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Meandering mixing channel

Figure 3.17 Two segments of a meandering mixing channel as analyzed by Jiang et al. [66] (bottom) and CFD results showing the projected velocity fields on different cross-sectional planes (middle). The upper part of the figure shows the positions of massless particles after 6 channel segments initially seeded along the material interface. Figure 3.17 Two segments of a meandering mixing channel as analyzed by Jiang et al. [66] (bottom) and CFD results showing the projected velocity fields on different cross-sectional planes (middle). The upper part of the figure shows the positions of massless particles after 6 channel segments initially seeded along the material interface.
Lab-on-a-Chip Devices for Chemical Analysis, Fig. 9 (a) Schematic of experimental setup and (b) microchip layout. The device comprises two inlets, a meandering mixing channel, a detection chamber, and an outlet. The inlets are 400 pm wide, 800 pm deep, and... [Pg.1528]

As an additional example, micromixers with high flow rates are presented where the parallel mixing elements are connected with inlet and outlet manifolds (23]. In Figure 2.7, a micromixer (20 x 20 mm footprint) with 16 parallel mixing elements is shown together with meandering mixing channels and outlet manifold. [Pg.54]

Mixing by Helical Flows in Curved and Meander Micro Channels Most Relevant Citations... [Pg.191]

The sample data presented in this chapter were collected for fairly simple flow conditions. The flow was a unidirectional open-channel flow without large-scale flow meander, and the release condition was isokinetic in the direction of the bulk flow. Thus, chemical filaments were advected by the bulk flow in the stream-wise direction, while turbulent mixing acted to expand the plume size and dilute the chemical concentration. Changes in the flow and release conditions lead to significant variation in the plume characteristics and structure. [Pg.125]

Figure 1.136 Microfluidic mixing elements with Y-type contactor attached to a zig-zag channel having different geometries in the meandering section, (a) s/w = 1 (b) s/w = 2 (c) s/w = 4 (d) s/w = 8 ... Figure 1.136 Microfluidic mixing elements with Y-type contactor attached to a zig-zag channel having different geometries in the meandering section, (a) s/w = 1 (b) s/w = 2 (c) s/w = 4 (d) s/w = 8 ...
The results show that zig-zag channels may have superior mixing performance to geometrically straight channels [59], This increase in performance is gained, however, only at large Re and large ratios of periodic step to width (i.e. moderate meandering). [Pg.186]

Figure 1.137 Mixing efficiency versus the meandering ratio s/w at Pe = 2600 and at two different Re for a set of zig-zag and straight-channel micro mixers. Re = 0.26 (triangles) Re = 267 (circles) [59] w = channel width, L = channel length (by courtesy of ACS). Figure 1.137 Mixing efficiency versus the meandering ratio s/w at Pe = 2600 and at two different Re for a set of zig-zag and straight-channel micro mixers. Re = 0.26 (triangles) Re = 267 (circles) [59] w = channel width, L = channel length (by courtesy of ACS).
M 67] [P 59] The mixing efficiency was derived experimentally in a device with a meandering ratio of 8, i.e. a periodic step of800 pm [59], The channels were 100 pm wide and 48 pm deep with a linear distance of2000 pm. An aqueous buffer solution and a buffer solution with fluorescein were contacted the fluorescence intensity was measured at the end of the channel. Owing to the known problems of biasing... [Pg.188]

Version (b). This design of meander mixer was actually realized. It refers to a structure with a large number of mixing elements which was micro-machined by precision milling in a plastic material [47]. Irreversible sealing of the channel was accomplished by insertion of a thin PMMA foil via solvent bonding. [Pg.192]

Mixer type Meander channel micro mixer Number of mixing elements 20... [Pg.192]

M 70b] [P 63] Photometric concentration profiles were obtained for mixing of 50 mW reactant solutions at 25 °C and K = 246 in a meander micro mixer close to the inlet (see Figure 1.153) [47]. At the start of the mixing process only one lamella is visible, corresponding to about 10 mM reaction product. Further downstream, the next profiles provide a multitude of lamellae, which represent between 2 and 24 mM product. At still further positions in the meander channel, more homogeneous flow patterns are yielded and the product content is increased to between 15 and 28 mM. Finally, the concentration increases to values close to 50 mM which indicates complete mixing. [Pg.201]

The coiled tube has so far been the most frequent geometric form of the FIA microreactor. However, it is useful to review all channel geometries (Fig. 2.8). These are straight tube (A), coiled tube (5), mixing chamber (C), single-bead string reactor (D), 3-D or knitted reactor (E)y and imprinted meander (cf. microconduits Section 4.12) or combinations of these geometries. [Pg.31]

Rule 5. In order to reduce axial dispersion, which leads to lower of sampling frequency, the flow channel should be uniform, without wide sections (which behave like poorly mixed chambers), and should be coiled, meandered, packed, or 3-D disoriented. Other types of sudden changes in direction of flow should also be included in the design. [Pg.36]

Chang, Y. C. (1971). Lateral mixing in meandering channels. Ph.D. Dissertation, University of Iowa, Iowa City. [Pg.297]

The wide applications of Taylor flow for reactions and separations come from its stability and ability to provide well-defined high specific interfacial area. The recirculation within the liquid slugs improves heat and mass transfer from liquid to wall and interfacial mass transfer from gas to liquid [26]. It reduces axial dispersion and enhances radial mixing. The radial mixing can further be enhanced using meandering channels as shown in Figure 7.6c [27]. [Pg.276]

Dean flow as a static mixer The use of the fluid inertia across a curved channel can create turbulence. The flow of fluids in the meandering channels undergoes mixing due to the inertia of the fluid in the flow direction. An example is shown in Figure II.6, while the Dean number is defined in the side bar. [Pg.115]

In the flow and mixing experiments two different channel structures were used In both structures the width and the height of the two test channels were 280 mm by 25 mm One channel was straight and had a length of 5 mm, and the other was meander-shaped with ten curves and a total length of 25 mm The flow rate was varied between 0 06 ml/min and 6 ml/min... [Pg.146]


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