The present study improves our understanding of the fluid mechanics of the air flows generated by the piezoelectric fans and their correlation with their heat transfer performance and cooling power efficiency. The absence of propagating vortices in this regime is further validated by numerical simulations. This leads to a precipitous drop in the heat transfer performance. When a piece of piezoelectric material undergoes physical deformation, an electric charge is generated conversely, when a charge is passed through the. Under an alternating electrical current, the piezo actuator oscillates back and forth, generating airflow. Piezoelectricity is a characteristic exhibited by certain solids which allows for a linear, reversible relationship between mechanical stress and electrical charge. A piezoelectric actuator is a cantilever made from metal or plastic with a piezoelectric material bonded to it. Our experiments show that there is a threshold blade tip velocity below which no propagating vortices and hence no appreciable air flows in the forward direction are generated. The cooling performance of piezoelectric actuators is evaluated for low-form-factor electronics in this work. Concurrently, for each tip velocity, we measure the fan power consumption, corresponding heat transfer coefficients and normal forces on flat heated surfaces oriented perpendicular to the beam axis. to a heat source (124) that includes a thermally conductive element (104) and a piezoelectric element (102a.
Particle Image Velocimetry (PIV) visualization experiments were performed to compare the spatial propagation of vortices generated by the vibrating beams while varying the blade tip velocities. WO1996012924 - PIEZOELECTRIC COOLING DEVICE. We report an experimental and numerical modeling study to help elucidate how the characteristics of the airflows generated by piezoelectric fans relate to their heat transfer performance and cooling power efficiency. Piezoelectric fans offer a promising alternative to rotary fans due to their simpler structures, less noise, and lower power consumption.
0 kommentar(er)
