Mechanism Investigation Of Thermoacoustic Wave Heat Dissipation

Nowadays,with the development and integration of electronic devices,traditional electronic cooling methods are failed to meet the requirements of heat flux density,integration or portability.Whereas thermoacoustic devices have advantages including simple construction,few or no moving parts,using environmentally friendly working medium.Which lead to easy integrated with electronic devices,thus they are suitable to be used for electronic heat dissipation.However,traditional thermoacoustic devices,such as thermoacoustic refrigerator(TAR)and thermoacoustic engine(TAE),have the defects of low heat flux density and high set up temperature,respectively.Hence,thermoacoustic heat dissipation(TAHD)method has been studied in this work,and is coupled with oscillating convection,aiming at providing a novel electronic heat dissipation method.The details shown as below.1.The CFD model of TAR/TAHD have been constructed by commercial software Comsol,the effectiveness of the model has also been analyzed.Based on that,the TAR/TAHD model of different operating temperatures have been calculated.Where the heat flux and temperature distribution,thermoacoustic microcirculation are considered to illuminate the mechanism of TAHD and compare the difference between TAR and TAHD.2.The couple mechanism of TAHD and oscillating convection is analyzed.The performance of the coupled heat dissipation method is analyzed under the short stack condition(the “short” means similar as the displacement of working fluid).The results show that,the coupled cooling method is superior than the single TAHD and the unidirectional convection.3.Multilayer optimization is introduced to TAR and TAHD in this work,and its impacts to the performance of thermoacoustic devices are also investigated.The effects of porosity and heat capacity on regenerator performance are mainly studied.The investigation shows that the multilayer optimization has positive impacts on TAR,which improve the cooling temperature difference and the cooling rate.However,the multilayer optimization has negative impacts on oscillating convection coupled TAHD.Finally,the experimental system of TAR/TAHD has been constructed,aiming at further verify and analyze the theoretical research results.