“…The governing equations for the geometry under consideration are given by the following models. 4 Parity plot for comparison of the power dissipation predictions between correlation by Arafat et al and CFD for experimental geometry using water. 5 Onset of centrifugal instability: Comparison of CFD predictions with the experimental data of Chandrasekhar, with H = 0.084 m and d = 2.35 mm.…”
Flow between two concentric cylinders, with either or both of them rotating, has potential advantages over
the conventional process equipment. This flow, which is also termed Taylor−Couette flow and exhibits a
variety of flow regimes, has been studied using computational fluid dynamics (CFD) simulations. The onset
of centrifugal instability, the various cell patterns, and the velocity profiles have been predicted and compared
with the available experimental data. To extend the base of experimental information, new measurements
have been made using laser Doppler velocimetry (LDV) and particle image velocimetry (PIV). For the entire
range of experimental data, the Reynolds stress model (RSM) was determined to exhibit good predictive
ability for the mean components of velocity and the turbulent kinetic energy. The wavelengths of the vortices
in various regimes have also been determined using CFD and were observed to be in good conformity with
all the available experimental results. Furthermore, very good agreement between the predicted energy
dissipation rate with the energy input rate was observed over a wide range of speeds and annular gaps.
“…The governing equations for the geometry under consideration are given by the following models. 4 Parity plot for comparison of the power dissipation predictions between correlation by Arafat et al and CFD for experimental geometry using water. 5 Onset of centrifugal instability: Comparison of CFD predictions with the experimental data of Chandrasekhar, with H = 0.084 m and d = 2.35 mm.…”
Flow between two concentric cylinders, with either or both of them rotating, has potential advantages over
the conventional process equipment. This flow, which is also termed Taylor−Couette flow and exhibits a
variety of flow regimes, has been studied using computational fluid dynamics (CFD) simulations. The onset
of centrifugal instability, the various cell patterns, and the velocity profiles have been predicted and compared
with the available experimental data. To extend the base of experimental information, new measurements
have been made using laser Doppler velocimetry (LDV) and particle image velocimetry (PIV). For the entire
range of experimental data, the Reynolds stress model (RSM) was determined to exhibit good predictive
ability for the mean components of velocity and the turbulent kinetic energy. The wavelengths of the vortices
in various regimes have also been determined using CFD and were observed to be in good conformity with
all the available experimental results. Furthermore, very good agreement between the predicted energy
dissipation rate with the energy input rate was observed over a wide range of speeds and annular gaps.
“…Arafat et al [23] calculated the useful work (P) conducted by the rotor in Equation (7). Equation ( 8) could be used to calculate the rotor worked area's volume (V).…”
The geometrical parameters of annular centrifugal contactors (ACCs) have an important influence on the extraction efficiency. The present work used a home-made 25 mm ACC constructed by 3D printing to investigate the effect of five geometrical parameters on the extraction efficiency. These parameters are annular width (d), clearance height (Hc), rotor inlet diameter (Din), bottom vane number (N), and the bottom vane’s bending direction (S). Central composite design was employed to design the experiment, and the response surface methodology was used to analyze the data. The results show that Hc and Din were positive for efficiency, while d and N were negative. When the bottom vane’s bending direction was the same as the liquid helical flow direction, the efficiency improved compared to the straight vane. It is found that 3 mm d, 5 mm Hc, 6 mm Din, and four clockwise covered vanes are the parameters where the efficiency reached the highest point of 94.5%. We analyzed the interactions between the parameters based on the coefficients of the quadratic equation, and the interactions were not considered in previous studies. This work surprisingly reveals that the effects of the parameters on the extraction efficiency were not independent, and there were interactions between the parameters. The interaction between the rotor inlet diameter and annular width was significant and could not be ignored. These results could serve as a reference for optimizing extraction processes and the design of ACCs.
“…However, the solvent extraction process for removing 137 Cs does entrain organic solvent in the decontaminated salt to be treated. 2,3 In general, the idea of stabilizing organic compounds in grouts and cements is thought to be a simple solution to waste disposal. The idea, however, is much more complicated and expensive than simply adding organics to cement and mixing.…”
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