Programme
- Day 1 Monday 2 December Room: Eng South S111
- Day 2 Tuesday 3 December Room: Eng South S111
- Day 3 Wednesday 4 December Room: Eng South S111
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Join us at the ACLD Welcome.
Understanding and predicting the transition from gas-phase fuel species through to the formation of solid-phase soot is a significant challenge that despite many decades of research and significant progress, is still an active and growing research area. While significant progress has been made with ex-situ techniques, laser diagnostics offer the unique insights as well as the ability to make spatially and time-resolved measurements which are required to understand soot formation in turbulent systems.
Engineers are confronted by a wide array of flows which exhibit and in many cases are either solely or partially driven by density gradients. The past 20 years have seen significant advancement in our ability to experimentally measure instantaneous velocity fields to the extent that time-resolved volumetric velocity fields measurements are now possible. However, quantifying instantaneous density fields remains a challenge.
A promising, non-intrusive laser diagnostic technique for analysing hypersonic gas flow structures is the Focusing Laser Differential Interferometer (FLDI). The instrument determines density gradients of test flows by using changes in phase between two spatially separated focused beams.
Three-dimensional (3D) Lagrangian Particle Tracking (LPT) was performed using the Shake-The-Box (STB) algorithm on a subsonic round jet flow at Mach 0.845. The STB technique for four-pulse data was employed to reconstruct particle tracks along the four-pulse sequences providing highly resolved 3D flow velocity and material acceleration data. A description of the experimental methodology is given followed by instantaneous accelerations and averaged flow statistics.
This paper reports on the study of the effect of nozzle hole number and mixture formulation on the spray from a device designed to simulate the pressurised metered dose inhaler.
Digital holographic microscopic particle image velocimetry (DHM-PIV) provides 3 component 3-dimensional (3C-3D) flow velocity information which is the most comprehensive way to investigate a wide range of fluid phenomenon in both micro and macro fluidics. DHM-PIV offers 3D flow measurement with high spatio-temporal resolution, minimal optical setup and easy calibration compared to other 3D PIV techniques such as tomographic PIV, defocusing PIV, etc.
The detection of ethylene (ethene) gas at parts-per-million concentrations is important for agricultural product transportation, storage and retailing, since ethylene affects the ripening behaviour of many fruit species.
Heavy metal ions are extremely persistent contaminants that cannot be degraded by conventional treatments, and bioaccumulate in humans and wildlife. Exposure to heavy metal ions is a critical threat to our environment and health. Conventional analytical techniques have limitations (low selectivity, long processing times, high costs, cross-contamination, low throughput) that severely constrain our ability for efficient detection of heavy metals in the environment. We urgently need advanced diagnostic technologies to guide and maximise heavy metal remediation efforts.
Supersonic impinging jets have diverse practical applications like VTOL aircraft exhaust jet noise, ground erosion during rocket launch and surface finish in cold gas spray additive manufacturing processes.
The distribution of OH radicals has been visualised within a hypersonic shock tunnel. Unexpected fluorescence was observed in the flow that passed around a supersonic combustor model.
A focused laser differential interferometer has been designed for the investigation of freestream and boundary layer flows produced in the University of Southern Queensland’s hypersonic wind tunnel.
High speed tomographic particle image velocimetry was utilised to measure the four dimensional distributions of particles at the exit of a particle-laden turbulent pipe-jet under conditions where particle clustering was previously shown to occur.
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Lasers have been used for more than fifty years to investigate fluid behaviour, because of their many quantifiable characteristics, which makes them versatile enough to measure a number of state variables. In the author’s research field of hypersonic flows, the ability to change the laser properties rapidly is of paramount importance, because the flow conditions change rapidly and the flows are of very limited duration.
Experimental density field measurements are critical in describing the dynamics of turbulent convective heat transfer and mixing. In turbulent flows, the density field is strongly three-dimensional and varies with time.
The influence of interference from solid particles on gas-phase temperature measurements using two-colour laser induced fluorescence (LIF) thermometry was analysed for two different particle types, PMMA and ZnO:Zn.
This paper presents a low-cost technique for accurate in situ measurement of the laser sheet thickness.
Accurate diagnosis of human diseases at an early stage is crucial for efficient medical treatment and human health. Most complicated diseases such as cancer need high-throughput multiplex analysis to provide an overall profile, but traditional fluorescence technique undergoes various limitation in modern bioanalysis. Raman scattering and surface enhanced Raman scattering (SERS) have shown technical advantages in multiplex analysis associated with their narrow vibrational spectrum.
This paper introduces a holography reconstruction method that overcomes some of the problems of digital in-line holography.
Optical Coherence Tomography (OCT) is a non-invasive cross-sectional imaging technique based on the principle of laser interferometry. Normally, the lateral field of view of a low-coherence interferometric OCT is limited to a single-spot of a sample; thus, available OCT techniques can take significant time to scan large objects. This paper presents a novel multi-channel spectral domain Optical Coherence Tomography (SD-OCT) method involving spectral-slicing of broadband low-coherence light to enable the simultaneous acquisition of images from multiple lateral positions of a target.
Rotational coherent anti-Stokes Raman scattering (RCARS) utilizing a 30 ps pulse duration laser is explored in this paper.
Focused Laser Differential Interferometry (FLDI), a non-intrusive optical diagnostic technique was set up and characterized using turbulent jets. A 90° phase shift interferometry setting, a key requirement to remove phase ambiguity is obtained by traversing the second Wollaston prism perpendicular to the beam axis.
Microwave assisted laser-induced breakdown spectroscopy (MW-LIBS) has been applied spectroscopically to detect chlorine and fluorine at ambient conditions.
This paper presents a new method to produce monodisperse supercooled refrigerant droplets, comparing the breakup mechanism to the Plateau-Rayleigh instability.
The temperature measurement of phosphors, heated by high radiation flux, has been investigated. Laser induced phosphorescence (LIP) has been applied to yield non-intrusive surface temperature of moving particles in multiphase flow.
The arteriovenous fistula (AVF) is a vascular structure that is surgically created for kidney failure patients, to allow them to undergo haemodialysis efficiently. An AVF is susceptible to many vascular diseases which are associated with the disturbed nature of the flow in the unnatural geometry of the vessels. The current study examines the flow within the anastomosis and juxta-anastomotic regions of an AVF.
Turbulent mixing of multi-phase compressible jets formed within steam ejectors requires further investigation so that reliable models can be developed to aid the ejector design process. Tunable Diode Laser Absorption Spectroscopy (TDLAS) was applied to measure properties in a supersonic steam jet formed downstream from an ejector nozzle.
Understanding the flow features near the stenosis location inside a coronary artery is critical for identifying the possible mechanisms contributing to the disease progression. In this study, a Planar Particle Image Velocimetry (PIV) was employed to study the mean and instantaneous flow fields downstream of a semi-blocked artery model.
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Imaging through optically turbid media such as atomizing spray systems is challenging due to multiple light scattering inside the object. Such multiply scattered light deteriorates the desired signal, often by generating a diffuse background. To address this, we at the Division of Combustion Physics at Lund University have developed a laser-based imaging technique called Structured Laser Illumination Planar Imaging (SLIPI) that is capable of separating the sought signal component (either unperturbed or singly scattered light) from the contribution arising due to multiple light scattering.
Quantum cascade lasers (QCL) have revolutionized the spectroscopic investigations due to their unique capability of providing access to the fingerprint mid-infrared wavelength region. Laser absorption diagnostics based on QCLs thus enable quantitative, time-resolved species concentration and temperature measurements in complex chemically reactive systems. This talk will discuss some of the recent applications of QCLs to chemical kinetic studies.
Over past few years, several laser diagnostic techniques used for the measurements of lab-scale turbulent sooting flames have been developed and applied in the combustion group of the University of Adelaide. In this talk, the details of these unique technique will be reviewed, particularly focusing on the technical details.
Revolutionary advances in both ultrashort-pulse (femtosecond) and high-repetition-rate (burst-mode) lasers are driving the advancement of existing diagnostic techniques and enabling the development of new measurement approaches for the detailed study of the chemistry and physics of reacting flows and plasmas.
