真空与低温
真空與低溫
진공여저온
VACUUM AND CRYOGENICS
2015年
1期
33-37
,共5页
双层树型微通道%热流耦合%冷却
雙層樹型微通道%熱流耦閤%冷卻
쌍층수형미통도%열류우합%냉각
double-layer tree-shaped microchannel%heat-flow coupling field%cooling
建立了双层树型微通道换热器三维模型，模拟分析了其热流耦合场。对比单、双层树型微通道换热器的最高温度及双层树型微通道在顺流、逆流、交叉流三种情况下的冷却效果及底面温度分布所占比例。底部热流密度qw=50 W·cm-2时，单层树型微通道底面最高温度为102.5℃，双层树型微通道底面最高温度低于63.38℃，底面温度低于60℃部分所占比例均高于60%。双层树型微通道冷却效果明显优于单层，在逆流方式下，双层树型微通道底面温度分布均匀，中心部分具有较低温度，有效改善了一般换热器散热不均而造成的中心部分温度过高的问题。
建立瞭雙層樹型微通道換熱器三維模型，模擬分析瞭其熱流耦閤場。對比單、雙層樹型微通道換熱器的最高溫度及雙層樹型微通道在順流、逆流、交扠流三種情況下的冷卻效果及底麵溫度分佈所佔比例。底部熱流密度qw=50 W·cm-2時，單層樹型微通道底麵最高溫度為102.5℃，雙層樹型微通道底麵最高溫度低于63.38℃，底麵溫度低于60℃部分所佔比例均高于60%。雙層樹型微通道冷卻效果明顯優于單層，在逆流方式下，雙層樹型微通道底麵溫度分佈均勻，中心部分具有較低溫度，有效改善瞭一般換熱器散熱不均而造成的中心部分溫度過高的問題。
건립료쌍층수형미통도환열기삼유모형，모의분석료기열류우합장。대비단、쌍층수형미통도환열기적최고온도급쌍층수형미통도재순류、역류、교차류삼충정황하적냉각효과급저면온도분포소점비례。저부열류밀도qw=50 W·cm-2시，단층수형미통도저면최고온도위102.5℃，쌍층수형미통도저면최고온도저우63.38℃，저면온도저우60℃부분소점비례균고우60%。쌍층수형미통도냉각효과명현우우단층，재역류방식하，쌍층수형미통도저면온도분포균균，중심부분구유교저온도，유효개선료일반환열기산열불균이조성적중심부분온도과고적문제。
This work built a three-dimensional model of double-layer tree-shaped microchannel heat exchanger (MCHE),simulated and analyzed the heat-flow coupling field. The maximum temperature of single-layer MCHE was compared with double-layer MCHE,and the cooling efficiency of tree-shaped MCHE under parallel flow,contrary flow and cross flow was analyzed. When bottom heat fluxes qw=50 W·cm-2,The maximum temperature of single-layer MCHE is 102.5℃and double-layer MCHE is 63.38℃. The ratio of bottom temperature under 60℃is more than 60%. The cool-ing effect of double-layer MCHE is obviously better than single-layer MCHE,and the temperature distribution of heated surface is uniform,the temperature of the centre part is lower,which effectively solved the high temperature in the centre part due to the nonuniform heat dissipation.
