Numerical analysis on the thermal performance of microchannel heat sinks with Al2O3 nanofluid and various fins
Numerical analysis on the thermal performance of microchannel heat sinks with Al2O3 nanofluid and various fins
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DOI：
10.1016/j.applthermaleng.2021.117458
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发表时间：
2021-08-25
影响因子：
6.4
通讯作者：
Rona, Aldo
中科院分区：
文献类型：
--
作者：
Ali, Abdullah Masoud;Angelino, Matteo;Rona, Aldo
通过数值模拟研究了用于高性能电制冷应用的微通道散热器的水力和热工性能。在150 W/cm(2)恒定热流密度下，对50条平行矩形冷却管道横穿正方形底座棱镜散热器的硅壁和流体区进行了共轭换热模拟。在298K下，纳米粒子体积分数为0~3%的Al_2O_3纳米流体冷却剂的雷诺数范围为100~350，模拟为单相均匀介质。矩形、扭曲和锯齿形翅片被插入到平面矩形通道中，以提高换热速率。锯齿形翅片和3%的Al_2O_3纳米流体具有最好的热性能，与没有翅片和普通水冷却相比，平均热壁接触温度降低了6.44K，努塞尔数提高了60%，第二定律效率提高了15%。与直翅片相比，微通道翅片的扭转意外地将微通道压降降低了2%至15%，这可能是由于微通道内的轴向质量流量分布更加均匀所致。
The hydraulic and thermal performance of microchannel heat sink configurations for high performance elec-tronic cooling applications is investigated by numerical modelling. Conjugate heat transfer simulations are ob-tained through the silicon walls and the fluid domain of a square base prism heat sink traversed by 50 parallel rectangular cooling ducts, under a 150 W/cm(2) constant heat flux input through the base. Al2O3 nanofluid coolant with a nanoparticle volume fraction ranging from 0 to 3% is supplied at 298 K, over the Reynolds number range 100 to 350, modelled as a single-phase homogeneous medium. Rectangular, twisted, and zig-zag fins are inserted into the plain rectangular duct to enhance the heat transfer rate. The zig-zag fin and 3% Al2O3 nanofluid provide the best thermal performance, with a 6.44 K lower average heated wall contact temperature, 60% higher Nusselt number, and 15% higher second law efficiency than without fins and plain water cooling. Twist in the micro-channel fin unexpectedly reduced the microchannel pressure drop by 2% to 15% compared to a straight fin, possibly due to the more evenly distributed axial mass flux across the microchannel.