Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Concentration-adjustable micromixer using droplet injection into a
  microchannel   A novel micromixing technique that exploit a thrust of droplets into the
mixing interface is developed. The technique enhances the mixing by injecting
immiscible droplets in a mixing channel and the methodology enables a control
of the mixing level simply by changing the droplet injection frequency. We
experimentally characterize the mixing performance with various droplet
injection frequencies, channel geometries, and diffusion coefficients.
Consequently, it is revealed that the mixing level increases with the injection
frequency, the droplet-diameter-to-channel-width ratio, and the diffusion
coefficient. Moreover, the mixing level is found to be a linear function of the
droplet volume fraction in the mixing section. The results suggest that the
developed technique can produce a large amount of sample solution whose
concentration is arbitrary and precisely controllable with a simple and stable
operation.

25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom