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化工学报  2015 

减阻型纳米流体在圆管内的流动和换热特性

DOI: 10.11949/j.issn.0438-1157.20150496, PP. 4401-4411

Keywords: 纳米流体,减阻流体,稳定性,湍流,热传导,流动阻力

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Abstract:

实验测定了在Reynolds数4000~16000范围内,质量分数0~0.5%的石墨、多壁碳纳米管、Al2O3、Cu、Al、Fe2O3、Zn纳米粒子加入到100~400mg·kg-1浓度的十六烷基三甲基氯化铵(CTAC)减阻剂中所制备的减阻型纳米流体的摩擦阻力系数和对流传热系数。结果表明:在CTAC中加入水杨酸钠(NaSal)与去离子水所配制的减阻剂具有一定的稳定性和很强的减阻特性,当减阻剂浓度为200mg·kg-1时其减阻特性最优。石墨纳米粒子在增强对流换热和减少流动阻力方面具有较佳的综合性能,当石墨纳米颗粒质量分数为0.4%时,其综合性能因子K是去离子水的5倍。最后给出了减阻型石墨纳米流体在圆管内的流动阻力和换热关联式,其计算值和实验值吻合良好。

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