Searched for: department%3A%22Process%255C+and%255C+Energy%22
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Van Wijk, A.J.M. (author), Van Wijk, I. (author)
Additive manufacturing or 3D printing, manufacturing a product layer by layer, offers large design freedom and faster product development cycles, as well as low startup cost of production, on-demand production and local production. In principle, any product could be made by additive manufacturing. Even food and living organic cells can be...
book 2015
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Vlugt, T.J.H. (author), Van der Eerden, J.P.J.M. (author), Dijkstra, M. (author), Smit, B. (author), Frenkel, D. (author)
Statistical Thermodynamics and Molecular Simulation aim at describing the properties of systems that consist of many individual particles (atoms, molecules). Although the properties of the complete system follow directly from the properties and interactions of the individual particles, usually these properties cannot be calculated directly by...
book 2009
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Patel, A. (author), Pecnik, Rene (author), Peeters, J.W.R. (author), Boersma, B.J. (author), Hickel, S. (author), Moghadam, M.E. (author)
We investigate the effectiveness of the semi-local Reynolds number Re τ to parametrize wall-bounded flows with strong density, ρ, and viscosity, µ, gradients. Several cases are considered, namely, volumetrically heated low-Mach-number turbulent channel flows, a simultaneously heated and cooled flow with CO2 at supercritical pressure, and heated and...
book chapter 2017
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Stoop, A.H. (author), Bakker, T.W. (author), Kramer, H.J.M. (author)
In several studies the beneficial influence of pre-treatment of waste activated sludge with cavitation on the biogas production was demonstrated. It is however, still not fully certain whether this effect should be mainly contributed to an increase in conversion rate of organics into biogas by anaerobic bacteria, and how much cavitation...
conference paper 2015
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Tokgoz, S. (author), Elsinga, G.E. (author), Westerweel, J. (author)
Time-resolved tomographic PIV was used to investigate the time evolution of turbulent flow structures in Taylor-Couette flow. Turbulence is created by the shear due to exact counter rotation of the cylinders, where the mean velocity is zero in the bulk flow. This enables to observe the structures longer than many other turbulent flow types,...
conference paper 2013
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Eisma, J. (author), Westerweel, J. (author), Elsinga, G.E. (author)
Experimental research is presented on the characteristics of interfaces and internal layers that are present in a turbulent boundary layer (TBL). Both the turbulent non-turbulent interface (T/NT) and internal shear layers are detected in snapshots of the stereo-PIV data. It turns out that the internal layers exhibit similar characteristics...
conference paper 2015
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Van Eckeveld, A.C. (author), Pancham, A.K. (author), Westerweel, J. (author), Poelma, C. (author)
Experiments have been carried out to investigate the effect of liquid cavity filling on the behavior of the gas flow over a flat plate cavity. PIV measurements in the gas phase reveal that cavity filling can affect vortex shedding in the cavity mouth. Shear layer vortices can break-up into smaller vortices, thereby losing their periodic...
conference paper 2015
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Koschatzky, V. (author), Westerweel, J. (author), Boersma, B.J. (author)
The aim of the present study is to compare two different acoustic analogies applied to time-resolved particle image velocimetry (PIV) data for the prediction of the acoustic far-field generated by the flow over a rectangular cavity. Recent developments in laser and camera technology allow the possibility to extend PIV to the study of...
conference paper 2010
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Lashgari, I. (author), Picano, F. (author), Breugem, W.P. (author), Brandt, L. (author)
Inertial regimes in a channel flow of suspension of finite-size neutrally buoyant particles are studied for a wide range of Reynolds numbers: 500 Re 5000, and particle volume fractions: 0 0:3. The flow is classified in three different regimes according to the phase-averaged stress budget across the channel [2]. The laminar viscous regime at low...
conference paper 2015
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Greidanus, A. (author), Delfos, R. (author), Tokgoz, S. (author), Westerweel, J. (author)
Friction measurements were performed in a Taylor-Couette setup. Drag reduction was obtained with a riblet surface and indicated a drag reduction for a wide range of shear Reynolds numbers, with a maximum of 5.3% at Re_s=47000 (s+=14). Tomographic PIV verified that the friction coefficients are strongly related to the flow regimes and structures....
conference paper 2015
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Fiscaletti, D. (author), Elsinga, G.E. (author), Ganapathisubramani, B. (author), Westerweel, J. (author)
This work involves the large-scale amplitude and frequency modulation of the small-scale motions in fullydeveloped turbulence of a high Reynolds number jet. The scales responsible for the production of turbulent kinetic energy (large scales), and those responsible for its viscous dissipation (small scales) are extracted from time series of...
conference paper 2013
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Fiscaletti, D. (author), Attili, A. (author), Bisetti, F. (author), Elsinga, G.E. (author)
The interaction between scales is investigated in a turbulent mixing layer. The large-scale amplitude modulation of the small scales already observed in other works depends on the crosswise location. Large-scale positive fluctuations correlate with a stronger activity of the small scales on the low speed-side of the mixing layer, and a reduced...
conference paper 2015
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Poelma, C. (author), Franken, M.J.Z. (author), Kim, H. (author), Westerweel, J. (author)
Contact lines are the locations where a gas, liquid and a solid meet. From everyday experience we know that such contact lines can be mobile, for example in the case of a water droplet sliding over a glass surface. However, the continuum description of the flow towards or away from a contact line implies that the forces diverge as one approaches...
conference paper 2014
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Picano, F. (author), Costa, P. (author), Breugem, W.P. (author), Brandt, L. (author)
Dense suspensions are usually investigated in the laminar limit where inertial effects are insignificant. When the flow rate is high enough, i.e. at high Reynolds number, the flow may become turbulent and the interaction between solid and liquid phases modifies the turbulence we know in single-phase fluids. In the present work, we study...
conference paper 2015
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Ma, L. (author), Naud, B. (author), Roekaerts, D.J.E.M. (author)
MILD Combustion, also known as flameless combustion, is attracting wide scientific interest due to its potential of high efficiency and low NOx emission. This paper focuses on the numerical modeling of one of the ethanol spray flame cases from the Delft Spray-in-Hot-Coflow (DSHC) burner, which has been used to study MILD oxidation of liquid...
conference paper 2014
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Breugem, W.P. (author), Simões Costa, P. (author)
conference paper 2013
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Greidanus, A.J. (author), Delfos, R. (author), Tokgoez, S. (author), Westerweel, J. (author)
Low drag surfaces are often desired in many industries with applications in open and closed channel flows, such as ship hulls and pipe flows. Drag reduction is a phenomenon that can have substantial energy savings, resulting in ecological and economical benefits. We use a Taylor-Couette facility as experimental instrument to measure the drag...
conference paper 2015
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Gul, M. (author), Elsinga, G.E. (author), Westerweel, J. (author)
This study investigates the effect of the Taylor-Couette geometry, namely the aspect ratio, ?, and the gap width ratio, ?, on the torque hysteresis reported by [1]. Measurements were taken at two shear Reynolds numbers, Re s, of 5.5x10? and 9x10?.The torque was recorded while decreasing or increasing the rotation frequency ratio a=-fo/fi,...
conference paper 2015
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Trinh, T.T. (author), Vlugt, T.J.H. (author), Hägg, M.B. (author), Bedeaux, D. (author), Kjelstrup, S.H. (author)
We performed classical molecular dynamics (MD) simulation to understand the mechanism of CO2 adsorption and transport on graphite surface. The temperature of the system in our simulation was in the range 300-500K. The simulation data show that there are two layers of CO2 molecules absorbed on the surface. These two layers have a different...
conference paper 2013
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Goudar, M.V. (author), Elsinga, G.E. (author)
Pair dispersion is studied to model scalar transport in many natural and industrial applications. The link between the particle pair dispersion and coherent flow structures is explored in this work. This was done by kinematically simulating tracer particles in an ideal flow structure [4] extracted from an isotropic turbulent flow. It was found...
conference paper 2015
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