ORCID Profile
0000-0003-1851-706X
Current Organisation
University of South Australia
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Interdisciplinary Engineering | Interdisciplinary Engineering not elsewhere classified | Non-automotive Combustion and Fuel Engineering (incl. Alternative/Renewable Fuels)
ANZSRC Socio-Economic Objective (SEO)
Energy Storage, Distribution and Supply not elsewhere classified | Solar-Thermal Energy | First Stage Treatment of Ores and Minerals not elsewhere classified |
Related Links
Publications
Experimental and numerical investigation of the flow characteristics within a Solar Expanding-Vortex Particle Receiver-Reactor
Publisher: Elsevier BV
Date: 2017
Numerical and experimental analysis of poly-dispersion effects on particle-laden jets
Publisher: Elsevier BV
Date: 10-2021
Particle Temperature Measurements in a Flow Using Laser-Induced Phosphorescence
Publisher: Avestia Publishing
Date: 06-2017
DOI: 10.11159/HTFF17.137
A scaling law for thrust generating unsteady hydrofoils
Publisher: Elsevier BV
Date: 08-2016
Particle residence time distributions in a vortex-based solar particle receiver-reactor: An experimental, numerical and theoretical study
Publisher: Elsevier BV
Date: 03-2020
Characteristics of swirling and precessing flows generated by multiple confined jets
Publisher: AIP Publishing
Date: 05-2019
DOI: 10.1063/1.5089904
Abstract: An experimental study is reported of the interaction between multiple isothermal jets within a cylindrical chamber under conditions relevant to a wide range of engineering applications, including the confined swirl combustors, industrial mixers, and concentrated solar thermal devices. The particle image velocimetry technique was used to investigate the swirling and precessing flows generated with four rotationally symmetric inlet pipes at a fixed nozzle Reynolds number of ReD = 10 500 for two configurations of swirl angle (5° and 15°) and two alternative tilt angles (25° and 45°). The measurements reveal three distinctive rotational flow patterns within the external recirculation zone (ERZ) and the central recirculation zone (CRZ) for these configurations. It was found that the mean and root-mean-square flow characteristics of the swirl within the chamber depend strongly on the relative significance of the ERZ and CRZ, with the swirling velocity being higher in the CRZ than that in the ERZ. A precessing vortex core was identified for all experimental conditions considered here, although its significance was less for the cases with a dominant CRZ.
The flow-field within a vortex-based solar cavity receiver with an open aperture
Publisher: Elsevier BV
Date: 05-2021
Renormalisation of particle distributions in an initially-biased turbulent jet by swirl and radial injection
Publisher: Elsevier BV
Date: 02-2021
Velocity and orientation distributions of fibrous particles in the near-field of a turbulent jet
Publisher: Elsevier BV
Date: 05-2015
Iso-thermal flow characteristics of rotationally symmetric jets generating a swirl within a cylindrical chamber
Publisher: AIP Publishing
Date: 05-2018
DOI: 10.1063/1.5026719
Abstract: We present a systematic experimental study of the interaction between four rotationally symmetric jets within a cylindrical chamber, under conditions relevant to a wide range of engineering applications, including the technology of a Hybrid Solar Receiver Combustor (HSRC). The HSRC geometry is simplified here to a cylindrical cavity with four inlet jets (representing four burners) which are configured in an annular arrangement and aligned at an inclination angle to the axis with a tangential component (azimuthal angle) to generate a swirl in the chamber. In this study, the jet inclination angle (αj) was varied over the range of 25°–45°, while the jet azimuthal angle (θj) was varied from 5° to 15°. The inlet Reynolds number for each injected jet and the number of jets were fixed at ReD = 10 500 and 4, respectively. Measurements obtained with Particle Image Velocimetry were used to characterise the large-scale flow field within selected configurations. The results reveal a significant dependence of the mean and root-mean-square flow-fields on the jet azimuthal angle (θj) and the jet inclination angle (αj). Three different flow regimes with distinctive flow characteristics were identified within the configurations investigated here. It was also found that θj can significantly influence (a) the position and strength of an external recirculation zone and a central recirculation zone, (b) the extent of turbulence fluctuation, and (c) the flow unsteadiness. Importantly, the effect of αj on the flow characteristics was found to depend strongly on the value of θj.
Influence of Stokes number on the velocity and concentration distributions in particle-laden jets
Publisher: Cambridge University Press (CUP)
Date: 19-09-2014
DOI: 10.1017/JFM.2014.496
Abstract: The first measurement of the influence of the Stokes number on the distributions of particle concentration and velocity at the exit of a long pipe are reported, together with the subsequent influence on the downstream evolution of these distributions through a particle-laden jet in co-flow. The data were obtained by simultaneous particle image velocimetry (PIV) and planar nephelometry (PN), using four cameras to provide high resolution through the first 30 jet diameters and also correction for optical attenuation. These data provide much more detailed information than is available from previous measurements. From them, a new understanding is obtained of how the Stokes number influences the flow at the jet exit plane and how this influence propagates throughout the jet.
The effect of particle size and volumetric loading on the gas temperature distributions in a particle-laden flow heated with high-flux radiation
Publisher: Elsevier BV
Date: 2022
Particle velocity measurement within a free-falling particle curtain using microscopic shadow velocimetry
Publisher: Optica Publishing Group
Date: 23-03-2021
DOI: 10.1364/OE.421017
Abstract: We report an optical method for particle velocity measurement that is suitable for the measurement of particle velocities within dense particle-laden flows with high spatial resolution. The technique is based on particle shadow velocimetry with the use of a long-distance microscopic lens for images collection. The narrow depth of field of the lens allows particles within the focal plane to have much higher pattern intensities than those outside it on the collected images. Data processing was then employed to remove particles from outside the focal plane based on the gradient of the signal and a threshold. Following this, particle velocity was calculated from two successive images in the usual way. The technique was successfully demonstrated in a free-falling particle curtain with volume fractions in the four-way coupling regime of near-spherical micro-particles falling under gravity. The method was successfully employed to measure the transverse velocity profile through the curtain, which is the first time that such a measurement has been performed. Other highly-fidelity experimental data, which is also well suited to model development and validation, include the particle mass flow rate, curtain thickness and opacity.
The influence of aspect ratio on the iso-thermal flow characteristics of multiple confined jets
Publisher: AIP Publishing
Date: 12-2018
DOI: 10.1063/1.5063500
Simian-virus-40 footprints in human lymphoproliferative disorders of HIV− and HIV+ patients
Publisher: Wiley
Date: 09-12-1998
DOI: 10.1002/(SICI)1097-0215(19981209)78:6<669::AID-IJC1>3.0.CO;2-B
Abstract: SV40 sequences were investigated by PCR DNA lification followed by filter hybridization in a series of human lymphoproliferative disorders obtained from human-immunodeficiency-virus (HIV)-seronegative and HIV-infected patients. Our PCR and filter-hybridization conditions enabled us to detect SV40 sequences in the range of 10(-4) to 10(-2) genome equivalents per cell. In non-Hodgkin's lymphomas (NHL) from HIV- patients, SV40 footprints were found in 11 out of 79 (13.9%) s les, while in NHL from HIV+ patients SV40 DNA sequences were detected in 2/16 (12.5%). In Hodgkin's disease (HD), SV40 sequences were found in 7/43 (16.3%) and 1/12 (8.3%) in HIV- and HIV+ patients respectively. A slightly higher prevalence of SV40 footprints was observed in reactive lympho-adenopathies both in HIV- (3/9, 33.3%) and in HIV+ (6/17, 35.3%) patients. Sequence analysis of 2 NHL and 2 HD DNA s les established that the lified PCR products belong to the SV40 sequences. SV40 prevalence and load were similar in s les from HIV-seronegative and HIV-infected in iduals, suggesting that SV40 probably does not undergo strong reactivation phenomena in the context of HIV-related immunosuppression. Moreover, the large T-antigen(Tag) expression was detected by immunohistochemistry in 5/18 SV40-DNA-positive s les analyzed however, few tumor cells (<1%) in 3/5 s les displayed positivity for SV40 Tag, while this viral oncoprotein was revealed in several reactive histiocytes present in all 5 SV40-positive tissues. These results suggest that the lymphoid tissue could represent a reservoir for SV40 and may constitute the first step in understanding whether this DNA tumor polyomavirus has a role in the pathogenesis of human lymphoproliferative disorders.
Luminescence interference to two-colour toluene laser-induced fluorescence thermometry in a particle-laden flow
Publisher: Springer Science and Business Media LLC
Date: 19-03-2020
A method for identifying and characterising particle clusters in a two-phase turbulent jet
Publisher: Elsevier BV
Date: 2017
The effect of instantaneous particle distributions on the gas-phase temperature in an unsteady particle-laden jet heated with high-flux radiation
Publisher: Elsevier BV
Date: 08-2022
Simultaneous imaging of two-phase velocities in particle-laden flows by two-color optical phase discrimination
Publisher: Optica Publishing Group
Date: 05-08-2021
DOI: 10.1364/OL.428357
Abstract: In this Letter, we present a particle image/tracking velocimetry (PIV/PTV) technique for simultaneous velocity measurement of both fluid and particle phases, adopting newly developed optical phase discrimination methods and novel optical particles. Spherical acrylic (PMMA) particles of diameter ∼ O ( 100 µ m ) were used as the particle phase, while fine B A M : E u 2 + phosphors of diameter ∼ O ( 1 µ m ) were used as the fluid tracer. Under Nd:YAG 355 nm laser excitation, both the laser-induced fluorescence (LIF) from PMMA and laser-induced phosphorescence (LIP) from B A M : E u 2 + provided sufficiently strong signals for PIV imaging with two non-intensified cameras and were clearly separable for phase discrimination using spectral filters and temporal profiles. The advantages of the PIV/PTV method include the relatively low cost of B A M : E u 2 + phosphors, high sphericity and narrow size distribution of PMMA particles with LIF emission, and direct optical discrimination eliminating artifacts, while requiring much less computational capacity for PIV/PTV processing of complex particle-laden flows.
Experimental and numerical analysis of low-density gas dispersion characteristics in semi-confined environments
Publisher: Elsevier BV
Date: 12-2023
Three-dimensional flow within shallow, narrow cavities
Publisher: Cambridge University Press (CUP)
Date: 28-10-2013
DOI: 10.1017/JFM.2013.519
Abstract: The three-dimensional structure of incompressible flow in a narrow, open rectangular cavity in a flat plate was investigated with a focus on the flow topology of the time-averaged flow. The ratio of cavity length (in the direction of the flow) to width to depth was $l{: }w{: }d= 6{: }2{: }1$ . Experimental surface pressure data (in air) and particle image velocimetry data (in water) were obtained at low speed with free-stream Reynolds numbers of ${\\mathit{Re}}_{l} = 3. 4\\times 1{0}^{5} $ in air and ${\\mathit{Re}}_{l} = 4. 3\\times 1{0}^{4} $ in water. The experimental results show that the three-dimensional cavity flow is of the ‘open’ type, with an overall flow structure that bears some similarity to the structure observed in nominally two-dimensional cavities, but with a high degree of three-dimensionality both in the flow near the walls and in the unsteady behaviour. The defining features of an open-type cavity flow include a shear layer that traverses the entire cavity opening ultimately impinging on the back surface of the cavity, and a large recirculation zone within the cavity itself. Other flow features that have been identified in the current study include two vortices at the back of the cavity, of which one is barely visible, a weak vortex at the front of the cavity, and a pair of counter-rotating streamwise vortices along the sides of the cavity near the cavity opening. These vortices are generally symmetric about the cavity centre-plane. However, the discovery of a single tornado vortex, located near the cavity centreline at the front of the cavity, indicated that the flow within the cavity is asymmetric. It is postulated that the observed asymmetry in the time-averaged flow field is due to the asymmetry in the instantaneous flow field, which switches between two extremes at large time scales.
The effect of Stokes number on particle velocity and concentration distributions in a well-characterised, turbulent, co-flowing two-phase jet
Publisher: Cambridge University Press (CUP)
Date: 09-11-2016
DOI: 10.1017/JFM.2016.666
Abstract: Simultaneous measurements of particle velocity and concentration (number density) in a series of mono-disperse, two-phase turbulent jets issuing from a long, round pipe into a low velocity co-flow were performed using planar nephelometry and digital particle image velocimetry. The exit Stokes number, $Sk_{D}$ , was systematically varied over two orders of magnitude between 0.3 and 22.4, while the Reynolds number was maintained in the turbulent regime ( $10\\,000\\leqslant Re_{D}\\leqslant 40\\,000$ ). The mass loading was fixed at $\\unicode[STIX]{x1D719}=0.4$ , resulting in a flow that is in the two-way coupling regime. The results show that, in contrast to all previous work where a single Stokes number has been used to characterise fluid–particle interactions, the characteristic Stokes number in the axial direction is lower than that for the radial direction. This is attributed to the significantly greater length scales in the axial motions than in the radial ones. It further leads to a preferential response of particles to gas-phase axial velocity fluctuations, $u_{p}^{\\prime }$ , over radial velocity fluctuations, $v_{p}^{\\prime }$ . This, in turn, leads to high levels of anisotropy in the particle-phase velocity fluctuations, $u_{p}^{\\prime }/v_{p}^{\\prime } $ , throughout the jet, with $u_{p}^{\\prime }/v_{p}^{\\prime }$ increasing as $Sk_{D}$ is increased. The results also show that the region within the first few diameters of the exit plane is characterised by a process of particle reorganisation, resulting in significant particle migration to the jet axis for $Sk_{D}\\leqslant 2.8$ and away from the axis for $Sk_{D}\\geqslant 5.6$ . This migration, together with particle deceleration along the axis, causes local humps in the centreline concentration whose value can even exceed those at the exit plane.
Experimental and numerical investigation on the geometric parameters of an open-to-atmosphere vortex-based solar particle receiver
Publisher: Elsevier BV
Date: 09-2022
The dominant underlying parameters controlling the dispersion of falling particle curtains
Publisher: Elsevier BV
Date: 04-2022
Resolving the three-dimensional structure of particles that are aerodynamically clustered by a turbulent flow
Publisher: AIP Publishing
Date: 07-2019
DOI: 10.1063/1.5110323
Abstract: We report the first definitive experimental measurement of the four-dimensional (three spatial and one temporal) structure of particles that are aerodynamically clustered. High-speed tomographic imaging of a particle-laden turbulent flow was utilized to detect the temporal evolution of particle clusters at the exit of a long pipe. The measurements confirm that the particle clusters are coherent and ropelike in shape, rather than sheetlike, resolving a question that was not possible to address from previous two-dimensional measurements. These clusters are present right from the exit plane, where they are preferentially located near the jet edge, suggesting that they are generated inside the pipe close to the pipe wall.
Particle residence time distributions in a vortex-based solar particle receiver-reactor: The influence of receiver tilt angle
Publisher: Elsevier BV
Date: 09-2019
A Novel Temperature-Independent Model for Estimating the Cooling Energy in Residential Homes for Pre-Cooling and Solar Pre-Cooling
Publisher: MDPI AG
Date: 06-12-2022
DOI: 10.3390/EN15239257
Abstract: Australia’s electricity networks are experiencing low demand during the day due to excessive residential solar export and high demand during the evening on days of extreme temperature due to high air conditioning use. Pre-cooling and solar pre-cooling are demand-side management strategies with the potential to address both these issues. However, there remains a lack of comprehensive studies into the potential of pre-cooling and solar pre-cooling due to a lack of data. In Australia, however, extensive datasets of household energy measurements, including consumption and generation from rooftop solar, obtained through retailer-owned smart meters and household-owned third-party monitoring devices, are now becoming available. However, models presented in the literature which could be used to simulate the cooling energy in residential homes are temperature-based, requiring indoor temperature as an input. Temperature-based models are, therefore, precluded from being able to use these newly available and extensive energy-based datasets, and there is a need for the development of new energy-based simulation tools. To address this gap, a novel data-driven model to estimate the cooling energy in residential homes is proposed. The model is temperature-independent, requiring only energy-based datasets for input. The proposed model was derived by an analysis comparing the internal free-running and air conditioned temperature data and the air conditioning data for template residential homes generated by AccuRate, a building energy simulation tool. The model is comprised of four linear equations, where their respective slope intercepts represent a thermal efficiency metric of a thermal zone in the template residential home. The model can be used to estimate the difference between the internal free-running, and air conditioned temperature, which is equivalent to the cooling energy in the thermal zone. Error testing of the model compared the difference between the estimated and AccuRate air conditioned temperature and gave average CV-RMSE and MAE values of 22% and 0.3 °C, respectively. The significance of the model is that the slope intercepts for a template home can be applied to an actual residential home with equivalent thermal efficiency, and a pre-cooling or solar pre-cooling analysis is undertaken using the model in combination with the home’s energy-based dataset. The model is, therefore, able to utilise the newly available extensive energy-based datasets for comprehensive studies on pre-cooling and solar pre-cooling of residential homes.
Single-shot planar temperature imaging of radiatively heated fluidized particles
Publisher: The Optical Society
Date: 06-11-2017
DOI: 10.1364/OE.25.028764
Characterization of prelymphomatous stages of B cell lymphoproliferation in Sjögren's syndrome
Publisher: Wiley
Date: 02-1997
Abstract: To determine whether the prelymphomatous stages of B cell lymphoproliferation in Sjögren's syndrome (SS) may be better characterized by the integration of clinical, pathologic, and molecular data, the latter focusing on the expansion, persistence, and dissemination of clonal B cells in the course of the disease. Multiple tissue lesions (synchronous from different tissues and metachronous from the same tissue) were evaluated in biopsy specimens obtained from 6 consecutive patients with SS who had an associated lymphoproliferative disorder. Fully benign gastric lesions were evaluated in tissue from an additional 11 patients with SS who had no associated lymphoproliferative disorder. Multiple and complementary molecular analyses of B cell clonality were used: Southern blot, polymerase chain reaction, single-strand conformation polymorphism, DNA sequencing, and hybridization with clonospecific oligoprobes. All the patients were then strictly followed up for the appearance of lymphoma. Different scenarios of SS-associated B cell lymphoproliferation were identified: 1) the ongoing expansion of the same dominant clone, localized or disseminated, in tissue from 2 patients, 1 of whom later developed an overt B cell lymphoma 2) different dominant clones in different synchronous or metachronous tissues from the remaining 4 patients with an associated lymphoproliferative disorder and 3) small oligoclonal expansions in 7 of the 11 benign gastric lymphoid infiltrates. Prelymphomatous B cell lymphoproliferation in SS was better characterized following integration of the findings. The different types of B cell clonal expansion (oligoclonal or monoclonal, smaller or larger in size, fluctuating or established, localized or disseminated) may imply a different risk of lymphoma progression. An accurate clinical, histopathologic, and molecular characterization may therefore be crucial in future studies aimed at clarifying the pathobiology of SS-associated lymphoproliferation.
Measured global thermal performance of a directly irradiated suspension-flow solar particle receiver with an open aperture
Publisher: Elsevier BV
Date: 2022
Insights from a new method providing single-shot, planar measurement of gas-phase temperature in particle-laden flows under high-flux radiation
Publisher: Springer Science and Business Media LLC
Date: 31-03-2021
Direct measurements and prediction of the particle egress from a vortex-based solar cavity receiver with an open aperture
Publisher: Elsevier BV
Date: 03-2022
A new correlation between soot sheet width and soot volume fraction in turbulent non-premixed jet flames
Publisher: Elsevier BV
Date: 2019
Experimental and numerical investigation of the iso-thermal flow characteristics within a cylindrical chamber with multiple planar-symmetric impinging jets
Publisher: AIP Publishing
Date: 10-2017
DOI: 10.1063/1.4986132
Abstract: We present a joint experimental and numerical study of the flow structure within a cylindrical chamber generated by planar-symmetric isothermal jets, under conditions of relevance to a wide range of practical applications, including the Hybrid Solar Receiver Combustor (HSRC) technology. The HSRC features a cavity with a coverable aperture to allow it to be operated as either a combustion chamber or a solar receiver, with multiple burners to direct a flame into the chamber and a heat exchanger that absorbs the heat from both energy sources. In this study, we assess the cases of two or four inlet jets (simulating the burners), configured in a planar-symmetric arrangement and aligned at an angle to the axis (αj) over the range of 0°–90°, at a constant inlet Reynolds number of ReD = 10 500. The jets were positioned in the same axial plane near the throat and interact with each other and the cavity walls. Measurements obtained with particle image velocimetry were used together with numerical modeling employing Reynolds-averaged Navier-Stokes methods to characterize the large-scale flow field within selected configurations of the device. The results reveal a significant dependence of the mean flow-field on αj and the number of inlet jets (Nj). Four different flow regimes with key distinctive features were identified within the range of αj and Nj considered here. It was also found that αj has a controlling influence on the extent of back-flow through the throat, the turbulence intensity, the flow stability, and the dominant recirculation zone, while Nj has a secondary influence on the turbulence intensity, the flow stability, and the transition between each flow regime.
Understanding of turbulence modulation and particle response in a particle-laden jet from direct numerical simulations
Publisher: Cambridge University Press (CUP)
Date: 13-10-2022
DOI: 10.1017/JFM.2022.764
Abstract: Point-particle direct numerical simulations have been employed to quantify the turbulence modulation and particle responses in a turbulent particle-laden jet in the two-way coupled regime with an inlet Reynolds number based on bulk velocity and jet diameter $({D_j})$ of ~10 000. The investigation focuses on three cases with inlet bulk Stokes numbers of 0.3, 1.4 and 11.2. Special care is taken to account for the particle–gas slip velocity and non-uniform particle concentrations at the nozzle outlet, enabling a reasonable prediction of particle velocity and concentration fields. Turbulence modulation is quantified by the variation of the gas-phase turbulent kinetic energy (TKE). The presence of the particle phase is found to d the gas-phase TKE in the near-field region within $5{D_j}$ from the inlet but subsequently increases the TKE in the intermediate region of (5–20) D j . An analysis of the gas-phase TKE transport equation reveals that the direct impact of the particle phase is to dissipate TKE via the particle-induced source term. However, the finite inertia of the particle phase affects the gas-phase velocity gradients, which indirectly affects the TKE production and dissipation, leading to the observed TKE attenuation and enhancement. Particle response to the gas-phase flow is quantified. Particles are found to exhibit notably stronger response to the gas-phase axial velocity than to the radial velocity. A new dimensionless figure is presented that collapses both the axial and radial components of the particle response as a function of the local Stokes number based on their respective integral length scales.
Impact of different types of channels on Thermo-hydraulic performance of a sodium-sCO2 Printed circuit heat exchanger for supercritical Brayton cycle applications
Publisher: Elsevier BV
Date: 11-2022
First-of-a-kind investigation on performance of a directly-irradiated windowless vortex-based particle receiver
Publisher: AIP Publishing
Date: 2020
DOI: 10.1063/5.0028712
Non-intrusive temperature measurement of particles in a fluidised bed heated by well-characterised radiation
Publisher: Elsevier BV
Date: 03-2018
Laser Attenuation Correction for Planar Nephelometry Concentration Measurements
Publisher: Springer Science and Business Media LLC
Date: 25-04-2016
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Related Funding Activities
Linkage Infrastructure, Equipment And Facilities - Grant ID: LE200100220
Start Date: 07-2020
End Date: 02-2022
Amount: $760,000.00
Funder: Australian Research Council
View Funded Activity