Abstract
NETmix is a static mixing reactor composed of a network of mixing chambers interconnected by channels. The repetitive mixing pattern inside the reactor enables the use of reduced geometries to represent the NETmix network, such as the ExtendedNUB model, used in this work. Mixing in NETmix is based on the impingement of jets, issuing from channels. Inside the chambers, the jets are engulfed by dynamic vortices which can be quantified using Lagrangian techniques. Batch Lagrangian Mixing Simulation (BLMS) is based on successive injections of particles to measure the fraction of the fluids at the outlet of the mixing chambers. The distribution of the outlet fraction of particles indicates that it is possible to have nearly perfect mixing inside the NETmix chambers, depending on the dimensions of the channels and chambers. The NETmix design is here optimized in relation to the chamber diameter to channel width ratio, D/d. Results from BLMS show that best performance in NETmix occurs for 6.65≤D/d≤6.85.
Highlights
NETmix is a static mixer patented in 2005 (Lopes et al, 2005)
The NETmix reactor enables the control of macro and micro-mixing which can be manipulated to improve the performance of the reactor (Laranjeira et al, 2009)
Lagrangian methods will be used to track the injected fluids from the inlet to the outlet of one chamber. This algorithm will be used to optimise the NETmix network topology in terms of the ratio chamber diameter/channel width, D/d, which is expected to have a major influence on the mixing capacity of the NETmix reactor
Summary
NETmix is a static mixer patented in 2005 (Lopes et al, 2005). The design of the reactor is based on a network of mixing chambers interconnected by transport channels (Lopes et al, 2005). Lagrangian methods will be used to track the injected fluids from the inlet to the outlet of one chamber This algorithm will be used to optimise the NETmix network topology in terms of the ratio chamber diameter/channel width, D/d, which is expected to have a major influence on the mixing capacity of the NETmix reactor. The first 5 s correspond to the injection of Fluid, which starts to occupy the reactor already filled with Fluid1 It takes just 6 s to have nearly perfect mixing inside the NETmix reactor, the oscillatory behaviour takes about 10 s to completely develop, as shown in Figure 13 (right) where only from 10 s, the amplitude and frequency of the flow oscillations become constant. The similarity of the values between BLMS and the tracer simulation shows that the injection of particles is a good method to evaluate the performance of this type of reactor
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