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Magnetically-induced Rayleigh Taylor instability under rotation: comparison of experimental and theoretical results (2020)
Journal Article
Scase, M., Baldwin, K., & Hill, R. (in press). Magnetically-induced Rayleigh Taylor instability under rotation: comparison of experimental and theoretical results. Physical Review E,

Our theoretical work has shown that rotating a Rayleigh-Taylor-unstable two-layer stratification about a vertical axis slows the development of the instability under gravity, and can stabilise axisymmetric modes indefinitely. Here, we compare theoret... Read More about Magnetically-induced Rayleigh Taylor instability under rotation: comparison of experimental and theoretical results.

Analog cosmology with two-fluid systems in a strong gradient magnetic field (2019)
Journal Article
Fifer, Z., Torres, T., Erne, S., Avgoustidis, A., Hill, R. J. A., & Weinfurtner, S. (2019). Analog cosmology with two-fluid systems in a strong gradient magnetic field. Physical Review E, 99(3), doi:10.1103/physreve.99.031101

We propose an experiment combining fluid dynamics and strong magnetic field physics to simulate cosmological scenarios. Our proposed system consists of two immiscible, weakly magnetized fluids moved through a strong gradient magnetic field. The diama... Read More about Analog cosmology with two-fluid systems in a strong gradient magnetic field.

Centrifugally forced Rayleigh-Taylor instability (2018)
Journal Article
Scase, M. M., & Hill, R. J. (2018). Centrifugally forced Rayleigh-Taylor instability. Journal of Fluid Mechanics, 852, 543-577

We consider the effect of high rotation rates on two liquid layers that initially form concentric cylinders, centred on the axis of rotation. The configuration may be thought of as a fluid-fluid centrifuge. There are two types of perturbation to the... Read More about Centrifugally forced Rayleigh-Taylor instability.

Magnetic Levitation Stabilized by Streaming Fluid Flows (2018)
Journal Article
Fairhurst, D., Swift, M., Hill, R., Atkinson, P., Baldwin, K., Baldwin, K., …Fairhurst, D. (2018). Magnetic Levitation Stabilized by Streaming Fluid Flows. Physical Review Letters, 121(6), 1-5. doi:10.1103/physrevlett.121.064502

We demonstrate that the ubiquitous laboratory magnetic stirrer provides a simple passive method of magnetic levitation, in which the so-called ‘flea’ levitates indefinitely. We study the onset of levitation and quantify the flea’s motion (a combinati... Read More about Magnetic Levitation Stabilized by Streaming Fluid Flows.

Shapes and fissility of highly charged and rapidly rotating levitated liquid drops (2017)
Journal Article
Liao, L., & Hill, R. J. (2017). Shapes and fissility of highly charged and rapidly rotating levitated liquid drops. Physical Review Letters, 119, https://doi.org/10.1103/PhysRevLett.119.114501

We use diamagnetic levitation to investigate the shapes and the stability of free electrically charged and spinning liquid drops of volume ∼1 ml. In addition to binary fission and Taylor cone-jet fission modes observed at low and high charge density,... Read More about Shapes and fissility of highly charged and rapidly rotating levitated liquid drops.

Magnetically Induced Rotating Rayleigh-Taylor Instability (2017)
Journal Article
Scase, M. M., Baldwin, K. A., & Hill, R. J. (2017). Magnetically Induced Rotating Rayleigh-Taylor Instability. Journal of Visualized Experiments, https://doi.org/10.3791/55088

Classical techniques for investigating the Rayleigh-Taylor instability include using compressed gasses, rocketry or linear electric motors to reverse the effective direction of gravity, and accelerate the lighter fluid toward the denser fluid. Other... Read More about Magnetically Induced Rotating Rayleigh-Taylor Instability.

Ice as a granular material (2016)
Conference Proceeding
Turnbull, B., & Swift, M. (2016). Ice as a granular material

Ice is a unique material, fundamental to vital processes on earth, in the atmosphere [1] and as planets and comets form [2]. In this work, we introduce two experiments investigating ice as a granular material, to provide snippets of insight into thos... Read More about Ice as a granular material.

Propulsion of a two-sphere swimmer (2015)
Journal Article
Klotsa, D., Baldwin, K. A., Hill, R. J., Bowley, R., & Swift, M. R. (2015). Propulsion of a two-sphere swimmer. Physical Review Letters, 115(24), doi:10.1103/PhysRevLett.115.248102

We describe experiments and simulations demonstrating the propulsion of a neutrally-buoyant swimmer that consists of a pair of spheres attached by a spring, immersed in a vibrating fluid. The vibration of the fluid induces relative motion of the sphe... Read More about Propulsion of a two-sphere swimmer.

The inhibition of the Rayleigh-Taylor instability by rotation (2015)
Journal Article
Baldwin, K. A., Scase, M. M., & Hill, R. J. (2015). The inhibition of the Rayleigh-Taylor instability by rotation. Scientific Reports, 5(11706), doi:10.1038/srep11706

It is well-established that the Coriolis force that acts on fluid in a rotating system can act to stabilise otherwise unstable flows. Chandrasekhar considered theoretically the effect of the Coriolis force on the Rayleigh-Taylor instability, which oc... Read More about The inhibition of the Rayleigh-Taylor instability by rotation.

Artificial tektites: an experimental technique for capturing the shapes of spinning drops (2015)
Journal Article
Baldwin, K. A., Butler, S. L., & Hill, R. J. (in press). Artificial tektites: an experimental technique for capturing the shapes of spinning drops. Scientific Reports, 5, https://doi.org/10.1038/srep07660

Determining the shapes of a rotating liquid droplet bound by surface tension is an archetypal problem in the study of the equilibrium shapes of a spinning and charged droplet, a problem that unites models of the stability of the atomic nucleus with t... Read More about Artificial tektites: an experimental technique for capturing the shapes of spinning drops.

Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals (2014)
Journal Article
Turyanska, L., Hill, R. J. A., Makarovsky, O., Moro, F., Knott, A. N., Larkin, O. J., …Curry, R. J. (2014). Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals. Nanoscale, 6(15), 8919-8925. https://doi.org/10.1039/c4nr02336f

We report on PbS colloidal nanocrystals that combine within one structure solubility in physiological solvents with near-infrared photoluminescence, and magnetic and optical properties tuneable by the controlled incorporation of magnetic impurities (... Read More about Tuneable paramagnetic susceptibility and exciton g-factor in Mn-doped PbS colloidal nanocrystals.

Mechanical vibrations of magnetically levitatedviscoelastic droplets (2014)
Journal Article
Temperton, R. H., Hill, R. J., & Sharp, J. S. (2014). Mechanical vibrations of magnetically levitatedviscoelastic droplets. Soft Matter, 10(29), 5375-5379. doi:10.1039/c4sm00982g

The mechanical vibrations of magnetically levitated droplets were investigated using a simple optical deflection technique. Droplets of water and a water-based solution of poly(acrylamide-co-acrylic acid) were levitated in the bore of a superconducti... Read More about Mechanical vibrations of magnetically levitatedviscoelastic droplets.


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