Residence time distribution of a model hydrodynamic vortex separator

Study of Flow Pattern in Jet Clarifier for Removal of Turbidity by Residence Time Distribution Approach

“…Although other analysis methods are available, the compartment model and the dispersion model were chosen due to their simplicity and applicability [16]. The method of moments and non-ideal device techniques were used to calculate the parameters from the experimental data, including mean residence time (tm), variance ( 2 ), exact variance ( 2  ) and flow model parameter [17,18]. The tracer (NaCl) pulse input data are presented using the exit-age distribution function E(t) which is defined as the fraction of material which has left the device between time t and t+dt.…”

Residence time study of a hydrodynamic vortex separator applied to predicting disinfection performance

“…Thus, this work relies heavily on the kinetic rate constants determined by Pretorius and Pretorius [4] and equation (2), which was validated by Pretorius and Pretorius, [4] for a continuous flow of wastewater.…”

“…Figure 9 shows contours of micro-organism survival at an inlet flowrate of 0.187 m 3 /s with an apparent kinetic rate constant of 0.0129 s −1 at a pH7. This figure has been plotted using equation (14) to determine the mean residence time throughout the separator and equation (2) applied to predict the survival of microorganisms. It is assumed that the mean residence time, divided by four, for each cell within the CFD model can be used in equation (2) in place of τ to predict the survival in the respective cell.…”

“…This figure has been plotted using equation (14) to determine the mean residence time throughout the separator and equation (2) applied to predict the survival of microorganisms. It is assumed that the mean residence time, divided by four, for each cell within the CFD model can be used in equation (2) in place of τ to predict the survival in the respective cell. It is clear that there is a higher survival in the outer regions of the HDVS where the fluid has a relatively short residence time after entering through the inlet.…”

Simulation of continuous boric acid slurry reactors in series by microfluid and macrofluid models

“…These different techniques require the use of different experimental set-ups and various types of particles and liquid media [9]. Many investigations have been performed by using tracer [10][11][12][13]. The axial dispersion model [11], the tanks in series model [14] or their combination [13] have been used to describe the continuous flow processes in particulate systems.…”