Resfriamento de componentes eletrônicos por jatos sintéticos tangenciais

Abstract

This paper presents an experimental study related to the cooling of electronic devices using synthetic jets directed so that the jet flows tangentially to the heated surface. A custom-built experimental test bench especially developed based on other studies related to the subject. In this case, a speaker was used as a membrane and installed in a cavity in the test bench to form the synthetic jet generator. The synthetic jet cools a heating element that simulates the operation of an electronic device, positioned tangentially at various distance in relation to the exit plane of the synthetic jet. Cooling test procedures were performed in the custom-built experimental test bench in various operation modes of the heating element, using an average temperature of 80 ° C which is similar to the operating temperature of electronic devices. To generate the synthetic jet, sinusoidal input signals were applied with frequencies between 20 and 120 Hz and with amplitude of approximately 7.52 Vp which resulted in 20 Wrms power consumed by generator. In tests using a fixed power dissipated by the heating element, the temperature drop is monitored in the heating element. In the other test mode, the temperature on the heating element was set at a constant value the maximum power dissipated in the heating element was measured. Finally, comparisons were also performed between the cooling performance of synthetic jets and the conventional method with the use of three different coolers sizes. The same tests were performed on the same heating element and the corresponding velocities and cooling performance between the two methods were compared.