An analytical consideration of steady-state forced convection within a nanofluid-saturated metal foam
An analytical consideration of steady-state forced convection within a nanofluid-saturated metal foam
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DOI：
10.1017/jfm.2015.131
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发表时间：
2015-03
影响因子：
3.7
通讯作者：
W. Zhang;W. Li;A. Nakayama
中科院分区：
文献类型：
--
作者：
W. Zhang;W. Li;A. Nakayama
一个分析的考虑已作出探索的速度，温度和纳米粒子的分布和传热特性与热分散和纳米粒子的机械分散在纳米流体饱和的均匀金属泡沫。一个体积平均理论被严格地应用到本地集成的一组控制方程的基础上修改Buongiorno模型在孔隙尺度。因此，一组宏观的体积平均的控制方程推导出允许纳米流体和金属相之间的间隙热传递。对未知项进行数学建模，以获得一组封闭的体积平均控制方程。随后，进行了孔隙尺度分析，以找到可能的功能形式，用于描述热分散和纳米粒子的机械分散在纳米流体饱和的金属泡沫。使用所得到的一组体积平均的控制方程，在纳米流体饱和的金属泡沫中的强制对流流动进行了分析研究的稳态情况。最终，已经预测，通过金属泡沫和纳米流体的组合可以实现非常规的高水平的传热速率（比没有金属泡沫的基础流体对流的情况高约80倍）。
An analytical consideration has been made to explore the velocity, temperature and nanoparticle distributions and heat transfer characteristics associated with thermal dispersion and nanoparticle mechanical dispersion within a nanofluid-saturated homogeneous metal foam. A volume-averaging theory was rigorously applied to integrate locally a set of governing equations based on the modified Buongiorno model at the pore scale. Thus, a macroscopic set of volume-averaged governing equations were derived allowing interstitial heat transfer between the nanofluid and metal phases. Unknown terms were modelled mathematically to obtain a closed set of volume-averaged governing equations. Subsequently, a pore-scale analysis was carried out to find possible functional forms for describing thermal dispersion and nanoparticle mechanical dispersion in a nanofluid-saturated metal foam. Using the resulting set of volume-averaged governing equations, forced convective flows in nanofluid-saturated metal foams were analytically investigated for the steady-state case. Eventually, it has been predicted that an unconventionally high level of the heat transfer rate (about 80 times more than the case of base fluid convection without a metal foam) may be achieved by combination of metal foam and nanofluid.