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首页> 外文期刊>Journal of Thermal Science and Engineering Applications: Transactions of the ASME >Influence of Pore Density and Porosity on the Melting Process of Bio-Based Nano-Phase Change Materials Inside Open-Cell Metal Foam
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Influence of Pore Density and Porosity on the Melting Process of Bio-Based Nano-Phase Change Materials Inside Open-Cell Metal Foam

机译：孔密度和孔隙率对开放式金属泡沫中生物基纳米相变材料熔化过程的影响

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摘要

In this paper, experimental investigations were carried out to observe the melting process of a bio-based nano-phase change materials (PCM) inside open-cell metal foams. Copper oxide nanoparticles with five different weight fractions (i.e., 0.00%, 0.08%, 0.10%, 0.12%, and 0.30%) were dispersed into bio-based PCM (i.e., coconut oil) to synthesize nano-PCMs. Open-cell aluminum foams of different porosities (i.e., 0.96, 0.92, and 0.88) and pore densities (i.e., 5, 10, and 20 pores per inch (PPI)) were considered. An experimental setup was constructed to monitor the progression of the melting process and to measure transient temperatures variations at different selected locations. Average thermal energy storage rate (TESR) was calculated, alongside the melting time was recorded. The effects of various nanoparticles concentration, metal foam pore densities, porosities, and isothermal surface temperature on the melting time, TESR, thermal energy distribution, and the melting behavior were studied. It was observed that the melting time significantly reduced by using metal foam and increasing the isothermal surface temperature. It was concluded that the effect of adding nanoparticles on the TESR depends on the characteristics of metal foam, as well as, the weight fractions of nanoparticles. The change in TESR varied from -1% to 8.6% upon addition of 0.10 wt % nanoparticles compared to pure PCM, whereas the increase in the nanoparticles concentration from 0.10% to 0.30% changed TESR by -10.6% to 4.5%. The results provide an insight into the interdependencies of parameters such as pore density and porosity of metal foam and nanoparticles concentration on the melting process of nano-PCM in metal foam.
机译：本文进行了实验研究，观察了开放式金属泡沫中生物基纳米相变材料（PCM）的熔化过程。将具有五种不同重量级分的氧化铜纳米颗粒（即0.00％，0.08％，0.10％，0.12％和0.30％）分散到基于生物的PCM（即椰子油）中以合成纳米PCM。考虑了不同孔隙症的开放式铝泡沫（即0.96,0.92和0.88）和孔密度（即每英寸（PPI））的孔密密度（即5,10和20个）。构造实验设置以监测熔化过程的进展，并测量不同选定位置的瞬态温度变化。计算平均热能存储速率（TESR），记录熔化时间。研究了各种纳米颗粒浓度，金属泡沫孔密度，孔隙率和等温表面温度对熔化时，TESR，热能分布和熔化行为的影响。观察到通过使用金属泡沫并增加等温表面温度，熔化时间显着降低。得出结论：向TESR上添加纳米颗粒的效果取决于金属泡沫的特性，以及纳米颗粒的重量级分。与纯PCM相比，加入0.10wt％纳米粒子后，TESR的变化从-1％至8.6％变化，而纳米颗粒浓度的增加从0.10％升高至0.30％，将TESR变为-10.6％至4.5％。结果对金属泡沫中纳米PCM熔化过程的孔泡沫和纳米颗粒浓度等参数等参数的相互依存性见解。

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