Christopher Abram
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View article: Host Tuned Luminescence Lifetime Thermometers for Imaging Boiling Thermal Dynamics Through Bubbles
Host Tuned Luminescence Lifetime Thermometers for Imaging Boiling Thermal Dynamics Through Bubbles Open
Phase changes are ubiquitous in critical thermal processes (wing icing, boiling, spray cooling). In this study, luminescence thermometry is used to shed new light on the surface thermal dynamics of a boiling flow. To minimize the impact of…
View article: Effect of annealing conditions on the luminescence properties and thermometric performance of Sr<sub>3</sub>Al<sub>2</sub>O<sub>5</sub>Cl<sub>2</sub>:Eu<sup>2+</sup> and SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup> phosphors
Effect of annealing conditions on the luminescence properties and thermometric performance of Sr<sub>3</sub>Al<sub>2</sub>O<sub>5</sub>Cl<sub>2</sub>:Eu<sup>2+</sup> and SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup> phosphors Open
Divalent europium emission from distinct sites in the Sr 3 Al 2 O 5 Cl 2 host results in two emission bands. The ratio of intensities of these bands is strongly temperature sensitive and can be exploited for two colour ratio-based luminesc…
View article: Bismuth-doped rare-earth orthovanadates as tunable luminescence decay-time thermometers
Bismuth-doped rare-earth orthovanadates as tunable luminescence decay-time thermometers Open
If the temperature-sensitive range of luminescent thermometers could be continuously adjusted by the material properties, a sensor material could be selected to finely resolve key thermal phenomena occurring around specific temperatures, s…
View article: Bismuth-doped rare-earth orthovanadates as tunable luminescence decay-time thermometers
Bismuth-doped rare-earth orthovanadates as tunable luminescence decay-time thermometers Open
If the temperature-sensitive range of luminescent thermometers could be continuously adjusted by the material properties, a sensor material could be selected to finely resolve key thermal phenomena occurring around specific temperatures, s…
View article: Applications Of Thermographic Particle Image Velocimetry To Film Cooling Flow Experiments In A Closed Loop Wind Tunnel
Applications Of Thermographic Particle Image Velocimetry To Film Cooling Flow Experiments In A Closed Loop Wind Tunnel Open
A laser-imaging method based on thermographic phosphor tracer particles (thermographic particle image velocimetry) is used to simultaneously measure temperature and velocity fields in film cooling flows in wind tunnels, in order to compare…
View article: Investigating the Influence of Mainstream Turbulence and Large Vortices on Gas Turbine Trenched Film Cooling Flows Using Planar Temperature-Velocity Imaging
Investigating the Influence of Mainstream Turbulence and Large Vortices on Gas Turbine Trenched Film Cooling Flows Using Planar Temperature-Velocity Imaging Open
Film cooling is a critical gas turbine technology to reduce heat loads on the combustion chamber and the turbine vanes and blades. To improve film cooling performance, trenched cooling configurations where the holes are connected by a cros…
View article: Time-resolved temperature and velocity field measurements in gas turbine film cooling flows with mainstream turbulence
Time-resolved temperature and velocity field measurements in gas turbine film cooling flows with mainstream turbulence Open
Gas turbine film cooling strategies must provide adequate cooling performance under high levels of mainstream turbulence. Detailed information about the structure, dynamics and transport of the cooling films is needed to understand the flo…
View article: At home in the fens with the Grendelkin
At home in the fens with the Grendelkin Open
How do we become spatially intimate with Beowulf? Where do we feel closest to this poem? This essay locates the essential space of Beowulf not in Beowulf's indistinct Scandinavian homeland, nor under the bright lights of the 'historical' H…
View article: Characterisation of dispersed phosphor particles for quantitative photoluminescence measurements
Characterisation of dispersed phosphor particles for quantitative photoluminescence measurements Open
Appropriate characterisation methods are necessary to probe the photoluminescence properties of phosphor particles, in order to develop new and more efficient materials and broaden the scope of their application. In this work, experiments …
View article: Investigation of the tin-doped phosphor (Sr,Mg)<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>:Sn<sup>2+</sup> for fluid temperature measurements
Investigation of the tin-doped phosphor (Sr,Mg)<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>:Sn<sup>2+</sup> for fluid temperature measurements Open
The photoluminescence properties of the phosphor (Sr,Mg)3(PO4)2:Sn2+ were investigated for luminescence thermometry in fluids. The luminescence emission intensity at 300 K is on the order of 106 photons per particle and the lifetime is 26 …
View article: Flame synthesis of nanophosphors using sub-micron aerosols
Flame synthesis of nanophosphors using sub-micron aerosols Open
A flame synthesis approach is described for producing metal oxide nanoparticles. It is based on a novel microjet atomisation technique, which generates solution aerosol droplets in the sub-micron range with a mean diameter of 200 nm. Here,…
View article: Planar measurements of spray-induced wall cooling using phosphor thermometry
Planar measurements of spray-induced wall cooling using phosphor thermometry Open
The wall cooling induced by spray impingement is investigated using phosphor thermometry. Thin coatings of zinc oxide (ZnO) phosphor were applied with a transparent chemical binder onto a steel surface. Instantaneous spatially resolved tem…
View article: Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles
Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles Open
Optical diagnostics for fluid temperature measurements continue to further our understanding of flows involving heat transfer and/or chemical reactions, which are intrinsic to key areas including energy production, the process industries, …
View article: Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles
Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles Open
Temperature measurement techniques for gas and liquid flows using thermographic phosphor tracer particles
View article: Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu^2+ phosphor particles for thermometry
Thermographic laser Doppler velocimetry using the phase-shifted luminescence of BAM:Eu^2+ phosphor particles for thermometry Open
Simultaneous point measurements of gas velocity and temperature were recently demonstrated using thermographic phosphors as tracer particles. There, continuous wave (CW) excitation was used and the spectral shift of the luminescence was de…
View article: Simultaneous kHz-rate temperature and velocity field measurements in the flow emanating from angled and trenched film cooling holes
Simultaneous kHz-rate temperature and velocity field measurements in the flow emanating from angled and trenched film cooling holes Open
To design more efficient film cooling geometries for gas turbines, non-intrusive measurements of the flow temperature, velocity and derived quantities like the turbulent heat flux are needed in well-defined, generic flow configurations. Wi…
View article: Development of the Thermographic Laser Doppler Velocimetry Technique
Development of the Thermographic Laser Doppler Velocimetry Technique Open
Simultaneous measurements of flow temperature and velocity are crucial in characterising turbulent heat transport processes. The advancement of particle-based velocimetry methods has provided both qualitative and quantitative description o…
View article: Temperature field measurements in liquids using ZnO thermographic phosphor tracer particles
Temperature field measurements in liquids using ZnO thermographic phosphor tracer particles Open
Temperature field measurements in liquids are demonstrated using zinc oxide (ZnO) thermographic phosphor particles. The particles are added to the liquid as a tracer. Following laser excitation, the temperature-dependent luminescence emiss…