Passive Mixer

The results from the several studies that have been conducted to measure exposures associated with the use of chlorpyrifos are summarized in Tables 1 and 2. Table 1 summarizes results from mixer-loader and applicator studies reported by Honeycutt et al.1 Listed for each work description are the number of replicates, the arithmetic mean, and the geometric mean for the replicates from both the passive dosimetry measurements and the biomonitoring tech-... 

Passive heat-transfer enhancement techniques, retrofitted, 13 267 Passive mixers, in microfluidics, 26 966, 967 Passive noise detectors, 11 673 Passive nondestructive tests, 17 416, 425 Passive reactors, 17 555 Passive sensing materials, 22 706-707 Passive smart textiles, 24 625 Passive solar collection, silica aerogel application, 1 761-762 Pasta products, 26 278 Paste-extrusion process, 18 301-302 Paste forming, ceramics, 5 651 Paste inks, 14 315-316... 

Many passive microstructured mixers (see e.g. [2, 3]) follow design principles used at the macro-scale for static mixers with internal packings [4], It stands to reason that some of the advantages in processing claimed for conventional static mixer also apply or may be even more pronounced when using static mixers [4] ... 

M 20] [P 19] An investigation of the flow patterns in the mixer outlet was made by dilution-type dye imaging [30], On contacting the two streams only in the mixer devices without any membrane actuation (static or passive case), a bi-layered system results with no obvious degree of mixing, as is to be expected. 

The use of the Coanda effect is based on the desire to have a second passive momentum to speed up mixing in addition to diffusion [55, 163], The second momentum is based on so-called transverse dispersion produced by passive structures, which is in analogy with the Taylor convective radial dispersion ( Taylor dispersion ) (see Figure 1.180 and [163] for further details). It was further desired to have a flat ( in-plane ) structure and not a 3-D structure, since only the first type can be easily integrated into a pTAS system, typically also being flat A further design criterion was to have a micro mixer with improved dispersion and velocity profiles. 

Hardt, S., Drese, K. S., Hessel, V., Schonfeld, F., Passive micro mixers for applications in the micro reactor and pTAS field, in Proceedings of the 2nd International Conference on Microchannels and Minichannels (17-19 June 2004), Rochester, NY, 2005, in print. 

Hessel, V., Lowe, H., Micro mixers-a review on passive and active mixing priciples, Chem. Eng. Sci. 2005, in print. 

A novel in-plane passive microfluidic mixer with modified Tesla structures,... 

Distinguish between passive and active micro mixers. List three examples in each case. (6 marks)... 

Hong, C.C., Choi, J.W., Ahn, C.H., A novel in-plane passive microfluidic mixer with modified Tesla structures. Labchip 2004, 4, 109-113. 

The subtraction process is carried out by a device called a mixer. There are various ways of actually making a mixer - some are active and contain the usual transistors and so on, some are passive and are mainly constructed from transformers and diodes. The details need not concern us - all we need to know is that a mixer takes two signal inputs at frequencies f and /2 and produces an output signal which contains the signals at the sum of the two inputs, (/i + ff) and the difference (/i — ff). The process is visualized in Fig. 5.9. 

Chung Y, Hsu Y, Jen C, Lu M, Lin Y (2004) Design of passive mixers utilizing microfluidic self-circulation in the mixing chamber. Lab Chip 4(l) 70-77... 

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