Determination of the mixing performance of sulzer SMV static mixers by laser induced fluorescence

Abstract

Local concentrations are measured at the outlet of different configurations of Sulzer SMV static mixers placed in a tube. Laser Induced Fluorescence is the non intrusive technique used to measure mean and RMS concentrations. The two fluids mixed are miscible and the flow regime is turbulent. The influence of the number of elements, their position and the ratio between the velocities of the two compounds on the mixing is studied. The results show that these parameters are important for the quality of mixing. The velocity ratio influences the radial mixing, while the mixing length depends on the number and position of the elements.

Using electrical resistance tomography (ERT) and computational fluid dynamics (CFD) to study the mixing of yield-pseudoplastic fluids in the SMX static mixer

“…When the viscocity of the primary fluid decreased due to the intensity of shearing by the high velocity secondary fluid, the resistance to flow of the primary fluid become lessened and hence, the SMX static mixer was able to disperse the Newtonian secondary stream (Water) more effectively into the shear thinning primary fluid, where the viscosity was relatively lessened compared to the bulk primary fluid. In parallel to the observation reported for Sulzer SMV static mixer in turbulent flow regime, the SMX static mixer also depends on this secondary/primary velocity ratio to influence the radial mixing even though our flow regime is laminar (Karoui et al,1998). Mass fraction of water (%)…”

“…The interface of striations is determined if there are more than 20 units that have different pixel intensities from the neighboring particles of the point of analysis. Again, in 1998, the laser induced fluorescence (LIF) was employed to calculate the concentration variance by translating the fluorescence signal in voltage to the concentration of fluorescence dye, which has direct proportionality (Karoui et al, 1998). The driving force for the reduction in striation thickness could be inferred through the analysis of interfacial area of clumps or the striations and the concentration gradient of the dye or additive tracer.…”

“…The effect of the viscosity ratio between the secondary and the primary fluids on the mixing of these two miscible fluids was studied on the SMX static mixer and the occurrence of the viscous fingering phenomena was reported for the mixing of two miscible fluids with higher viscosity ratio (Ventresca et al, 2002;Cao et al, 2003). Karoui et al (1998) studied that the higher secondary/primary stream velocity ratio increased the mixing quality of two miscible fluids in the Sulzer SMV static mixer operated under the turbulent flow regime. This research study involved the mixing of a dyed aqueous solution of rhodamine B in water.…”

Flow analysis by pulsed ultrasonic velocimetry technique in Sulzer SMX static mixer

“…[9], friction factor by polarographic techniques Morançais et al [10] and Hirech et al [11] are reported. A good review of flow through static mixer was done by Thakur et al [3].…”

Blending of miscible liquids with different densities and viscosities in static mixers

“…Recently, Coroneo et al (2012) have evaluated the capability of RANS simulations in predicting the main fluid dynamic characteristics in a pipeline equipped with an SMV static mixer element. The validation of the CFD model was performed by the comparison of the simulations' results with literature LDA mean velocity profiles (Karoui et al, 1997) and LIF tracer concentration data (Karoui et al, 1998).…”