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SiC-水纳米流体在微小通道中的流动和换热特性

Keywords: 纳米流体,微小通道,体积分数,强化换热

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Abstract:

为了解决传统换热工质导热系数和传热性能不高的问题,以SiC-水纳米流体为工质,研究了不同体积分数(0.001%、0.005%、0.01%、0.1%、1%)的SiC-水纳米流体在多孔微通道平行流扁管中的单相流动和换热特性.该扁管矩形通道的水力直径为2.08mm,实验Re大约为150~5200.研究结果表明:随着体积分数的增加,纳米流体的Nu呈现先增长后下降的趋势;体积分数为0.01%的SiC-水纳米流体在Re≈5200时,Nu增长最大,增长率达到80.8%;纳米流体起到强化换热效果的同时,伴随着阻力增加.

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