ORCID Profile
0000-0002-4319-7849
Current Organisation
Macquarie University
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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.
Manufacturing Engineering | Nonlinear Optics and Spectroscopy | Manufacturing Processes and Technologies (excl. Textiles) | Metals and Alloy Materials
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Engineering | Metals (e.g. Composites, Coatings, Bonding) |
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 03-2022
Publisher: Informa UK Limited
Date: 12-12-2019
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 09-2022
Publisher: SAE International
Date: 05-04-2016
DOI: 10.4271/2016-01-0859
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 04-2020
Publisher: MDPI AG
Date: 05-05-2023
DOI: 10.3390/CLEANTECHNOL5020030
Abstract: Air conditioning and refrigeration have become necessary in modern life, accounting for more than 7.8% of greenhouse gases (GHG) emitted globally. Reducing the environmental impact of these systems is crucial for meeting the global GHG emission targets. Two principal directions must be considered to reduce the environmental impact of air conditioning systems. Firstly, reducing the direct effect by looking at less harmful refrigerants and secondly, reducing the indirect effect by searching for options to improve the system efficiency. This study presents the latest developments in the vapor compression cycle and natural refrigerants, focusing on water as a refrigerant. Natural refrigerants, and especially water, could be the ultimate solution for the environmental problems associated with the operation of vapor compression cycle (VCC) cooling systems, including ozone depletion (OD) and global warming (GW). Reducing the environmental impact of building cooling systems is essential, and the recent system improvements made to enhance the system coefficient of performance (COP) are thoroughly discussed in this paper. Though the cycle improvements discussed in this work are essential and could increase the system efficiency, they still need to solve the direct environmental impact of refrigerants. Accordingly, this paper suggests that natural refrigerants, including water, are the most suitable strategic choice to replace the current refrigerants in the refrigeration and air conditioning industry. Finally, this study reviews the latest VCC system improvements and natural refrigerants in order to guide interested researchers with solutions that may reduce the environmental impact of VCC systems and suggest future research areas.
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 06-2021
Publisher: Cambridge University Press (CUP)
Date: 17-10-2017
DOI: 10.1017/JFM.2017.653
Abstract: This paper presents a probability density function (PDF) form of the population balance equation (PBE) for polysized and polyshaped droplets and solid particles in turbulent flows. A key contribution of this paper lies in the inclusion of an explicit consideration of the inertial effects and the shape of particles in the PDF-PBE formulation. The number density is taken as a function of droplet or particle size (volume) and shape as well as space and time. Potentially, other particle properties could also be included in the formulation. Inertial effects are quantified through the Stokes number, leading to accurate modelling of the different trajectories that are followed by droplets and/or particles with different sizes and shapes. To treat these effects, a new affordable approach is proposed and referred to as the method of Stokes binning. Here, the inertial dispersed elements are accelerated due to fluid dynamic forces associated with an averaged Stokes number in each bin. The model is validated against two data sets. The first data set includes a series of numerical test cases involving the injection of polyshaped droplets ranging in size from 1 to 50 $\\unicode[STIX]{x03BC}\\text{m}$ into a turbulent jet resulting in inlet Stokes numbers ranging from 0.03 to 75.2. The second data set consists of an experimental case focusing on the dispersion of 60 and 90 $\\unicode[STIX]{x03BC}\\text{m}$ spherical droplets in a turbulent round jet, resulting in inlet Stokes numbers of 53 and 122, respectively. The results confirm the ability of the approach to accurately model the polysized and polyshaped droplet dispersion using as few as eight Stokes bins. This approach has the potential to greatly reduce the computational cost of modelling the evolution of inertial droplets and particles in turbulent flows.
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 07-2023
Publisher: Informa UK Limited
Date: 11-07-2022
Publisher: MDPI AG
Date: 20-10-2023
Publisher: Elsevier BV
Date: 04-2022
Publisher: Springer Science and Business Media LLC
Date: 05-04-2023
Publisher: AIP Publishing
Date: 07-2023
DOI: 10.1063/5.0157464
Abstract: A computational study is conducted to analyze the effects of an upstream gust impulse on lock-on flow of a cylinder, which is rotationally oscillating. Reynold numbers of 100, 110, and 120 and three discrete oscillation conditions based on rotational oscillation litudes are considered. The current solution scheme is validated for the cases of stationary and rotationally oscillating cylinders in a uniform flow. The oscillation Strouhal forcing frequency is varied with a resolution of 0.0001 for lock-on to quasi-periodic flow boundary identification. Flows are categorized as either lock-on or quasi-periodic based on frequency analysis of lift. Furthermore, three different gust impulses for each Reynolds number are selected by associating gust Strouhal frequency to natural shedding Strouhal frequency, whereas the Prandtl number is 7. These gust impulses were introduced in lock-on flow near lock-on to quasi-periodic flow boundary. Analysis of lift, drag, and vorticity contours confirms that the lock-on flow is transformed into quasi-periodic flow in conditions of high oscillation litude and low gust frequency. This transformation is observed to persist for four descending values of rotational oscillation Strouhal forcing frequency at the upper lock-on boundary.
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 03-2022
Publisher: Springer Science and Business Media LLC
Date: 19-11-2020
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 08-2020
Publisher: Wiley
Date: 30-03-2023
Publisher: Elsevier BV
Date: 08-2023
Publisher: ASME International
Date: 13-01-2022
DOI: 10.1115/1.4053171
Abstract: This paper presents a systematic analysis of the thermodynamic performance of spiral turns in spiral plate heat exchangers (SPHEs), including non-adiabatic sources such as effects of heat leakage to the environment and fluid friction. These sources can reduce the thermal performance and increase the irreversibility of SPHEs. First, the critical factors of the heat loss rate to the environment, internal heat transfer rate (HTR), and channel temperature distributions are specified based on modeling the SPHE with hypothetical heat exchanger networks. Also, this modeling is validated with the results of channel temperature distributions by computational fluid dynamics simulation. Second, besides examining the spiral turns by entropy generation methods, entransy-based parameters are developed to analyze the SPHEs based on generated heat due to fluid viscosity in their channels for the first time. Finally, to show the method applicability proposed, an optimal designed single-phase counter-current SPHE is explored as a case. Three scenarios are introduced to evaluate the performance and irreversibility, namely heat leakage and no heat leakage to the environment and transferring the net heat between the streams. Results highlight the effects of non-adiabatic conditions, such as reductions of around 5.46%, 2.25%, and 2.42%, respectively, in the heat transfer area, total HTR, and overall heat transfer coefficient. Furthermore, findings confirm the performance reductions and irreversibility increments in non-adiabatic conditions and assert the importance of covering the outermost channels appropriately.
Publisher: Springer Science and Business Media LLC
Date: 18-12-2019
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 06-2023
Publisher: MDPI AG
Date: 26-10-2022
Abstract: Attention to photovoltaic (PV) cells to convert solar irradiation into electricity is significantly growing for domestic usage and large-scale projects such as solar farms. However, PV efficiency decreases on hot days. This paper proposes an effective cooling technique consisting of a 2% nano encapsulated phase change material (NEPCM) slurry and impinging jets (IJs) in a PV system. The impact of five influencing parameters on PV efficiency is studied using a multi-phase volume of fluid (VOF) model encompassing the effects of solar irradiation, latent heat, mass flow rate, number of nozzles, and jet-to-surface distance. The maximum efficiency of 15.82% is achieved under irradiation of 600 W/m2. The latent heat shows a slight improvement at the low particle concentration. Increasing the mass flow rate to 0.12 kg/s enhances the PV output power by 17.32%. While the PV performance is shown to be improved over the increment of the number of nozzles, the jet-to-surface spacing of 5.1 mm records a remarkable PV surface temperature reduction to 33.8 °C, which is the ideal operating temperature for the PV panel.
Publisher: Springer Science and Business Media LLC
Date: 07-2021
Publisher: Informa UK Limited
Date: 03-07-2022
Publisher: Springer International Publishing
Date: 2022
Publisher: Springer Singapore
Date: 2020
Publisher: Informa UK Limited
Date: 03-12-0009
Publisher: Elsevier BV
Date: 08-2020
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Publisher: Elsevier BV
Date: 2019
Publisher: Elsevier BV
Date: 12-2023
Publisher: Springer International Publishing
Date: 2022
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 08-2021
Publisher: SAE International
Date: 03-02-2021
Publisher: Springer Science and Business Media LLC
Date: 14-06-2019
Publisher: Elsevier BV
Date: 02-2022
Publisher: MDPI AG
Date: 12-01-2023
DOI: 10.3390/FIRE6010029
Abstract: Hydrogen fuel cell vehicle (HFCV) technology poses great promise as an alternative to significantly reduce the environmental impact of the transport sector’s emissions. However, hydrogen fuel cell technology is relatively new, therefore, confirmation of the reliability and safety analysis is still required, particularly for fire scenarios within confined spaces such as tunnels. This study applied the computational fluid dynamics (CFD) simulations in conjunction with probabilistic calculation methods to determine the associated thermal risk of a hydrogen jet fire in a tunnel and its dependency on scenarios with different tunnel slopes, longitudinal and transverse ventilation velocities, and fire positions. A large-scale model of 102 m in which the effects of outlined parameter variations on the severity of the fire incident were analysed. It is found that both tunnel ventilation techniques and slope were critical for the effective ejection of accumulated heat. With ventilation playing a primary role in the ejection of heat and gas and slope ensuring the stability of the ejected heat, probabilities of thermal burns were found to be reduced by up to approximately 35% with a strong suggestion of critical combinations to further reduce the dangers of hydrogen tunnel fires.
Publisher: AIP Publishing
Date: 09-2021
DOI: 10.1063/5.0059779
Abstract: Studies on pressure-swirl atomizers have mainly focused on pressure-swirl atomizers with tangential input while there are limited studies on pressure-swirl atomizers with a spiral path. This study applies experimental and computational methods to provide a better understanding of flow development in this type of atomizer at the design point and outside the design point. Experimental results showed that as the pressure increases, the spray cone angle increases. This increase initially occurs with a higher slope and then the slope is toned down. While the drainage coefficient remains constant, the droplet diameter decreases as the pressure increases. It is observed that similar to the pressure-swirl atomizer with tangential input, the pressure-swirl atomizer with a spiral path has a conical hollow spray. At the constant mass flow rate, as the spiral path cross-section, the length of the swirl chamber and orifice diameter increase, the fluid film thickness and average diameter of droplets increase while the spray cone angle reduces. Further, increasing the number of spiral paths causes a wider spray cone angle, higher discharge coefficient, larger fluid film thickness, and larger droplet diameter. The results also showed that increasing the length of the orifice marginally affected the properties of the spray while significantly reducing the spray cone angle. It is important to note that the numerical results are in good agreement with the experimental data.
Publisher: Elsevier BV
Date: 2020
Publisher: Springer Science and Business Media LLC
Date: 07-2021
Publisher: Springer Science and Business Media LLC
Date: 07-01-2021
Publisher: Informa UK Limited
Date: 24-06-2023
Publisher: Springer Science and Business Media LLC
Date: 21-04-2015
Publisher: Springer International Publishing
Date: 2022
Publisher: Elsevier BV
Date: 04-2022
Publisher: Elsevier BV
Date: 08-2018
Publisher: Informa UK Limited
Date: 09-03-2021
Publisher: Elsevier BV
Date: 2023
Start Date: 08-2022
End Date: 07-2023
Amount: $320,000.00
Funder: Australian Research Council
View Funded Activity