A novel
pore-array intensified tube-in-tube microchannel (PA) with
high throughput was developed to couple with a high-shear mixer (PAHSM)
for improving its mixing performance. Effects of structural and operating
parameters were intensively investigated with the Villermaux/Dushman
system. The results indicated that the mixing performance in PAHSM
was significantly impacted by the structural parameters, and it increased
with both the rotor speed and flow rate but not with the flow ratio.
The micromixing time estimated with the incorporation model could
reach 10–4 s. Compared with other mixing devices,
the PA liquid distributor can significantly enhance the mixing performance
of HSM with high throughput but low pressure drop. An artificial neural
network (ANN) was applied to correlate the micromixing time with the
investigated parameters, and the comparison between the model and
experimental data indicated that it was an efficient method to fit
experimental data in the PAHSM.
Dense networks of deformation twins endow metals and alloys with unprecedented mechanical properties. However, the formation mechanism of these hierarchical twin structures remains under debate, especially their relations with the imperfect nature of twin boundaries (TBs). Here, we investigate the intrinsic deformability of defective TBs in face-centered cubic metallic materials, where the inherent kinks on a set of primary TBs are demonstrated to facilitate the formation of secondary and hierarchical nanotwins. This defect-driven hierarchical twinning propensity is critically dependent on the kink height, which proves to be generally applicable in a variety of metals and alloys with low stacking fault energies. As a geometric extreme, a fivefold twin can be constructed via this self-activated hierarchical twinning mechanism. These findings differ from the conventional twinning mechanisms, enriching our understanding of twinning-mediated plasticity in metallic materials.
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