Thermo-Fluid Optimization of a Porous Absorber With a Variable Pore Structure
Thermo-Fluid Optimization of a Porous Absorber With a Variable Pore Structure
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可变孔结构多孔吸收体的热流体优化
DOI：
10.1115/1.4037350
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发表时间：
2017
影响因子：
2.3
通讯作者：
Zhou L.
中科院分区：
文献类型：
--
作者：
Wang P.;Li J. B.;Vafai K.;Zhao L.;Zhou L.
本文对具有连续线性孔隙度或孔径分布的多孔吸收体进行了基于速度场、温度场和辐射场重建的优化。本研究分析了三种典型的线性孔隙结构分布：递增型（“I”）、递减型（“D”）和恒定型（“C”）。总的来说，D型孔隙度（φ）与I型孔径（dp）相结合是多孔吸收体较好的孔隙结构布局。在减震器设计中应避免的性能差范围，分别是在较大的孔隙度分布（ϕi= ~ 0.7和ϕo> 0.6）和孔径分布（di= 1.5-2.5 mm）范围内。进口孔隙度较大（ϕi> 0.8）时，孔隙度梯度较大（Gp）的D型布局热性能较好；但考虑到较低的压降，建议采用进口孔径较小（di< 1.5 mm）、孔径梯度（Gdp）较大的I型布置。不同的孔结构布局（D型或I型）对压降的影响显著，即使在相同的平均ϕa和da下，其最大偏差可达70.1%。综合性能评价标准（PEC）值表明，较大的D型布置具有优异的热压降性能，且部分I型布置的PEC值大于1。
Optimization based on reconstruction of the velocity, temperature, and radiation fields in a porous absorber with continuous linear porosity or pore diameter distribution is carried out in this work. This study analyzes three typical linear pore structure distributions: increasing (“I”), decreasing (“D”), and constant (“C”) types, respectively. In general, the D type porosity (ϕ) layout combined with the I type pore diameter (dp) distribution would be an excellent pore structure layout for a porous absorber. The poor performance range, which should be avoided in the absorber design, is found to be within a wide range of porosity layouts (ϕi= ∼0.7 andϕo> 0.6) and pore diameter layouts (di= 1.5–2.5 mm), respectively. With a large inlet porosity (ϕi> 0.8), the D type layout with larger porosity gradient (Gp) has a better thermal performance; however, the I type dplayout with a smaller inlet pore diameter (di< 1.5 mm) and a larger pore diameter gradient (Gdp) is recommended when considering the lower pressure drop. Different pore structure layouts (D type or I type) have a significant effect on the pressure drop, even with the same averageϕaand da, the maximum deviation can be up to 70.1%. The comprehensive performance evaluation criteria (PEC) value shows that the D typeϕlayout with a largerϕahas an excellent thermopressure drop performance, and a part of PEC values for the I type dplayout are greater than unity.