https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:17143 Wed 11 Apr 2018 15:39:34 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:13399 Wed 11 Apr 2018 12:39:57 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32954 f₁, has been proposed (see for example Joshi et al. (2001)). Briefly, the LSA analysis utilises the velocity fluctuations of both the dispersed and continuous phases associated with the specific energy dissipation rate of the two phase mixture. Typically, the specific energy dissipation rate is correlated with the density of the bed. The previous analysis, however, does not consider the energy input which associated with the turbulence intensity (velocity fluctuations) of the incoming liquid stream. Usually, this component can be ignored in sparged bubble columns because its magnitude is relatively small and it also decays in the axial direction. In plunging liquid jet bubble columns the liquid is introduced as a high speed jet that entrains gas which is then broken into fine bubbles in the Mixing Zone. The bubby mixture then passes into the Two Phase Flow Zone where instabilities can be generated. The Mixing Zone is a region of high energy dissipation resulting in relatively large liquid velocity fluctuations, which can directly influence the instability of the Two Phase Flow Zone. In this study the existing linear stability analysis is modified to include the influence of inlet liquid velocity fluctuations on the stability parameter, f₁. The modified theory is applied to the previous work of Evans (1990) for a plunging liquid jet bubble column to determine the critical gas volume fraction at which transition takes place in the Two Phase Flow Zone. In order to apply the model, drift-flux analysis has been used to obtain bubble diameter as a function of gas and liquid superficial velocities, and computational fluid dynamics has been utilised to quantify the velocity fluctuations of the liquid exiting the Mixing Zone.]]> Thu 16 Aug 2018 13:36:04 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43290 Thu 15 Sep 2022 12:44:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:13556 Sat 24 Mar 2018 08:17:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20915 Sat 24 Mar 2018 08:06:12 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27090 Sat 24 Mar 2018 07:40:35 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:28747 d_PD=5–12 mm) and single air bubbles (d_B=1–4 mm) has been measured in a solid–liquid fluidized bed of uniform size borosilicate glass beads (d_P=5 and 8 mm) as a function of liquid superficial velocity. The homogeneity and intensity of the turbulence within the fluidized bed has been quantified and directly related to the slip velocity of the foreign (steel or bubble) particle. It was found that the turbulence resulted in an increase in the computed drag coefficient for all of the experimental conditions investigated.]]> Sat 24 Mar 2018 07:37:35 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30864 Sat 24 Mar 2018 07:26:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26571 Sat 24 Mar 2018 07:26:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35376 Mon 22 Jul 2019 13:16:44 AEST ]]>