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首页> 外文期刊>International Journal of Heat and Mass Transfer >Nonequilibrium Heat Conduction In A Nanofluid Layer With Periodicrnheat Flux
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Nonequilibrium Heat Conduction In A Nanofluid Layer With Periodicrnheat Flux

机译：具有周期性热通量的纳米流体层中的非平衡热传导

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摘要

Nonequilibrium heat conduction in a nanofluid layer with periodic heat flux on one side and specified temperature on the other side is studied numerically. The energy equations for the nanoparticles and base fluid are nondimensionalized and the problem is described by four dimensionless parameters: heat capacity ratio, volume fraction of nanoparticles, period of surface heat flux, and the Sparrow number. The Sparrow number is to describe the coupling between the energy equations for nanoparticles and base fluid. Nonequilibrium between nanoparticles and base fluid, as well as heat transfer enhancement in nanofluid, of three nanofluids (diamond-water, dia-mond-ethylene glycol, and copper-ethylene glycol) is investigated. The results showed that the nonequilibrium between the nanoparticles and base fluid exist for all three nanofluids at low Sparrow number and short period of surface heat flux. The results also showed that heat transfer in a liquid layer can be enhanced by adding nanoparticles to the base fluid, but the level of enhancement is not as high as those reported by using transient hot wire (THW) method.
机译：数值研究了一侧为周期性热通量而另一侧为特定温度的纳米流体层中的非平衡热传导。纳米粒子和基础流体的能量方程是无量纲的，该问题由四个无量纲参数描述：热容比，纳米粒子的体积分数，表面热通量的周期和麻雀数。 Sparrow数用于描述纳米粒子和基础流体的能量方程之间的耦合。研究了三种纳米流体（金刚石-水，金刚石-乙二醇和铜-乙二醇）在纳米颗粒和基础流体之间的非平衡以及纳米流体中的传热增强。结果表明，在低麻雀数和短时间表面热通量的情况下，所有三种纳米流体均存在纳米颗粒与基础流体之间的不平衡现象。结果还表明，可以通过将纳米颗粒添加到基础流体中来增强液体层中的传热，但是增强水平不如使用瞬态热线法（THW）所报道的那样。

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