DC12025, ventilateur à roulement à aiguilles 120*120*25 12V câbles 14.37 ?

School of Mechanical Engineering, Purdue University
 
Piezoelectric fans are very low power, small, very low noise, solid-state devices that have recently emerged as viable thermal management solutions for a variety of portable electronics applications including laptop computers, cellular phones and wearable computers. Piezoelectric fans utilize peizoceramic patches bonded onto thin, low frequency flexible blades to drive the fan at its resonance frequency. The resonating, low frequency blade creates a streaming airflow directed at key electronicse components. The optimization of a piezoelectric fan with two symmetrically placed piezoelectric patches is investigated through an analytical Bernoulli-Euler model as well as a finite element model of the composite piezo-beam. The closed form analytical solution is used to demonstrate that different optimal piezoceramic-to-blade length ratios and piezoceramic-to-blade thickness ratios exist for maximizing the electromechanical coupling factor, tip deflection and rotation, and stroke volume rate. Such optimization procedures provide simple design guidelines for the development of very low power, high flow rate piezoelectric fans.

The piezoelectric fans can be made in a wide range of sizes. The Purdue engineers will be developing fans small enough to fit on a computer chip: their blades will be only about 100 microns long, which is roughly the width of a human hair, Garimella said.  
 
Such fans might be used to cool future chips that produce more heat than their conventional counterparts. The concentrated circuits in a semiconductor computer chip can generate more heat per square centimeter of chip area than an area of equal size on the sun's surface, he said.