当前位置: X-MOL 学术Int. J. Heat Fluid Flow › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of packing height and location of porous media on heat transfer in a cubical cavity: Are extended Darcy simulations sufficient?
International Journal of Heat and Fluid Flow ( IF 2.6 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ijheatfluidflow.2020.108617
Manu Chakkingal , Sabino Schiavo , Iman Ataei-Dadavi , Mark J. Tummers , Chris R. Kleijn , Saša Kenjereš

Abstract We numerically investigate natural convection in a bottom-heated top-cooled cavity, fully and partially filled with adiabatic spheres (with diameter-to-cavity-size ratio d / L = 0.2 ) arranged in a Simple Cubic Packing (SCP) configuration. We study the influence of packing height and location of porous media. We carry out the simulations using water as the working fluid with Prandtl number, P r = 5.4 at Rayleigh number R a = 1.16 × 10 5 , 1.16 × 106 and 2.31 × 107. The applicability and suitability of Darcy-Forchheimer assumption to predict the global heat transfer is analysed by comparing it with the pore-structure resolved simulations. We found that the heat transfer in pore-structure resolved simulations is comparable to that in fluid-only cavities at high Rayleigh numbers, irrespective of the number of layers of packing and its location. Discrepancies in heat transfer between the Darcy-Forchheimer and the fully resolved simulations are observed when the porous medium is close to the isothermal wall and at high Ra, while it vanishes when the porous medium is away from the isothermal bottom wall.

中文翻译:

填充高度和多孔介质位置对立方空腔中传热的影响:扩展达西模拟是否足够?

摘要 我们对底部加热的顶部冷却腔中的自然对流进行了数值研究,该腔完全和部分填充有绝热球(直径与腔尺寸比 d / L = 0.2 ),这些球以简单立方填充 (SCP) 配置排列。我们研究了填充高度和多孔介质位置的影响。我们使用水作为工作流体进行模拟,Prandtl 数为 P r = 5.4,瑞利数 R a = 1.16 × 10 5 、1.16 × 106 和 2.31 × 107。 Darcy-Forchheimer 假设对预测的适用性和适用性通过将其与孔隙结构解析模拟进行比较来分析全局传热。我们发现孔隙结构解析模拟中的传热与高瑞利数下仅流体腔中的传热相当,与填料层数及其位置无关。当多孔介质靠近等温壁并处于高 Ra 时,可以观察到 Darcy-Forchheimer 和完全解析模拟之间的传热差异,而当多孔介质远离等温底壁时,这种差异消失。
更新日期:2020-08-01
down
wechat
bug