The Study of Multiple Piezoelectric-Magnetic Fans Modularized
Date Issued
2015
Date
2015
Author(s)
Ke, Sing-Yi
Abstract
This study is aimed at improving the thermal efficiency of a modularized multiple fans-piezoelectric actuator (MFPA) system by a proper housing design. Previous studies showed that thermal performance of a MFPA system is influenced by investigation of the maximum vibration amplitude, resonance effect, material and the pitch ratio of fan. However, there still exists a common problem remaining unsolved, i.e., the air flow is not fully utilized. If the air stream can be properly guided and more effectively utilized, the thermal performance can be further improved. Thus, this study focuses on resolving this deficiency by a proper housing design. By defining the dimensionless geometrical ratios of the housing design, experiments are properly designed and performed under the following operation conditions: power consumption of 0.2W with input frequency of 46Hz and heat source of 15W. Experimental results are presented and discussed in terms of the dimensionless length number (Y*), dimensionless width number (Z*), and the housing angle(θ). The result showed that the thermal efficiency η is improved to reach a maximum value near Y*=0.417, Z*=1.25 and θ=64.43° with a minimum thermal resistance of 4.45°C/W and a temperature reduction of 53.13℃. Compared with no housing design, the thermal efficiency η is improved from 33.45% to 46.61%. Numerical simulation and analysis are also employed to study the nozzle angle effects. It is found that the flow configuration with a maximum average velocity appears nearθ=65°, which is consistent with the experiment results.
Subjects
modularized multiple fans-piezoelectric actuator
housing design
dimensionless geometrical ratios
SDGs
Type
thesis