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By F. Ebrahimi

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15. 3 Performance test Fig. 16 shows the performance of the pump. From Fig. 16 (a), it can be seen that the maximum flow rate is about 10 mL/min. And maximum pressure head is about 250 kPa. The maximum pressure head is voltage dependant. As voltage increases, the pressure head can be further increased as shown in Fig. 16 (b). Compared with the regular piezoelectric diaphragm pump whose pressure head is mostly in the magnitude of ~50 kPa (Laser & Santiago, 2004; Luong & Nguyen, 2010), the advantage of the acoustic pump is the high pressure head.

Vol. 10, No. 1, (2010), pp. , & Płaczek M. (2011). Characteristic of the mechatronic system with piezoelectric actuator modeled as the combined beam, Proceedings of The 15th International Conference Modern Technologies, Quality and Innovation ModTech 2011, ISSN: 20696736, Vadul lui Voda, Chisinau, Republic of Moldova, May 2011 Fein O. M. (2008). A model for piezo-resistive damping of two-dimensional structures. Journal of Sound and Vibration, Vol. 310, No. 4-5, (2008), pp. 865-880, ISSN: 0022-460X Fleming A.

2 Modeling and simulation Fig. 15 is the simulation of the pressure pattern inside the pump casing. The casing was simplified as a cylinder in this 2D axisymmetric simulation. The length of the cylinder is one wavelength. The graph shows the right half piece of the model. The horn tip generates 1 µm displacement at 30 kHz. The colour represents the pressure magnitude in the unit of dB. Two boundary conditions are compared. Fig. 15 (a) is the absorbing condition. As mentioned earlier, a travelling wave will be generated at the tip.

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