30 citations · 101 across the 10 of their papers we have counts for
10 papers
On buoyancy in disperse two-phase flow and its impact on the well-posedness of two-fluid models
Rui Zhu, Yulan Chen, Katharina Tholen +2
The Maxey--Riley--Gatignol equation for the flow around a sphere at low particle Reynolds number tells us that the fluid-particle interaction force decomposes into a contribution f…
Coevolving aerodynamic and impact ripples on Earth
Hezi Yizhaq, Katharina Tholen, Lior Saban +11
Windblown sand creates multiscale bedforms on Earth, Mars, and other planetary bodies. According to conventional wisdom, decameter-scale dunes and decimeter-scale ripples emerge vi…
Addressing bedload flux variability due to grain shape effects and experimental channel geometry
Thomas Pähtz, Yulan Chen, Jiafeng Xie +8
The study-to-study variability of bedload flux measurements in turbulent sediment transport borders an order of magnitude, even for idealized laboratory conditions. This uncertaint…
Coarse-graining particulate two-phase flow
Thomas Pähtz, Yulan Chen, Rui Zhu +2
To acquire the ability to numerically study the rheology of particulate two-phase flows that lack scale separation, we present a general method to average or coarse-grain the equat…
Anomalous Scaling of Aeolian Sand Transport Reveals Coupling to Bed Rheology
Katharina Tholen, Thomas Pähtz, Sandesh Kamath +2
Predicting transport rates of windblown sand is a central problem in aeolian research, with implications for climate, environmental, and planetary sciences. Though studied since th…
Megaripple mechanics: bimodal transport ingrained in bimodal sands
Katharina Tholen, Thomas Pähtz, Hezi Yizhaq +2
Aeolian sand transport is a major process shaping landscapes on Earth and on diverse celestial bodies. Conditions favoring bimodal sand transport, with fine-grain saltation driving…
Single-dopant band bending fluctuations in MoSe measured with electrostatic force microscopy
Megan Cowie, Rikke Plougmann, Zeno Schumacher +1
In this work, we experimentally demonstrate two-state fluctuations in a metal-insulator-semiconductor (MIS) device formed out of a metallic atomic force microscopy tip, vacuum gap,…
Aeolian sand transport: Scaling of mean saltation length and height and implications for mass flux scaling
Thomas Pähtz, Katharina Tholen
Wind tunnel measurements of the mean saltation length and of different proxies of the mean saltation height in saturated aeolian sand transport indicate that and ar…
Unified model of sediment transport threshold and rate across weak and intense subaqueous bedload, windblown sand, and windblown snow
Thomas Pähtz, Yonghui Liu, Yuezhang Xia +3
Nonsuspended sediment transport (NST) refers to the sediment transport regime in which the flow turbulence is unable to support the weight of transported grains. It occurs in fluvi…
Effect of grafting on the binding transition of two flexible polymers
Johannes Zierenberg, Katharina Tholen, Wolfhard Janke
We investigate the binding transition of two flexible polymers grafted to a steric surface with closeby end points. While free polymers show a discontinuous transition, grafting to…