Temperature dependence of thermal conductivity enhancement for nanofluids
Temperature dependence of thermal conductivity enhancement for nanofluids
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DOI：
10.1115/1.1571080
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发表时间：
2003-08-01
影响因子：
--
通讯作者：
Roetzel, W
中科院分区：
文献类型：
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作者：
Das, SK;Putra, N;Roetzel, W
通常含有纳米级悬浮超细颗粒的换热流体被称为纳米流体，它开辟了换热过程的一个新维度。最近的研究证实了纳米流体在强化当代技术所需的传热方面的潜力。本研究详细地研究了以水为基础流体，以Al_2O_3或CuO颗粒为悬浮材料的纳米流体的导热系数随温度的增加。利用温度振荡技术测量了热扩散率，并由此计算了导热系数。结果表明，纳米流体的增强特性随着温度的升高而增加，这使得该纳米流体比先前报道的通常的室温测量更适合于具有高能量密度的应用。
Usual heat transfer fluids with suspended ultra fine particles of nanometer size are named as nanofluids, which have opened a new dimension in heat transfer processes. The recent investigations confirm the potential of nanofluids in enhancing heat transfer required for present age technology The present investigation goes detailed into investigating the increase of thermal conductivity with temperature for nano fluids with water as base fluid and particles of Al2O3 or CuO as suspension material. A temperature oscillation technique is utilized,for the measurement of thermal diffusivity and thermal conductivity is calculated from it. The results indicate an increase of enhancement characteristics with temperature, which makes the nanofluids even more attractive for applications with high energy density than usual room temperature measurements reported earlier.