Abstract
Influence of perturbation frequency on mixing flow velocity and the varying flow structure in T-shape microchannels are investigated using laser induced fluorescence. The external disturbances of flow are created excitation system based on the piezoelectric actuator. Several increases in mixing efficiency were common to all regimes, but also some different features, were observed. For the stationary vortex flow regime, we obtained a decrease in mixing efficiency of 10% at a frequency of 650Hz. For the stationary asymmetric vortex flow regime, the mixing efficiency increases by 33% and 23% for the frequencies 500Hz and 800 Hz, respectively. For Re=400 and Re=300, the flow structures without disturbance are virtually identical; however, in the case of external influence for the quasiperiodic unsteady flow regime, the mixing efficiency decreases by 22% and 29% at distances of 1 and 5 calibres, respectively, for frequency of 1000 Hz.
Highlights
The development of precision technology, both in medical and biological industries, is impossible without the miniaturization of devices
Appearance of instability in flow leads to destruction of axial vortex symmetry, and we can obtain stationary asymmetric vortex flow
Dreher et al [8] have conducted a numerical simulation in the T-channel with rectangular cross section and showed that the best mixing occurs at Reynolds number from 240 to 700
Summary
The development of precision technology, both in medical and biological industries, is impossible without the miniaturization of devices. Hoffman et al [5] were the first researchers to investigate the different flow regimes in T-shape microchannels for various Reynolds numbers.
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