Abstract
The flow behaviour and performance parameters of a diffuser-nozzle element of a valveless micropump have been investigated for different geometric and flow properties. When a fluctuating pressure is imposed on the inlet boundary of a diffuser-nozzle element, there is a net flow in diffuser direction due to the dynamic effect. The variation of this net flow along with rectification capacity, and diffuser efficiency has been investigated for different inlet-outlet length combination and frequencies of driving pressure. Flow behaviour and recirculation region have been studied. Pressure and velocity have been analyzed for quantitative analysis and for validation with results found in literature. 2-D geometry has been used in the present study. 3-D geometry has been modeled to justify the results obtained from 2-D analysis. Different inlet-outlet length combinations ranging from 0.2 to 1.0 mm has been investigated. Five different pressure frequencies in the range from 5 to 50 kHz have been considered to identify their effects on the performance of diffuser-nozzle element. The net flow and performance of the nozzle-diffuser element are found to be less dependent on outlet length while more dependency was found on inlet length. Further, the performance becomes weaker with the increase of frequency of inlet driving pressure pulsation.
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Acknowledgements
The present work has been carried out with computational resource support from Higher Education Quality Enhancement Project (HEQEP), AIF (2nd Round)-Sub-Project CP 2099, UGC, MoE, Government of Bangladesh (Contract no. 28/2012).
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Das, P.K., Hasan, A.B.M.T. (2018). Flow and Performance Analysis of a Valveless Micropump. In: Nguyen-Xuan, H., Phung-Van, P., Rabczuk, T. (eds) Proceedings of the International Conference on Advances in Computational Mechanics 2017. ACOME 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7149-2_54
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DOI: https://doi.org/10.1007/978-981-10-7149-2_54
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