Professor Yannis Hardalupas
Mechanical Engineering Department
Imperial College London
Yannis Hardalupas received his Mechanical Engineering degree from National Technical University of Athens, Greece, followed by PhD at Imperial College London. He was awarded an EPSRC Advanced Research Fellowship for experimental research on combustion of liquid and solid fuels before joining the academic staff at the Mechanical Engineering Department of Imperial College, where he was promoted to Professor in 2009. In 2000, he spent a year at Ricardo Consulting Engineers working on computational models for liquid atomization through a Royal Academy of Engineering industrial secondment award. His research covers combustion, heat and mass transfer, liquid atomisation and sprays and the development and application of novel optical and laser diagnostics. The latter led to patents for instruments on powder sizing, planar droplet sizing, nanoparticle sizing and novel imaging devices. His research contributed to gas- and liquid- fuelled land-based gas turbines, coal burners, aeroengines, gasoline and Diesel engines and liquid propellant rocket engines. He also researched spray drying and Cleaning-In-Place processes for the chemical and food industry and ‘nanofluids’ as improved coolants for fusion and fission reactors. He is a Fellow of the Institute of Physics and Associate Fellow and member of the technical committee of Propellants and Combustion of the American Institute of Aeronautics and Astronautics. He chairs the Combustion Physics Group of the Institute of Physics, is an Editor of Experimental Thermal and Fluid Science and serves at the advisory and editorial boards of Experiments in Fluids and Int. J. of Spray and Combustion Dynamics.
Title: Atomisation of sustainable liquid fuels for low carbon powerplants
Abstract: Conventional hydrocarbon liquid fuels are used for land and marine transportation, aviation and power generation. However, they contribute to the increase of carbon dioxide in the atmosphere with consequences on climate change. New synthetic fuels are proposed, which are sustainable since they are produced from renewable energy sources by re-using captured CO2 (e.g. e-fuels, Sustainable Aviation Fuels), or biomass-derived fuels (e.g. biofuels). The sustainable liquid fuels can be used in existing powerplants, allowing fast deployment with limited change at the infrastructure, and therefore can deliver faster reduction of the CO2 emissions. However, these new fuels may have variable liquid properties (i.e. surface tension, density, viscosity), which may modify the atomization characteristics and influence the combustion process of current powerplants. The talk will consider the physics of the atomization and assess the potential impact of the liquid properties on spray characteristics. It will focus on the application of novel laser based diagnostics to characterize the primary liquid breakup process at the near nozzle region of atomizers, which determines the downstream spray characteristics. It will demonstrate why current scaling approaches of the atomization process may fail to capture changes of the spray characteristics and suggest additional physical process that may explain changes in the spray characteristics.