hashemi, Javad (author), Najafian, Mahyar (author), Ebrahimi, Amin (author)

Solid-liquid phase transformation of a phase change material in a rectangular enclosure with corrugated fins is studied. Employing a physics-based model, the influence of fin length, thickness, and wave amplitude on the thermal and fluid flow fields is explored. Incorporating fins into thermal energy storage systems enhances the heat transfer...

journal article 2023

document

Laser butt welding of thin stainless steel 316L sheets in asymmetric configurations: A numerical study

Ebrahimi, Amin (author), Hermans, M.J.M. (author)

Laser butt welding of thin metal sheets is a widely used fusion-based joining technique in industrial manufacturing. A comprehensive understanding of the complex transport phenomena during the welding process is essential for achieving high-quality welds. In the present work, high-fidelity numerical simulations are employed to investigate the...

journal article 2023

document

Design of Artificial Neural Network for predicting the reduction in permeability of porous media as a result of polymer gel injection

Kamel Targhi, Elahe (author), Emami Niri, Mohammad (author), Zitha, P.L.J. (author)

Cross-linked polymer gel is widely used in the oil and gas industry to block high permeability conduits and reduce water cut. The complex nature of this fluid, especially regarding flow in porous media, makes its numerical simulation very time-consuming. This study presents an approach to designing an Artificial Neural Network (ANN) model...

journal article 2023

document

Towards improved porous models for solid/fluid topology optimization

Theulings, M.J.B. (author), Langelaar, Matthijs (author), van Keulen, A. (author), Maas, Robert (author)

Modeling of fluid flows in density-based topology optimization forms a longstanding challenge. Methods based on the Navier–Stokes equations with Darcy penalization (NSDP equations) are widely used in fluid topology optimization. These methods use porous materials with low permeability to represent the solid domain. Consequently, they suffer...

journal article 2023

document

Role of turbulent kinetic energy modulation by particle–fluid interaction in sediment pick-up

Keetels, G.H. (author), Chauchat, Julien (author), Breugem, W.P. (author)

Reliable prediction of the erosion rate of sediment beds is important for many applications in coastal and river engineering. Theoretical understanding of empirically derived scaling relations is still lacking. This applies in particular for the scaling anomaly between low and high Shields number conditions. In this work, the erosion process is...

journal article 2023

document

Hybrid-dimensional modeling for fluid flow in heterogeneous porous media using dual fracture-pore model with flux interaction of fracture–cavity network

Wang, Luyu (author), Chen, Weizhong (author), Vuik, Cornelis (author)

Developing numerical method of fractured porous media is of paramount importance in geoscience applications. Previous studies have revealed that the discrete fractures and cavities as well as the heterogeneity have considerable influences on hydraulic property of porous media. This work presents a numerical investigation on fluid flow in...

journal article 2022

document

Approximate solutions to the optimal flow problem of multi-area integrated electrical and gas systems

Ananduta, W. (author), Grammatico, S. (author)

We formulate the optimal flow problem in a multi-area integrated electrical and gas system as a mixed-integer optimization problem by approximating the non-linear gas flows with piece-wise affine functions, thus resulting in a set of mixed-integer linear constraints. For its solution, we propose a novel algorithm that consists in one stage for...

conference paper 2022

document

Silicification, flow pathways, and deep-seated hypogene dissolution controlled by structural and stratigraphic variability in a carbonate-siliciclastic sequence (Brazil)

Pisani, Luca (author), Antonellini, Marco (author), Bezerra, Francisco H.R. (author), Carbone, Cristina (author), Auler, Augusto S. (author), Audra, Philippe (author), La Bruna, Vincenzo (author), Bertotti, G. (author), Balsamo, Fabrizio (author)

Fractured and karstified carbonate units are key exploration targets for the hydrocarbon industry as they represent important reservoirs. Furthermore, large water reserves and geothermal systems are hosted in carbonate aquifers. This paper documents the relationships between stratigraphy, structural patterns, silicification, and the spatial...

journal article 2022

document

Combined three-dimensional flow field measurements and motion tracking of freely moving spheres in a turbulent boundary layer

Van Hout, R. (author), Hershkovitz, A. (author), Elsinga, G.E. (author), Westerweel, J. (author)

A combination of time-resolved tomographic particle image velocimetry, refractive index matching technique and machine vision algorithms was used to measure the translational and rotational motion of freely moving, nearly neutrally buoyant spheres in a fully developed turbulent boundary layer (TBL). Located in the buffer and logarithmic...

journal article 2022

document

Long-time-scale transients in an industrial-scale slurry pipeline near the laminar–turbulent transition

Dash, A. (author), Poelma, C. (author)

We revisit the laminar–turbulent transition of a fine-grained slurry in a large pipe. The combination of long measurement times in an industrial-scale facility and ultrasound imaging allows us to observe and address anomalous trends. Under turbulent conditions, the flow is homogeneous and steady. However, under laminar conditions, two types of...

journal article 2022

document

Effect of hydrodynamic slip on the rotational dynamics of a thin Brownian platelet in shear flow

Kamal, Catherine (author), Gravelle, Simon (author), Botto, L. (author)

The classical theory by Jeffery predicts that, in the absence of Brownian fluctuations, a thin rigid platelet rotates continuously in a shear flow, performing periodic orbits. However, a stable orientation is possible if the surface of the platelet displays a hydrodynamic slip length comparable to or larger than the thickness of the platelet....

journal article 2021

document

Natural Fracture Network Characterisation: Numerical modelling, outcrop analysis and subsurface data

Boersma, Q.D. (author)

Responsibly using the subsurface for geo-energy extraction or storage requires an accurate understanding of the static and dynamic behaviour of the targeted reservoirs. While mostly dependent on intrinsic rock properties (e.g. porosity and permeability), this behaviour is also believed to be significantly impacted by the presence of natural...

doctoral thesis 2020

document

Particle-laden Taylor-Couette flows: Higher-order transitions and evidence for azimuthally localized wavy vortices

Dash, A. (author), Anantharaman, Arjun (author), Poelma, C. (author)

We extend upon the known flow transitions in neutrally buoyant particle-laden Taylor-Couette flows by accessing higher suspension Reynolds numbers in a geometry with radius ratio and aspect ratio. Flow transitions for several particle volume fractions () are investigated by means of flow visualization experiments, in a flow driven by a...

journal article 2020

document

Computational and Experimental Investigation of Biofilm Disruption Dynamics Induced by High-Velocity Gas Jet Impingement

Prades, Lledó (author), Fabbri, Stefania (author), Dorado, Antonio D. (author), Gamisans, Xavier (author), Stoodley, Paul (author), Picioreanu, C. (author)

Experimental data showed that high-speed microsprays can effectively disrupt biofilms on their support substratum, producing a variety of dynamic reactions such as elongation, displacement, ripple formation, and fluidization. However, the mechanics underlying the impact of high-speed turbulent flows on biofilm structure is complex under such...

journal article 2020

document

Numerical analysis of natural convection with conjugate heat transfer in coarse-grained porous media

Chakkingal, M. (author), Kenjeres, S. (author), Ataei Dadavi, I. (author), Tummers, M.J. (author), Kleijn, C.R. (author)

We report numerical simulations of fluid natural convection with conjugate heat transfer in a bottom-heated, top-cooled cubical cavity packed with relatively large (d/L=0.2) solid spheres in a Body Centred Tetragonal (BCT) configuration. We study largely varying solid-to-fluid thermal conductivity ratios between 0.3 and 198, for a fluid...

journal article 2019

document

Formation and break-up of rigid agglomerates in turbulent channel and pipe flows

Schutte, K.C.J. (author), Portela, L. (author), Twerda, A. (author), Henkes, R.A.W.M. (author)

We have developed and applied an Eulerian-Lagrangian model for the transport, formation, break-up, deposition and re-entrainment of particle agglomerates. In this paper, we focus on agglomeration and break-up. Simulations were carried out to investigate what changes in the turbulent flow are inflicted by the presence of the agglomerates. Also...

journal article 2018