https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54559 Wed 28 Feb 2024 10:25:37 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:44647 Wed 19 Oct 2022 08:46:30 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34791 Wed 16 Sep 2020 09:18:35 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47153 i^/) were determined in a solid-liquid fluidised bed comprising glass particles (d_S = 8 mm, ρ_S = 2230 kg m⁻³) and water as a fluidising medium. Both inter-particle and particle-wall collisions were determined from the time varying jerk data. The particle mean-free path (λ) was then estimated as a distance between two successive peaks in the jerk profile. Finally, dispersion efficient D was computed based on the product of λ and V. Estimated dispersion coefficients were compared with the available correlations and reasonable agreement was obtained.]]> Wed 14 Dec 2022 15:34:32 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:13399 Wed 11 Apr 2018 12:39:57 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12370 Wed 11 Apr 2018 11:10:22 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:13398 Wed 11 Apr 2018 10:18:08 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49302 100°C), and sintered bed. The sintering experiments were conducted in a lab-scale milli-pot (diameter 53 mm, height 500 mm) fitted with six taps and transient variations of pressure-drop in different zones were analysed. The resistance was quantified for the three zones by correlating pressure gradient in each zone (ΔP/L) with the specific kinetic energy of air (v2) during sintering. The high temperature zone was further divided into two sub-zones i.e. pre-melt reaction zone (PMRZ) and granule melting zone. The PMRZ was responsible for the highest pressure gradient in the bed during sintering due to the changes in bed structure and the much greater gas volumetric flow rate due to the high gas temperature. The PMRZ included various physico-chemical processes and it was observed that the resistance in the PMRZ was high at a high suction value across the bed. High productivity was observed for a high suction pressure. The sinter yield was influenced by holding time over 1200°C and an exponential growth function was proposed to estimate the sinter yield.]]> Wed 10 May 2023 16:57:16 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55091 Wed 10 Apr 2024 08:37:48 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:34085 Wed 06 Feb 2019 16:16:37 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26042 Wed 04 Sep 2019 12:17:30 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47341 Tue 25 Jun 2024 12:38:15 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51070 Tue 25 Jun 2024 10:53:00 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40303 Tue 25 Jun 2024 10:33:49 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54389 Tue 20 Feb 2024 20:46:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22986 Tue 20 Aug 2024 11:16:15 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40818 Tue 19 Jul 2022 09:37:21 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37703 Tue 16 Mar 2021 18:12:51 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46033 Tue 12 Mar 2024 18:50:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55640 Tue 11 Jun 2024 18:51:14 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55642 Tue 11 Jun 2024 18:50:56 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46747 Tue 09 Jan 2024 11:43:13 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26049 Tue 07 Feb 2017 09:23:41 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42883 Tue 06 Sep 2022 11:51:29 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40218 Tue 06 Aug 2024 12:56:26 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51444 Tue 05 Sep 2023 17:53:44 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40634 Tue 05 Sep 2023 15:13:06 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50672 Tue 01 Aug 2023 14:44:49 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45343 Thu 27 Oct 2022 10:29:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32959 Thu 16 Aug 2018 13:36:14 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32957 -5 to 5 × 10^-4 m2 s^-1 when energy dissipation rate increased from ~ 0.005-0.01 m² s^-3. Different dispersion correlations were then utilized to describe the intermixing and segregation behaviour for the binary particle species differing in density in terms of axial particle concentration profile using a one-dimensional convection-diffusion model which agreed well with the experimental data. Additionally, a two-dimensional (2D) Eulerian-Eulerian (E-E) model based on kinetic theory of granular flow (KTGF) was used to simulate axial variation of the binary solids concentration which showed good agreement (~ 10% deviation) with the published experimental data. Axial profile of dispersion coefficient predicted by the various correlations exhibited a sharp variation in the intermixing zone formed in between the lower (higher density) and upper particle bed (low density). In this region, CFD model predicted energy dissipation rate increased significantly with liquid superficial velocity which reflected strong phase interactions in the intermixing zone.]]> Thu 16 Aug 2018 13:36:10 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43290 Thu 15 Sep 2022 12:44:32 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39461 2S–C₃P) during the solidification of basic oxygen steelmaking (BOS) slag. Typically, C₂S–C₃P solidifies first and has a lower density than the remaining liquid slag, suggesting that gravity separation may be possible. This study simulated the cooling behaviour of BOS slag, and predicted the potential for spherical C₂S–C₃P particles to float. A lumped parameter heat transfer model based on ordinary differential equations was developed to predict the temporal variations of slag temperature in a 5 mm diameter Pt crucible. Hydrodynamic calculations were also carried out to study the floating behaviour of the spherical particles. The results showed reasonable agreement between predictions and experimental measurements for the slag’s cooling rate. In the separation experiments, coarse C₂S–C₃P crystals were observed in the upper section of the crucible, while a glassy slag was observed in the lower section. This is consistent with the hydrodynamic calculations that showed the single particles floating up to the interface. Preliminary approximations were also performed for industrial slag pots which showed the higher possibility of separation for a shallow and insulated slag pot. Further studies are required to confirm the nucleation and growth behaviour in the experiments.]]> Thu 09 Jun 2022 09:15:21 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42714 Thu 01 Sep 2022 11:33:33 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36784 Sun 11 Apr 2021 16:19:59 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19539 Sat 24 Mar 2018 08:02:05 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:20753 Sat 24 Mar 2018 08:00:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27090 Sat 24 Mar 2018 07:40:35 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27407 Sat 24 Mar 2018 07:34:08 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:28936 Sat 24 Mar 2018 07:31:27 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26045 Sat 24 Mar 2018 07:26:27 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26046 Sat 24 Mar 2018 07:26:26 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26729 Sat 24 Mar 2018 07:26:18 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26571 Sat 24 Mar 2018 07:26:11 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:26549 Sat 24 Mar 2018 07:26:08 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25528 -3) were used as fluidised particles. Three different combinations of particle size pairs of both equal and unequal mass ratios were used using a constant liquid (water) superficial velocity of 0.17 ms^-1 in all the cases. Numerically, a two dimensional Eulerian-Eulerian (E-E) CFD model incorporating kinetic theory of granular flow (KTGF) was developed to predict the bed expansion behaviour. It was observed that complete bed segregation occurred when the difference between the solid particle diameters was higher while lower difference in particle diameters led to partial bed segregation. The CFD model also predicted these behaviours which were in good agreement with the experimental data.]]> Sat 24 Mar 2018 07:26:07 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25529 -3 were fluidised in water. Binary experiments were carried out considering both equal and unequal solid mass ratios ranging from 0.16 to 6.0. The overall bed expansions including segregated and intermixed zones were monitored. The effect of loading pattern on bed expansion was found insignificant in a binary SLFB. In a completely segregated SLFB, bottom mono-component layer displayed a negative deviation up to 30% whereas a positive deviation up to 22% was found in top mono-component layer when compared to respective individual monocomponent SLFBs. The total bed height of binary mixture was found to be unequal to sum of expanded bed height in individual mono-component SLFB, showing either positive or negative deviations. The experimentally observed criterion of the bed independency has been tabulated. Eulerian-Eulerian (E-E) CFD simulations with kinetic theory of granular flow (KTGF) have been performed and compared with the experimental data. The CFD predictions were found to be in good agreement (within ±6 per cent deviation) when compared to experimental results.]]> Sat 24 Mar 2018 07:26:07 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24474 Sat 24 Mar 2018 07:17:26 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25145 Sat 24 Mar 2018 07:17:10 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23747 Sat 24 Mar 2018 07:16:57 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24847 Sat 24 Mar 2018 07:11:24 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25043 Sat 24 Mar 2018 07:10:43 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24063 Sat 24 Mar 2018 07:09:41 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32956 -3) spherical glass beads particles of diameter 3, 5 and 8 mm and water as fluidising medium with different particle mass ratios varying from 0.17 to 6.0. In the expanded bed, both segregated and intermixed zones were observed depending on the different particle diameter combinations. In a completely segregated SLFB, the bottom monosized layer exhibited a negative deviation ~23% whereas a positive deviation ~25% was found in the top monosized layer when compared with the corresponding pure monosized system. A small mixing zone spanning approximately two particle diameters thick was observed to exist even in a completely segregated SLFB for higher diameter ratio cases. A slight decrease in the mixing zone height was noted with increasing liquid superficial velocity. For lower diameter ratio cases, a relatively lager mixing zone height was observed which increased with increasing liquid superficial velocity. The bed expansion ratio was noted to decrease with increasing solid mass ratio however it increased with increase in the fluidising velocity ratio following a reasonable power law trend. The expanded bed height of the binary mixture was not entirely additive of its corresponding mono-component bed heights and both positive and negative deviations were observed. Finally, a two-dimensional (2D) Eulerian-Eulerian (E-E) model incorporating the kinetic theory of granular flow (KTGF) was used to quantify the binary system hydrodynamics. The model predicted expanded bed height agreed with experimental measurements within ±6% deviation. Presence of a mixing zone was also confirmed by the CFD model and simulated particle phase volume fraction distribution qualitatively agreed with the experimental visualisations.]]> Sat 06 Jul 2024 14:56:03 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54594 Sat 02 Mar 2024 11:25:56 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:32958 s=150, 160 and 170°) to represent the surface hydrophobicity. CFD model predicted interaction outcomes and droplet spread ratios were in reasonable agreement with the experiment at different impact Weber numbers. Increase in particle surface heat flux and corresponding rise in droplet temperature at different impact Weber numbers were also quantified which showed an increasing trend up to a critical Weber number for droplet disintegration.]]> Mon 23 Sep 2019 13:21:24 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35376 Mon 22 Jul 2019 13:16:44 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39151 K₁ for the overall collision efficiency, was found to be optimum at the lower turbulence intensity of 4%. A maximum bubble surface loading, 0.142 was determined by fitting the model-predicted bubble velocity with available experimental data. With this maximum bubble surface loading constraint, the recovery model predicted two regimes namely a loading regime in the early flotation period and a saturated regime wherein the bubble loading capability was entirely exhausted. Simulation of a batch flotation system suggested that loss in bubble surface loading capacity occurred faster in a dense pulp compared to a dilute pulp system and the predicted recovery decreased with increasing solids concentration for the same gas volume fraction. Similar to the collision efficiency, the optimum recovery was obtained at Ti = 4%. Further, the model predicted recovery was compared to a lab scale coal flotation test and reasonable agreement was obtained.]]> Mon 20 May 2024 14:04:34 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45801 Mon 07 Nov 2022 09:58:02 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36247 Fri 26 Feb 2021 13:23:58 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46601 Fri 25 Nov 2022 15:38:41 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:35930 b = 2.70 and 3.52 mm) rise using the non-intrusive two-dimensional (2D) particle image velocimetry (PIV) at the low Taylor-Reynolds number (Re_λ) ranging from 12 to 60. Using the measured PIV velocity data, the instantaneous pressure fluctuations were estimated by integrating the full viscous form of the Navier-Stokes (N-S) equation and compared with three dimensional (3D) computational fluid dynamics (CFD) simulations. A spectral slope of -7/3 was found in the inertial subrange of the single-phase pressure spectrum. In contrast, the two-phase pressure spectrum exhibited a slope less steep than -7/3 in the inertial subrange because of the extra production of turbulence in the presence of bubble. For single-phase flow, the ratio of pressure integral length scale to the velocity integral length scale (L_p/L) was found to be a constant of about 0.67, and the pressure Taylor microscale (λ_p) was approximately 0.79 ± 0.03 of the velocity Taylor microscale (λ) for a low Reynolds number. The scaling ratio based on the single-phase experimental results were compared with existing theory and DNS results and found to accord well; however, these ratios deviate from theoretical values for two-phase flow. Also, the energy dissipation rate was evaluated based on the pressure spectrum and found the over-predicted (~ 31%) values relative to those calculated from the velocity spectrum.]]> Fri 19 Jun 2020 14:48:42 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:53192 Fri 17 Nov 2023 11:48:55 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39733 Fri 17 Jun 2022 17:59:03 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50921 Fri 11 Aug 2023 14:50:30 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55918 Fri 05 Jul 2024 14:14:10 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40259 1200 °C). To quantify the effect of the different process, sintering experiments were conducted in a milli-pot (diameter 53mm, height 500mm) with relatively high spatial resolution of pressure and temperature measurements. Overall, six taps were fitted in the milli-pot with two taps in the upper half at 100mm distance and four taps were fitted in lower half at 50mm distance for better spatial resolution. It was found that in region of maximum resistance, coke combustion contributed to more than 50% of the pressure drop when compared to other processes. The pressure drop contribution of the coke combustion region increased as the coke addition rate increased.]]> Fri 05 Aug 2022 10:46:50 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49782 Fri 02 Jun 2023 17:28:43 AEST ]]>