ORCID Profile
0000-0002-5666-1890
Current Organisation
UNSW Sydney
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Publisher: Elsevier BV
Date: 10-2017
Publisher: Optica Publishing Group
Date: 04-03-2010
DOI: 10.1364/AO.49.001257
Publisher: American Chemical Society (ACS)
Date: 19-09-2016
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 07-2009
Publisher: SAE International
Date: 04-2014
DOI: 10.4271/2014-01-1413
Publisher: ASMEDC
Date: 2010
DOI: 10.1115/IHTC14-23422
Abstract: Recent advances in diagnostic methods are providing new capacity for detailed measurement of turbulent, reacting flows in which heat transfer is dominant. Radiation typically becomes dominant in flames containing soot and/or with sufficient physical size, so is important in many flames of practical significance. The presence of particles, including soot, increases the coupling between the turbulence, chemistry and radiative heat transfer processes. Particles also increase the difficulties of laser-based measurements by increasing the interferences to the signal and the attenuation of the beam. The paper reviews recent advances in techniques to measure temperature, mixture fraction, soot volume fraction, velocity, particle number density and the scattered, absorbed and transmitted components of radiation propagation through particle laden systems.
Publisher: Springer Science and Business Media LLC
Date: 06-2022
Publisher: Elsevier BV
Date: 2017
Publisher: SAE International
Date: 17-10-2016
DOI: 10.4271/2016-01-2162
Publisher: SAE International
Date: 11-2014
DOI: 10.4271/2014-01-9079
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 02-2012
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 08-2014
Publisher: Elsevier BV
Date: 11-2018
Publisher: Informa UK Limited
Date: 26-12-2018
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 08-2018
Publisher: MDPI AG
Date: 26-01-2018
DOI: 10.3390/NANO8020070
Abstract: High-performance poly(1,4-butylene terephthalate) (PBT) nanocomposites have been developed via the consideration of phosphorus-containing agents and amino-carbon nanotube (A-CNT). One-pot functionalization method has been adopted to prepare functionalized CNTs via the reaction between A-CNT and different oxidation state phosphorus-containing agents, including chlorodiphenylphosphine (DPP-Cl), diphenylphosphinic chloride (DPP(O)-Cl), and diphenyl phosphoryl chloride (DPP(O3)-Cl). These functionalized CNTs, DPP(Ox)-A-CNTs (x = 0, 1, 3), were, respectively, mixed with PBT to obtain the CNT-based polymer nanocomposites through a melt blending method. Scanning electron microscope observations demonstrated that DPP(Ox)-A-CNT nanoadditives were homogeneously distributed within PBT matrix compared to A-CNT. The incorporation of DPP(Ox)-A-CNT improved the thermal stability of PBT. Moreover, PBT/DPP(O3)-A-CNT showed the highest crystallization temperature and tensile strength, due to the superior dispersion and interfacial interactions between DPP(O3)-A-CNT and PBT. PBT/DPP(O)-A-CNT exhibited the best flame retardancy resulting from the excellent carbonization effect. The radicals generated from decomposed polymer were effectively trapped by DPP(O)-A-CNT, leading to the reduction of heat release rate, smoke production rate, carbon dioxide and carbon monoxide release during cone calorimeter tests.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Informa UK Limited
Date: 02-08-2017
Publisher: Springer Science and Business Media LLC
Date: 05-2016
Publisher: Elsevier BV
Date: 09-2011
Publisher: Informa UK Limited
Date: 26-07-2022
Publisher: American Chemical Society (ACS)
Date: 13-11-2020
Publisher: American Chemical Society (ACS)
Date: 31-10-2018
Abstract: A novel three-dimensional (3D) epoxy/graphene nanosheet/hydroxylated boron nitride (EP/GNS/BNOH) hybrid aerogel was successfully fabricated in this study. This was uniquely achieved by constructing a well-defined and interconnected 3D network architecture. The manufacturing process of EP/GNS/BNOH involved a simple one-pot hydrothermal strategy, followed by the treatment of freeze-drying and high-temperature curing. In comparison with EP/GNS-3, EP/GNS/BNOH-3 demonstrated improvement of 97% for compressive strength at 70% strain. Through compression tests, fracture occurred for EP/GNS-3 at ninth compression cycles, whereas EP/GNS/BNOH-3 retained its original form after twenty compression cycles, with a residual height of 97% (i.e., only 3% reduction). By the addition of BNOH in the polymer matrix, the dynamic heat transfer and dissipation rates of EP/GNS/BNOH aerogels were also considerably reduced, indicating that the aerogel with BNOH additive possessed excellent thermal insulation properties. Thermogravimetric analysis results revealed that the thermal stabilities of EP/GNS and EP/GNS/BNOH aerogels were improved with increasing loading of EP, and EP/GNS/BNOH aerogels exhibited a better thermal stability at high temperatures. Through the elevated levels attained in the compressive strength, superelasticity, and thermal resistance, EP/GNS/BNOH aerogels has the great potential of being a very effective thermal insulation material to be utilized across a board range of applications in building, automotive, spacecraft, and mechanical systems.
Publisher: MDPI AG
Date: 08-03-2019
DOI: 10.3390/EN12050910
Abstract: In this article, the evolution of in-flame soot species in a slow speed, buoyancy-driven diffusion flame is thoroughly studied with the implementation of the population balance approach in association with computational fluid dynamics (CFD) techniques. This model incorporates interactive fire phenomena, including combustion, radiation, turbulent mixing, and all key chemical and physical formation and destruction processes, such as particle inception, surface growth, oxidation, and aggregation. The in-house length-based Direct Quadrature Method of Moments (DQMOM) soot model is fully coupled with all essential fire sub-modelling components and it is specifically constructed for low-speed flames. Additionally, to better describe the combustion process of the parental fuel, ethylene, the strained laminar flamelet model, which considers detailed chemical reaction mechanisms, is adopted. Numerical simulation is validated against a self-conducted co-flow slot burner experimental measurement. A comprehensive assessment of the effect of adopting different nucleation laws, oxidation laws, and various fractal dimension and diffusivity values is performed. The results suggest the model employing Moss law of nucleation, modified NSC law of oxidation, and adopting a fractal dimension value of 2.0 and Schmidt number of 0.9 yields the simulation result that best agreed with experimental data.
Publisher: SAGE Publications
Date: 07-2012
DOI: 10.1366/11-06553
Abstract: This paper presents the first demonstration of the pulsed laser ablation technique to seed a laminar non-reacting gaseous jet at atmospheric pressure. The focused, second harmonic from a pulsed Nd:YAG laser is used to ablate a neutral indium rod at atmospheric pressure and temperature. The ablation products generated with the new seeding method are used to seed the jet, as a marker of the scalar field. The neutral indium atoms so generated are found to be stable and survive a convection time of the order of tens of seconds before entering the interrogation region. The measurements of planar laser-induced fluorescence (PLIF) with indium and laser nephelometry measurements with the ablation products are both reported. The resulting average and root mean square (RMS) of the measurements are found to agree reasonably well although some differences are found. The results show that the pulsed laser ablation method has potential to provide scalar measurement for mixing studies.
Publisher: American Chemical Society (ACS)
Date: 03-07-2019
Publisher: SAGE Publications
Date: 02-2010
DOI: 10.1366/000370210790619573
Abstract: This work investigates the first demonstration of nonlinear regime two-line atomic fluorescence (NTLAF) thermometry in laminar non-premixed flames. The results show the expediency of the technique in the study of the reaction zone and reveals interesting findings about the indium atomization process. Indium fluorescence is observed to be strongest at the flame-front, where the temperature exceeds 1000 K. The uncertainty in the deduced temperature measurement is ∼6%. The temperature profile across the reaction zone shows good agreement with laminar flame calculations. The advantages and inherent limitations of the technique are discussed.
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 2017
Publisher: SAGE Publications
Date: 20-09-2018
Abstract: In this article, a generic framework was proposed to effectively characterise the pyrolysis kinetics of any household furniture materials. To examine the validity of this method, two wooden polymeric s les, (1) furniture plywood and (2) particle board, were experimented through thermogravimetric and differential thermal analyses, as well as cone calorimetry. The framework comprises of three major parameterisation procedures including (1) using the Kissinger method for the initial approximation, (2) modification of modelling constants and (3) optimisation by comparisons with the experimental results. The finalised pyrolysis kinetics was numerically investigated through computational fluid dynamics simulation of the cone calorimeter. Numerical predictions were validated against the experimental data for three different cone radiation intensities. Good agreement was achieved between the computational and experimental results in terms of heat release rate, ignition time and burn duration. The proposed framework was capable of establishing quality pyrolysis kinetics that fully replicates the complex thermal decomposition of solid combustible materials.
Publisher: Optica Publishing Group
Date: 20-02-2009
DOI: 10.1364/AO.48.001237
Abstract: This work aims to advance understanding of the coupling between temperature and soot. The ability to image temperature using the two-line atomic fluorescence (TLAF) technique is demonstrated. Previous TLAF theory is extended from linear excitation into the nonlinear fluence regime. Nonlinear regime two-line atomic fluorescence (NTLAF) provides superior signal and reduces single-shot uncertainty from 250 K for conventional TLAF down to 100 K. NTLAF is shown to resolve the temperature profile across the stoichiometric envelope for hydrogen, ethylene, and natural gas flames, with deviation from thermocouple measurements not exceeding 100 K, and typically ≲30 K. Measurements in flames containing soot demonstrate good capacity of NTLAF to exclude interferences that h er most two-dimensional thermometry techniques.
Publisher: Springer Science and Business Media LLC
Date: 25-05-2012
Publisher: Informa UK Limited
Date: 27-01-2021
Publisher: American Chemical Society (ACS)
Date: 20-12-2023
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 07-2018
Publisher: American Chemical Society (ACS)
Date: 10-04-2018
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 2011
Publisher: SAE International
Date: 28-03-2017
DOI: 10.4271/2017-01-0657
Publisher: American Chemical Society (ACS)
Date: 04-08-2018
DOI: 10.1021/ACS.LANGMUIR.8B01457
Abstract: Gold nanoparticle (GNP) aggregation has a strong influence on the plasmonic resonance and hence the effectiveness in various photothermal applications. In relation to this, a comprehensive numerical model is developed to simulate and characterize the GNP aggregation process at various particle volume fractions and base fluid pH levels. Computational fluid dynamics techniques are utilized to model the base fluid, whereas discrete phase modeling is adopted in determining the nanoparticle trajectories. Two-way coupling is implemented to handle the particle-fluid interactions. Discrete dipole approximation approach is utilized to further examine the absorption and scattering efficiency of various GNP aggregate structures. At lower particle volume fraction, short chain-like structures are formed in the particle aggregation process, with a more complex interconnected "particle network" structure formed at higher particle volume fractions. With the three base fluid pH levels investigated, GNP aggregates are more compact with larger fractal dimensions and higher mean coordination numbers at pH = 3.5, whereas a more "loose" structure formed at pH = 6.7 and 9.4 because of larger electrostatic repulsive forces as a result of changes in the zeta potential and Debye length of the GNPs. Among the typical GNP aggregate structures characterized in this paper, the chain-like tetramer demonstrates the highest absorption efficiency of 1.83 at 700 nm wavelength-comparable to the plasmonic resonance of a nanorod-which lies in the optical window of biological tissue. Predictions of GNP optical properties are found to be in good agreement with the published experimental data.
Publisher: Elsevier BV
Date: 2018
Publisher: SAE International
Date: 17-10-2016
DOI: 10.4271/2016-01-2303
Publisher: Elsevier BV
Date: 07-2013
Publisher: SAE International
Date: 09-2015
DOI: 10.4271/2015-01-1991
Publisher: Springer Science and Business Media LLC
Date: 16-04-2011
Publisher: Elsevier BV
Date: 04-2019
Publisher: Springer Science and Business Media LLC
Date: 28-01-2019
Publisher: American Chemical Society (ACS)
Date: 02-10-2019
Abstract: Polyimide (PI) aerogels have attracted great attention owing to their low density and excellent thermal stability. However, hydrophobic surface modification is required for PI aerogels to improve their ability in oil/water separation due to their hiphilic characteristic. Two-dimensional MXenes (transition metal carbides/nitrides) can be utilized as nanofillers to enhance the properties of polymers because of their unique layered structure and versatile interface chemistry. Herein, the robust, lightweight, and hydrophobic PI/MXene three-dimensional architectures were fabricated via freeze-drying of polyamide acid/MXene suspensions and thermal imidization. Polyamide acid was synthesized using
Publisher: Elsevier BV
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 05-01-2018
Publisher: Springer Science and Business Media LLC
Date: 25-09-2014
Publisher: SAE International
Date: 28-03-2017
DOI: 10.4271/2017-01-0742
Publisher: Elsevier BV
Date: 12-2019
Publisher: American Chemical Society (ACS)
Date: 09-07-2018
Publisher: SAE International
Date: 03-04-2018
DOI: 10.4271/2018-01-0246
No related grants have been discovered for Shaun Chan.