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NWO M grant for Sander Huisman and Claas Willem Visser — Turbulence with custom-made fibers
Particles in turbulent flows are everywhere in nature and industry, from algae in the ocean to paper making processes. Not much is knows about these flows, since the particles have complex shapes whereas research has focused on spheres in turbulence. We will investigate turbulence with complex-shaped particles with new experimental techniques for particle fabrication and flow measurement. This is particularly interesting since emerging research shows that such particles can reduce flow resistance. Therefore, we may discover new routes for optimization of industrial processes and better understanding and control of flows in nature.
Turning nanodroplets into microbubbles
University of Twente researchers have developed an ultrasound-based method to turn nano-sized liquid droplets into gas-filled microbubbles. The technology can have important implications for therapeutic drug delivery and the treatment of tumors. At the University of Twente, the magic often happens at a small scale. This is very true for the research of Guillaume Lajoinie and his colleagues. Lajoinie, assistant professor at the Faculty of Science and Technology, Physics of Fluids, together with assistant professor Tim Segers and Professor Michel Versluis, designed a small chip-like device, shaped like a rectangle, to study the vaporization process of liquid droplets. The device, measuring about one by two centimeters, with two wires attached to one end, turns liquid droplets into gas-filled microbubbles.
ERC starting grant for Sander Huisman - Melting dynamics in turbulent flows
Predicting the melting process of an iceberg or glacier, is often not even close to the actual physics, the difference can be a factor 100. Modelling dynamics is also complex in chemical processes in which several boundary layers play a role. The ‘multiscale’ nature – from micrometers to kilometers – of processes, in a turbulent environment and with interaction at the boundary layers, makes it very complex. With fundamental fluid dynamics as a starting point, Sander Huisman wants to reach a better understanding.
Meest succesvolle UT'er op social media - Associate Professor Dr Richard Stevens
Richard Stevens was de meest succesvolle UT'er op social media. Zijn berichten op Twitter genereerden de meeste interactie.
Dertien grensoverschrijdende verkennende samenwerkingsprojecten aan de slag met ElektroChemische Conversie en Materialen
Towards upscaling alkaline electrolysis: Pushing the limits of interfacial transport Prof. dr. D. Lohse, R.G.H. Lammertink, dr. D.J. Krug, M. Odijk, A. van den Berg, dr. J.A. Wood (UT), Helmholtz Zentrum Dresden Rossendorf (DE), Nobian, TU Dresden (DE) Waterstof (H2), geproduceerd met hernieuwbare elektriciteit, kan een integraal onderdeel zijn van onze energiestrategie. Met de huidige technologie kan dit proces echter niet economisch worden uitgevoerd. Dit onderzoeksprogramma zal fundamentele inzichten uit chemie, stromingsleer en engineering combineren om meer efficiënte en opgeschaalde technologieën te ontwikkelen voor waterstofproductie door alkaline elektrolyse door beter begrip van grensvlaktransportlimitaties.
Winning Video Contest APS-DFD “Gallery of fluid motion”
The gallery of fluid motion is an international annual contest in which videos and images compete for the aesthetic and science of contemporary fluid mechanics, and it is given during the American Physics Society conference on Fluid Dynamics. Our winning video entry is called “The Yarning Droplet” by Carola Seyfert (PhD) and Alvaro Marin (Assoc. Prof.). Music by Rodrigo Ezeta (PoF alumnus). This is the 3rd gallery of fluid motion winning entry for Alvaro Marin and the 11th for the Physics of Fluids cluster at the University of Twente.
Aurel Stodola medal awarded to Professor Detlef Lohse
The Aurel Stodola Lecture Series commemorates the personality and seminal contributions of Prof. Aurel Stodola in the early 20th century whose work on applied thermodynamics has guided many engineers and engineering developments worldwide. The Department of Mechanical and Process Engineering (D-MAVT) elected Prof. Dr. Detlef Lohse as the 2021 Laureate of the Aurel Stodola Lecture.
Microswimmers May Shepherd Large Liquid Volumes
Microswimmers can serve as cargo carriers that move deep inside complex flow networks. When a school collectively entrains the surrounding fluid, their transport capacity can be enhanced. This effect is quantified with good agreement between experiments with self-propelled droplets and a confined Brinkman squirmer model. The volume of liquid entrained can be much larger than the droplet itself, amplifying the effective cargo capacity over an order of magnitude, even for dilute schools. Hence, biological and engineered swimmers can efficiently transport materials into confined environments.
Windbreaks May Improve Wind Farm Power
Cost-effective ways to produce more renewable energy are critical in the fight against climate change. New simulations suggest that windbreaks—barriers, such as walls or rows of trees—can improve the power generation of wind farms by as much as 10% [1]. Previous work suggested that windbreaks can help individual wind turbines but that they are counterproductive for very large wind farms. The new work is the first simulation of a realistic wind farm with windbreaks. The researchers involved hope that their work will lead to improved efficiency in real wind farms.
Wind turbines unexpectedly more productive behind hill
If someone asked you to name the ideal place to build a wind turbine, chances are your first answer would not be “behind a hill”. Yet researchers from the University of Twente have discovered that in some cases wind turbines can actually produce more energy in that position than in a wide, open landscape. In an article published in the leading scientific journal Renewable Energy, Dr Luoqin Liu and Dr Richard Stevens (Faculty of Science and Technology) show in a series of simulations that wind turbines behind hills can generate up to 24% more energy.

The 10th Complex Motion in Fluids 2022
Max Planck Gesellschaft
Centre for Scientific Computing