纳米流体封装：潜在的光-热能转换和显热存储装置
Nanofluid Filled Enclosures: Potential Photo-thermal Energy Conversion and Sensible Heat Storage Devices
摘要：
在目前的工作中，我们提出了“纳米流体填充外壳”作为潜在的光-热能转换和显热存储设备。在本文中，纳米流体的光学充电已经被建模为“太阳辐射能-纳米颗粒”相互作用。随后的能量重新分配已被建模为耦合传输现象，涉及质量，动量和能量传输。特别是，纳米流体填充的外壳绝热，等温（通过对流）边界进行了分析，分别破译显热存储和热排放能力的基本限制。此外，纳米粒子的体积分数的光-热能转换机制及其再分配的影响进行了严格的研究。详细的分析表明，在类似的操作条件下，在体积吸收模式（即，在低纳米颗粒体积分数下）纳米流体填充的外壳具有比相应的表面吸收模式下更高的显热存储（高7% - 27%）和热释放（高16% - 47%）能力（即，在高纳米颗粒体积分数下）。总的来说，“纳米流体填充的外壳”，特别是在体积吸收模式下，可以用于有效的太阳能热转换和存储。
英文摘要：
In the present work we propose "nanofluid filled enclosures" as potential photo-thermal energy conversion and sensible heat storage devices. Herein, the optical charging of the nanofluid has been modeled as "solar radiant energy - nanoparticles" interaction. The subsequent energy redistribution has been modeled as coupled transport phenomena involving mass, momentum and energy transport. In particular, nanofluid filled enclosure with adiabatic, and isothermal (through convective) boundaries have been analyzed to decipher the fundamental limits of sensible heat storage and thermal discharging capacities respectively. Furthermore, the effect of nanoparticles volume fraction on the photo-thermal energy conversion mechanisms and its redistribution thereof has been critically investigated. Detailed analysis reveals that under similar operating conditions, in volumetric absorption mode (i.e., at low nanoparticles volume fraction) nanofluid filled enclosure has higher sensible heat storage (7% - 27% higher) and thermal discharging (16% - 47% higher) capacities than in the corresponding surface absorption mode (i.e., at high nanoparticles volume fraction). Overall, "nanofluid filled enclosures", particularly in volumetric absorption mode, could be deployed for efficient solar thermal conversion and storage.
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