Journal
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
Volume 27, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6439/aa703b
Keywords
microfluidics; microfluidic oscillator; equivalent circuit model; negative differential resistance; hydroelastics
Categories
Funding
- National Natural Science Foundation of China [51575282]
- Fundamental Research Funds for the Central Universities [30915118803]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Singapore Institute of Manufacturing Technology, under the Agency for Science, Technology and Research (A*STAR, Singapore)
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A microfluidic oscillator is of interest because it converts a stable laminar flow to oscillatory flow, especially in view of the fact that turbulence is typically absent in miniaturized fluidic devices. One important design approach is to utilize hydroelastic effect-induced autonomous oscillations to modify the flow, so to reduce the reliance on external controllers. However, as complex fluid-structure interactions are involved, the prediction of its mechanism is rather challenging. Here, we present a simple equivalent circuit model and investigate the negative-differential-resistance (NDR) mechanism of a hydroelastic microfluidic oscillator. We show that a variety of complex flow behaviors including the onset of oscillation, formation of different oscillation patterns, collapse of the channel, etc can be well explained by this model. It provides a generic approach for construction of microfluidic NDR oscillators, following which a new design is also proposed. Relevant findings give more insights into the hydroelastic instability problems in microfluidics, and enrich the study of microfluidic flow control devices based on the electric circuit theory.
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