Enhanced heat transfer performance of an automobile radiator with graphene based suspensions
Enhanced heat transfer performance of an automobile radiator with graphene based suspensions
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DOI：
10.1016/j.applthermaleng.2017.05.076
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发表时间：
2017-08
影响因子：
6.4
通讯作者：
C. Selvam;D. Lal;S. Harish
中科院分区：
文献类型：
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作者：
C. Selvam;D. Lal;S. Harish
本文研究了石墨烯纳米片在水-乙二醇混合液中流过汽车散热器时的对流换热系数和压降。石墨烯纳米片的体积浓度从0.1%变化至0.5%。实验测量了纳米流体的导热系数、粘度、密度和比热容等热物理性质。纳米流体的质量流速从10 g/s变化到100 g/s。纳米流体入口温度被认为是35 °C和45 °C，而对于对流传热实验，环境空气速度被固定为3 m/s。纳米流体的对流换热系数随着石墨烯纳米片负载量、纳米流体入口温度和质量流量的增加而增加。当纳米流体入口温度为35 °C和45 °C时，对于最高浓度（0.5vol%）和最高质量流速（100 g/s），对流换热系数的增强分别为20%和51%。纳米流体的压降相对于石墨烯纳米片负载和质量流率而增加。随着纳米片的负载量从0体积%增加到0.5体积%，压降在35 °C下从3.07 kPa增加到4.88 kPa，而在45 °C下对于100 g/s，压降从3.02 kPa增加到4.04 kPa。目前的纳米流体有可能取代传统的传热流体导致紧凑的热系统。
We report the convective heat transfer coefficient and pressure drop of graphene nanoplatelets seeded in water-ethylene glycol mixture flowing through an automobile radiator. The volume concentrations of graphene nanoplatelets were varied from 0.1% to 0.5%. Thermophysical properties such as thermal conductivity, viscosity, density and specific heat capacity of nanofluids were measured experimentally. Mass flow rate of nanofluids were varied from 10 g/s to 100 g/s. Nanofluid inlet temperature was considered as 35 °C and 45 °C while the ambient air velocity was fixed as 3 m/s for the convective heat transfer experiments. The convective heat transfer coefficient of nanofluids increases with increasing loading of graphene nanoplatelets, nanofluid inlet temperature and mass flow rate. The enhancement of convective heat transfer coefficient for the highest concentration (0.5 vol%) and highest mass flow rate (100 g/s) was found to be 20% and 51% when the nanofluid inlet temperature was 35 °C and 45 °C respectively. The pressure drop of nanofluid increases with respect to graphene nanoplatelets loading and mass flow rate. As the loading of nanoplatelets increases from 0 to 0.5 vol% the pressure drop increases from 3.07 to 4.88 kPa at 35 °C while it increases from 3.02 to 4.04 kPa at 45 °C for 100 g/s. The present nanofluid has a potential to replace the conventional heat transfer fluids leading to compact thermal systems.