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| 密排六方颗粒填充床内对流换热的模拟研究 |
| Simulation of convective heat transfer in a packed bed with hexagonal close-packed particles |
| 投稿时间：2019-03-07 |
| DOI： |
| 中文关键词: 密排六方堆积 球形颗粒 填充床 对流换热 堆积结构 数值模拟 |
| 英文关键词: hexagonal close-packed spherical particle packed bed convective heat transfer packing structure numerical simulation |
| 基金项目:国家自然科学基金资助项目(51476124；51674030). |
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| 中文摘要: |
| 针对颗粒堆积结构对填充床内对流换热的影响,利用ICEM和FLUENT等流体力学软件对密排六方堆积结构进行建模,采用RNG k-ε湍流模型以及等比例缩放的壁面函数对结构内转捩流和湍流进行数值模拟,使用CFD-Post后处理软件计算分析结构内流体的压力降、流动阻力系数和综合换热系数,并与无序堆积结构和具有同样孔隙率的面心立方堆积结构进行比较。结果表明,相比于面心立方堆积结构和无序堆积结构,密排六方堆积结构内流体的压降明显增加；在孔隙雷诺数小于1500时,密排六方堆积结构内流体的阻力系数小于面心立方堆积结构及无序堆积结构内流体的阻力系数；密排六方堆积结构的颗粒壁面努塞尔数明显大于面心立方堆积结构及无序堆积结构的颗粒壁面努塞尔数,该堆积结构具有更好的综合换热效率。 |
| 英文摘要: |
| To investigate the influence of particle stacking structure on the convective heat transfer in the packed bed, modeling of hexagonal close-packed structure was carried out by means of such fluid mechanics software as ICEM and FLUENT. The RNG k-ε turbulence model and the scaled wall function were applied to numerically study the transition flow and turbulent flow in the structure. CFD-Post post-processing software was used to calculate the pressure drop of fluid,resistance coefficient and the integrated heat transfer coefficient, which were then compared with those of disordered stacking structure and face-centered cubic packing structure of the same porosity. The results show that the pressure drop of fluid in the dense hexagonal packing structure increases obviously compared with the face-centered cubic packing structure and the disordered packing structure. When the pore Reynolds number is less than 1500, the fluid resistance coefficient in the hexagonal close-packed structure is smaller than that in the face-centered cubic packing structure and disordered packing structure. The Nusselt number of particle walls in the densely arranged hexagonal packing structure is obviously higher than that in the face-centered cubic packing structure and disordered packing structure, which has higher comprehensive heat transfer efficiency. |
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