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| Content Provider | IET Digital Library |
|---|---|
| Author | He, Xiuhua Shi, Jiawei Yang, Hang Lin, Nan Uzoejinwa, Benjamin Bernard |
| Abstract | A diffuser/nozzle is one of the most frequently-used channels in a valveless piezoelectric micropump, but its efficiency has not been satisfactory. Hence, optimisation of the channel structure is of great significance. The concave tuning diffuser/nozzle element can obtain steady flow rectification under different Reynolds numbers, and its efficiency is much higher than the conventional diffuser/nozzle element whose diverging angle is >25°. Therefore, the application of concave tuning on the micropump is promising and worth anticipating. In this work, the experiment and numerical simulation were carried out under the conditions of voltage (50–250 vpp), excitation frequency (10–1000 Hz) and Rec (100–1000). The results show that the performance of a micropump with concave tuning is better than that with a straight sidewall, as the pump efficiency is improved significantly. The position and size of vortexes are of great significance to the pump efficiency of the micropumps. The distribution of pressure in the micropumps with concave tuning and straight sidewall was displayed. With the increase of characteristic Reynolds number, the adverse pressure gradient occurred. Compared with the straight sidewall, the concave tuning structure can better withstand adverse pressure gradient and delay the boundary layer separation in the channel. |
| Starting Page | 765 |
| Ending Page | 770 |
| Page Count | 6 |
| Volume Number | 14 |
| e-ISSN | 17500443 |
| Issue Number | Issue 7, Jun (2019) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/mnl/14/7 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/mnl.2018.5712 |
| Journal | Micro & Nano Letters |
| Publisher Date | 2019-06-26 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Adverse Pressure Gradient Applied Fluid Mechanics Boundary Layer Boundary Layer Separation Buoyancy And Other Flows Involving Body Forces Channel Flow Characteristic Reynolds Number Computational Method Concave Tuning Diffuser/nozzle Element Concave Tuning Structure Diverging Angle Flow Separation Flow Simulation Flows in Ducts, Channel, And Conduits Frequency 10.0 Hz to 1000.0 Hz General Fluid Dynamics Theory Microchannel Flow Micropumps Nozzles Numerical Analysis Numerical Simulation Piezoelectric Device Pressure Distribution Pump Efficiency Rotational Flow Simulation Steady Flow Rectification Straight Sidewall Transient Flow Valveless Piezoelectric Micropump Vortexes Vortices |
| Content Type | Text |
| Resource Type | Article |
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