Browsing by Author "Miyashiro, Hiroki"

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On-chip density mixer enhanced by air chamber
(2018-07-01)
Takayama, Toshio
;
Miyashiro, Hiroki
;
Tsai, Chia-Hung Dylan
;
Ito, Hiroaki
;
Kaneko, Makoto
This paper proposes an on-chip density mixer that can achieve even density in a target chamber with a swirling flow enhanced by an air chamber. The system is composed of a main channel, a target chamber where two liquids with different densities are included, an isolated air chamber, and an external vibration pump driven by a piezo actuator at the entrance of the main channel. The air chamber is expected to amplify the vibration owing to structure softening. The amplification would be more pronounced at the resonance frequencies of the structure. We developed the system and conducted experiments. We showed that the swirling motion in the target chamber with an air chamber is stronger than that without an air chamber. We also confirmed that the time resulting in even density is shorter when the pump is driven at a resonance frequency. An air-based virtual valve is introduced for maintaining a constant density in the target chamber. Published by AIP Publishing.
VIBRATION BASED VIRTUAL VORTEX GEAR
(2018-01-01)
Miyashiro, Hiroki
;
Takayama, Toshio
;
Tsai, Chia-Hung Dylan
;
Kaneko, Makoto
;
機械工程學系
This paper proposes Vibration based Virtual Vortex Gear (V(3)G) that can eventually produce a vortex flow in a micro chamber by pressure vibration. An interesting observation is that a vortex flow can be induced under V(3)G without continuous fluid flow in or out at the entrance of chamber, while it is completely different from our previously discovered Virtual Vortex Gear (V(2)G) where we apply a continuous fluid flow. The experiments have been performed to support the idea. Furthermore, we find that the characteristics of V(3)G is enhanced with an additional air chamber.