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An innovative cooling technology, multiple magnetic vibrating fins system with only one piezoelectric actuator, is investigated for the thermal management in this study. The vibrating driving force is generated by a piezoelectric actuator and then transfer to multiple magnetic fins by the magnetic forces. The multiple magnetic vibrating fins system in this study uses only one piezoelectric actuator...
Conventionally, thermal management of LEDs lighting is achieved by natural convection with different types of heat sink. However, as high-power LEDs lighting developing, passive cooling system can't afford sufficient cooling ability for LEDs lighting. Previous study developed a novel piezoelectric (PZT) fan with multiple magnetic fans cooling system which only used one piezoelectric actuator to provide...
Previous studies introduced novel multiple piezoelectric-magnetic fans (“MPMF”) which can improve its thermal performance effectively with only one piezoelectric actuator. Moreover, the T-shaped fan design also can increase sweep area of fan to drive more air and improve its thermal performance. This study focuses on investigating the effect of fan pitch (P) and gap (G) between fan tip and heat sink...
A new kind of metamaterial whose unit cell consists of gold rod pairs standing on gold plate is introduced in this paper. Electromagnetic parameters are extracted from the scattering (S) parameters for one unit cell, from which we obtain a negative permeability ?=?0.33 at 4.9 THz. Two wedges of different angles (about 18.4? and 26.6?) are designed to give direct evidence of negative refraction in...
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