壓電風扇與散熱器組合系統(tǒng)的散熱性能及其改進

岳佳斌 朱敏波 嚴松

摘要： 為提高散熱器的散熱性能，將壓電風扇分別與直肋和針肋式散熱器組合進行散熱，利用FLUENT軟件仿真其散熱流場并計算其協(xié)同角，分析2種散熱器的散熱性能特點。考慮壓電風扇的振動特性，將直肋式散熱器的肋片改為扇形布置，并根據(jù)仿真結(jié)果進一步將該散熱器扇形肋片的后端改為針肋，設計新型散熱器。根據(jù)散熱器溫度和協(xié)同角分布對散熱器的散熱性能進行評價分析，結(jié)果表明：自然散熱時，針肋散熱器的散熱性能最好，且協(xié)同角相對較小;當壓電風扇工作時，新型散熱器散熱性能最好，可比原直肋散熱器組合溫度降低4 K，比原針肋散熱器組合溫度降低2 K。新型散熱器僅通過改變散熱器的肋片布置即可明顯改善散熱器的散熱性能。

關(guān)鍵詞： 壓電風扇; 散熱器; 協(xié)同角; 仿真

中圖分類號： TP391.99; TN606 ? 文獻標志碼： B

Abstract： To improve the heat dissipation performance of the heat sink， the piezoelectric fan is combined with the plate-fin heat sink and the pin-fin heat sink respectively to dissipate heat， and FLUENT software is used to simulate the heat dissipation flow field and calculate the synergy angle， and then the heat dissipation characteristics of two kinds of heat sink are analyzed. Considering the vibration characteristics of piezoelectric fans， the plate-fin heat sink is improved to fan-shaped arrangement. According to the simulation results， the rear fin of the fan-shaped plate-fin heat sink is further improved to the pin-fin， and then the new heat sink is obtained. According to the heat sink temperature and synergy angle distribution， the heat dissipation performances of the heat sinks are evaluated and analyzed. The results show that： under natural heat dissipation， the heat dissipation performance of pin-fin heat sink is the best， and the synergy angle is relatively small; when combined with the piezoelectric fan， the heat dissipation performance of the new heat sink is the best， which is about 4 K lower to the plate-fin heat sink combination， and 2 K lower to the pin-fin heat sink combination. The heat dissipation performance of the new heat sink is obviously improved only by changing the fin arrangement.

Key words： piezoelectric fan; heat sink; synergy angle; simulation

0 引 言

隨著電子技術(shù)的快速發(fā)展，電子產(chǎn)品向高性能、多功能和小型化方向發(fā)展，導致電子設備的功耗和發(fā)熱量增加。為不影響電子產(chǎn)品正常工作，須發(fā)散多余的熱量。壓電風扇占用空間小、工作聲音小、功耗低，能夠較好地應用于小型電子設備。[1-3]在實際應用中，通常將壓電風扇與散熱器相結(jié)合對電子元件進行組合散熱。國內(nèi)外專家研究分析壓電風扇置于散熱器外部不同位置時的散熱性能[4-5]、壓電風扇置入散熱器內(nèi)部時的散熱性能[6-7]、壓電風扇與散熱器結(jié)合其他散熱方式共同散熱時的散熱性能[8]等。由場協(xié)同理論可知，協(xié)同角取值范圍為0～90°，且角度越小越有利于傳熱[9-11]?！?br>