The Numerical study of thermal flow characteristics for piezoelectric fan on rectangular channel

This study used the commercial CFD software ANSYS CFD / Fluent, for simulating the transient flow field and investigating the radiator heat effects of radiator for single piezoelectric fan in a single rectangular flow channel, respectively, for two kinds of heat devices, which were flat and square columnar types placed horizontally or vertically in order to find the optimum cooling radiator position; the numerical simulation study of the parameters, including the distance from the tip of fan blade to the front edge of the radiator (Lg), the center of piezoelectric fan to the flow channel plate height (Hw), and fin column (n). The results of heat flux were from the solver and in these configurations of piezoelectric fans, Niu Saier number (Nu) and the coefficient of performance (COPv), which should be applied to prove the results, respectively. Piezoelectric fan was placed in front of the radiator flow channel; the cooling air was imported in the radiator and produced the vortex flow which enhanced the mixture capabilities for cooling and hot air around the radiator. As piezoelectric fan activated, the blade upper and down parts or left and right direction of blade had a strong impinging flow on the stream, so the impact flow which happened closer to the piezoelectric fan hadthe better results of cooling effects. And the piezoelectric fan was reciprocated, that conformation impinging flow damaged the temperature of boundary layer; in the direction of the actuating blade tip, the fluid was reciprocated, and the direction of flow pulled the blade tip, generated vortex, and formed entrained flow, which effectively mixed hot and cold ambient air simultaneously.