Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Power number"”.
-
Power dissipation and power correlations for a retreatblade impeller under different baffling conditions
… impeller clearance from the vessel bottom. The power, P, dissipated by the impeller is a critical process parameter to mixing processes to achieve the desired mixing effect, especially since the power per unit volume, P/V, directly controls mass transfer processes and other mixing phenomena. …
-
Flow patterns and energy dissipation rates in batch rotor-stator mixers
… tended to move radially as free jets. The power number correlated well with the total flowrate and the total flowrate correlated well with the total hole area. Both power number and flowrate were practically not affected by hole shape, hole spacing and stator thickness. For all stators …
-
Single and multiphase mixing in partially filled stirred vessels
… hydrodynamics and related mixing phenomena. A number of experimental tools were used to analyze the systems under investigation, including: Particle Image Velocimetry (PIV) for the experimental determination of the velocity profiles, and after the appropriate data manipulation, the impeller …
-
Modeling and Simulation of Large Scale Stirred Tank
… evaluate the structure of the flow field and the power demand of the agitator. The results from the numerical models were compared with empirical data collected from these pilot plants that had been operated at an earlier date.</p><p>Mixing is commonly used in a variety ways throughout industry to …
-
The effects of tank size and impeller type on turbulent flocculation
… represents the dimensionless impeller power number. $\rm N\sb{p}\ \sp{0.5}$ND represents the magnitude of the rms fluctuating velocity in a region where the turbulent flow is anisotropic. These turbulence results suggest that G$\rm\sb{m}$ does not adequately describe the turbulence …
-
Effects of operating and geometric variables on hydrodynamics and tablet dissolution in standard and modified dissolution testing apparatuses 2
… attention, such as the determination of its power dissipation requirements (which controls solid-liquid mass transfer processes) and the velocity distribution under the different agitation conditions at which this system is routinely operated. In addition, the tablet dissolution performance …
-
Static Mixing Spacers for Spiral Wound Modules
… empty channel and results in terms of Sherwood number, Power number and friction factor. Future works are proposed to have a better comparison for experimental and simulation results.
-
Hydrodynamic CFD modeling of a pharmaceutical reactor vessel provided with a retreat-blade impeller under different baffling conditions
… CFD simulations result in the prediction of the power dissipated by the impeller and therefore the impeller Power Number. These predictions are then compared with the experimental results obtained in previous work by this group. In the fully baffled system, the values of the Power Numbers …
-
Power dissipation and mixing time in a partially filled pharmaceutical reactor equipped with a retreat-blade impeller at different fill ratios
… reactor have not been fully studied, such as the power dissipated by the impeller under different baffling conditions and blend time, i.e., the time required by a system to achieve a predetermined level of homogeneity. Therefore, this work was focused on the determination of the impeller power …
-
Agitation, mixing and mass transfer in simulated high viscosity fermentation broths
Gas-liquid mass transfer, agitator power consumption, rheology, gas-liquid mixing and gas hold-up have been studied in an agitated, sparged vessel of diameter, T = 0.3 m, with a liquid capacity of 0.02 m\(^3\), unaerated liquid height = 0.3 m. The solutions of sodium carboxymethylcellulose used …