Research Repository

See what's under the surface


Study of bubbles entrapped into a gas-sheared liquid film (2018)
Journal Article
Hann, D. B., Cherdantsev, A. V., & Azzopardi, B. J. (2018). Study of bubbles entrapped into a gas-sheared liquid film. International Journal of Multiphase Flow, 108, (181-201). doi:10.1016/j.ijmultiphaseflow.2018.07.001. ISSN 0301-9322

The surface of a thick liquid film under strong gas shear is covered by large-scale disturbance waves and small-scale ripples. Disruption of these ripples on top of disturbance waves by the gas stream leads to the creation of droplets that are entrai... Read More

Application of high speed filming techniques to the study of rearwards melt ejection in laser drilling (2017)
Journal Article
Jones, C., Hann, D. B., Voisey, K., & Aitken, S. (in press). Application of high speed filming techniques to the study of rearwards melt ejection in laser drilling. Journal of Laser Applications, 29(2), doi:10.2351/1.4983269. ISSN 1042-346X

Melt ejection is the dominant material removal mechanism in long, ms, pulse laser drilling of metals, a process with applications such as the drilling of cooling holes in turbine blades. Droplets of molten material are ejected through the entrance ho... Read More

Study of the impacts of droplets deposited from the gas core onto a gas-sheared liquid film (2016)
Journal Article
Cherdantsev, A. V., Hann, D. B., Hewakandamby, B. N., & Azzopardi, B. J. (in press). Study of the impacts of droplets deposited from the gas core onto a gas-sheared liquid film. International Journal of Multiphase Flow, 88, doi:10.1016/j.ijmultiphaseflow.2016.09.015. ISSN 0301-9322

The results of an experimental study on droplet impactions in the flow of a gas-sheared liquid film are presented. In contrast to most similar studies, the impacting droplets were entrained from film surface by the gas stream. The measurements provid... Read More

Experimental investigation into droplet impingement upon moving films using high speed video and thermal imaging (2015)
Conference Proceeding
Mitchell, A. J., Simmons, K., & Hann, D. B. (2015). Experimental investigation into droplet impingement upon moving films using high speed video and thermal imaging. In Volume 1: Advances in Aerospace Technologydoi:10.1115/IMECE2015-51677

Aeroengine bearing chambers are geometrically complex, typically containing shafts, bearings, seals and stationary components. Oil is supplied for lubrication and cooling and so the chamber contains a highly rotating two-phase (oil/air) flow where th... Read More

A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines
Conference Proceeding
Klumpner, C., Al, B., & Hann, D. B. (in press). A power electronic controlled dump load with negligible harmonics for accurate loading used in testing small wind turbines. In 2010 IEEE International Symposium on Industrial Electronicsdoi:10.1109/ISIE.2010.5637240

Permanent magnet synchronous generators (PMSG) are at the core of small scale wind power generators manufactured by a wide range of manufacturers in different configurations: vertical or horizontal axis blades, with various geometries and aerodynamic... Read More

A study of droplet impact on static films using the BB-LIF technique
Journal Article
Hann, D. B., Cherdantsev, A. V., Mitchell, A., McCarthy, I., Hewakandamby, B. N., & Simmons, K. A study of droplet impact on static films using the BB-LIF technique. Experiments in Fluids, ISSN 0723-4864

This paper presents results of single droplet impacts on films of different height taken using the Brightness Based Laser Induced Fluorescence technique (BB-LIF). The dynamics of drop impingement such as the shape of the cavity, residual film thickne... Read More