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Ebrahimi, Amin (author), Sattari, Mohammad (author), Babu, A. (author), Sood, A. (author), Römer, Gert Willem R.B.E. (author), Hermans, M.J.M. (author)Laser beam shaping offers remarkable possibilities to control and optimise process stability and tailor material properties and structure in laser-based welding and additive manufacturing. However, little is known about the influence of laser beam shaping on the complex melt-pool behaviour, solidified melt-track bead profile and...journal article 2023
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Jiang, Chuanning (author), An, Xizhong (author), Li, Meng (author), Wu, Yuhang (author), Gou, Dazhao (author), Wu, Yongli (author)Mixing structures and characteristics are crucial to the mixing quality of spherical/cylindrical binary granular systems like the biomass-coal mixtures which can affect energy release and carbon emissions. In this work, the mixing of binary spheres/cylinders in a rotating drum was numerically reproduced by using discrete element method (DEM)....journal article 2023
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Yang, Yueming (author), Wang, Xurong (author), Hooman, K. (author), Han, Kuihua (author), Xu, Jinliang (author), He, Suoying (author), Qi, Jianhui (author)Recently, the supercritical carbon dioxide (SCO<sub>2</sub>) power cycle has become a hotspot in the field of energy-efficient utilization. The utilization of additives in the power cycle has been proven to be an effective way to improve the SCO<sub>2</sub> power cycle efficiency. As one of the core components of the system, the influence of...journal article 2023
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Tosto, F. (author), Wheeler, Andrew (author), Pini, M. (author)In this work, we investigate the sources of dissipation in adiabatic boundary layers of non-ideal compressible fluid flows. Direct numerical simulations of transitional, zero-pressure gradient boundary layers are performed with an in-house solver considering two fluids characterized by different complexity of the fluid molecules, namely air...book chapter 2023
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Hunziker, J. (author), Slob, E.C. (author), Irving, J. (author)Modeling ground penetrating radar (GPR) reflection data on glaciers with methods that require the discretization of the full subsurface domain is extremely computationally expensive because of the combination of a large domain size and the comparatively short wavelength of the signal. To address this issue, we build on and extend a previously...journal article 2023
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Pineda Quijano, D.F. (author), Infante Ferreira, C.A. (author), Brück, E.H. (author)The development of affordable magnetocaloric materials (MCM) with a giant magnetocaloric effect (MCE) has brought magnetocaloric heat pumps a step closer to commercialization. The narrow temperature range in which these materials exhibit a large MCE demands the use of several materials with Curie temperatures covering the temperature span of...journal article 2023
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Sturm, G.S.J. (author), van der Wurff, A. (author), Linnenbank, S. (author), Bonnet, J. (author), Koppert, A. (author)Thermal pathogen suppression in glasshouse horticulture by treatment with steam generated through combustion of fossil fuel will become progressively less desirable. Radio wave treatment could be an alternative. It has several advantages, the most notable is that it generates heat where it is needed in soil, so that it avoids heat losses and...journal article 2023
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Liu, S. (author), Zhou, Yangxiao (author), Zang, Yining (author), McClain, M.E. (author), Wang, Xu sheng (author)The Yongding River (Beijing, China) was dry most times of the year, and groundwater storage was severely depleted. To address this issue, a river rehabilitation project was initiated. A downstream environmental flow release (EFR) project from upstream reservoirs has been implemented since 2019. This study evaluated the impact of EFR by...journal article 2023
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Nazari, Farzaneh (author), Aghabozorgi Nafchi, Shokoufeh (author), Vahabzadeh Asbaghi, Ehsan (author), Farajzadeh, R. (author), Niasar, Vahid J. (author)Hypothesis: Underground hydrogen storage in depleted hydrocarbon reservoirs and aquifers has been proposed as a potential long-term solution to storing intermittently produced renewable electricity, as the subsurface formations provide secure and large storage space. Various phenomena can lead to hydrogen loss in subsurface systems with the...journal article 2023
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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
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Molahalli, Pranav (author)Due to the global energy crisis, there is a growing need to make industrial processes more efficient and clean. One such method is to use effective and renewable working fluids in power and refrigeration cycles. Research in this field during the past decade has placed supercritical CO2 (SCO2) in the forefront due to its non-ideal properties and...master thesis 2022
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van Gameren, Mels (author)To mitigate the effects of climate change, CO2-emmissions will have to be reduced. This can be done by substituting the use of fossil, CO2-heavy by the use of renewable, CO2-neutral energy carriers. Hydrogen is such a renewable energy carrier that can be produced in a CO2-neutral way. The potential of hydrogen is recognized by the European...master thesis 2022
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Franx, Marius (author)The ramifications of plastic pollution on the environment are becoming increasingly serious in various forms throughout the world. In this context, rivers are the most important suppliers of plastics entering the marine environment. However, rivers that contain high loads of plastic waste also directly harm the livelihoods of people living near...master thesis 2022
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Gaffarel, Jérémie (author)The Mars Ascent Vehicle will bring samples back from the surface of Mars to its low orbit in 2031. Its preliminary design has been performed by NASA, defining it as a two-stage solid propellant rocket. However, a research gap exists in finding what the optimum solid rocket motors geometries are to bring the Martian samples to a target orbit...master thesis 2022
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VOULTSOS, IOANNIS (author)The energy transition towards carbon neutrality requires a rapid electrification of all energy sectors by 2050. In the EU-27, the REPowerEU strategy, initiated in March 2022, is pursuing this target even more ambitiously. However, in order to achieve the aforementioned goals, the increasing demand for green hydrogen will...master thesis 2022
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Ebrahimi, Amin (author), Sattari, Mohammad (author), Bremer, Scholte J.L. (author), Luckabauer, Martin (author), Römer, Gert-willem R.B.E. (author), Richardson, I.M. (author), Kleijn, C.R. (author), Hermans, M.J.M. (author)The absorptivity of a material is a major uncertainty in numerical simulations of laser welding and additive manufacturing, and its value is often calibrated through trial-and-error exercises. This adversely affects the capability of numerical simulations when predicting the process behaviour and can eventually hinder the exploitation of fully...journal article 2022
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Liu, S. (author), Sinke, J. (author), Dransfeld, C.A. (author)Hot-pressing can be an attractive fabrication method that enables the forming of hybrid materials like thermoset based fibre metal laminates. However, the process simulation on press forming requires accurate material characterization and boundary conditions to facilitate part design for a defect-free component. In order to improve the overall...conference paper 2022
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Wang, Y. (author), Voskov, D.V. (author)Simulation of heat production in high-enthalpy geothermal systems is associated with a complex physical process in which cold water invades steam-saturated control volumes. The fully implicit, fully coupled numerical strategy is commonly adopted to solve the governing system composed of mass and energy conservation equations. A conventional...journal article 2022
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Shahzad, H. (author), Hickel, S. (author), Modesti, D. (author)We perform direct numerical simulations of turbulent flow at friction Reynolds number Re<sub>τ</sub>≈ 500 - 2000 grazing over perforates plates with moderate viscous-scaled orifice diameter d<sup>+</sup>≈ 40 - 160 and analyse the relation between permeability and added drag. Unlike previous studies of turbulent flows over permeable surfaces,...journal article 2022
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Peng, Shaoyuan (author), Liu, Y. (author), Li, Renge (author), Wei, Ying (author), Chan, Pak Wai (author), Li, Sunwei (author)Simulating a typhoon’s wind field via mesoscale models is important in terms of providing not only the guidelines for urban planning and onshore/offshore constructions, but also the provision of insight into the dynamics and thermodynamics of tropical cyclone systems. Therefore, the errors that are contained in simulation results were...journal article 2022