Enhanced Wickability in Single- and Three-Columnar Bi-Particle Size Wicks using Multiphase Lattice Boltzmann Method
Enhanced Wickability in Single- and Three-Columnar Bi-Particle Size Wicks using Multiphase Lattice Boltzmann Method
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DOI：
10.1016/j.compfluid.2023.105831
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Mohammad Borumand;Taehun Lee;G. Hwang
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文献类型：
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作者：
Mohammad Borumand;Taehun Lee;G. Hwang
增强的芯吸性，即，渗透性和毛细泵送能力对于两相热管理和生物医学系统至关重要，然而，同时增强它们是具有挑战性的。在这项研究中，增强芯吸性检查使用单/三柱双粒径芯（BPSW）。采用两相单组分自由能格子玻尔兹曼方法（LBM）模拟了不同颗粒/孔隙分布的增强孔隙尺度毛细流。结果表明，单柱和三柱BPSW的累积液体饱和度（渗透率的测量）分别增加到53%和18%，而它们的毛细管压力分别增加了76%和39%，相比于均匀颗粒尺寸芯（UPSW）。这种增强与以下事实有关：局部较大的孔允许主要液体路径，而较小的孔同时增加毛细管压力。增大的孔径比导致累积液体饱和度提高13%和26%，而单柱和多柱BPSW中的毛细管压力增加38%和30%。模拟结果为高热流密度两相热管理系统的最佳细芯结构提供了见解，通过非均匀孔径来增强芯吸性。
An enhanced wickability, i.e., permeability and capillary pumping capability, is crucial to two-phase thermal management and bio-medical systems, however, it is challenging to enhance them simultaneously. In this study, the enhanced wickability is examined using single-/three-columnar Bi-Particle-Size Wicks (BPSW). The enhanced pore-scale capillary flow with various particle/pore distributions is simulated using a two-phase single component free-energy-based Lattice Boltzmann Method (LBM). The results show that the cumulative liquid saturation of the single- and three-columnar BPSWs (measure of permeability) increases up to 53 and 18%, respectively, while their capillary pressure increases by 76 and 39%, respectively, compared to the Uniform-Particle-Size Wicks (UPSW). The enhancement is related to the fact that the localized larger pores allow for the primary liquid pathways, while the smaller pores increases the capillary pressure simultaneously. The increased pore size ratio leads to 13 and 26% improvement in the cumulative liquid saturation, while it shows the additional 38 and 30% increase in the capillary pressures in the single- and multi-columnar BPSWs. The simulation results provide insights into the optimal thin wick structures for high heat flux two-phase thermal management system by enhancing the wickability through the non-uniform pore sizes.