立方体填充料结构内换热与流动特性

doi:10.19799/j.cnki.2095-4239.2022.0673

摘要/Abstract

摘要：

填充床内填充料的结构对填充床内的流动与蓄放热性能有重要影响。本工作设计了一种立方体单元结构的填充料，该结构可以有序且稳定地堆积，使得填充床内流体的流动与换热更加均匀。采用数值模拟的方法对所设计立方体单元的换热与流动特性进行了研究，分析了在不同质量流量下，立方体单元内对流换热和压力损失的情况，并将研究结果与传统的小球简单立方堆积结构(SC)和体心立方堆积结构(BCC)进行了对比与分析。分析结果表明：当质量流量小于0.0018 kg/s时，立方体单元的传热系数略低于BCC，但明显高于SC；当质量流量大于0.0018 kg/s时，立方体单元的传热系数迅速增大，明显高于BCC和SC；随着质量流量的增加，其蓄/放热速度也逐渐高于BCC和SC。立方体单元内流体的压降始终介于SC和BCC之间，但随着流体质量流量的增加而增长迅速。通过分析综合换热性能发现立方体单元综合换热性能明显优于BCC，并且在质量流量小于0.0018 kg/s时，其综合换热性能为最优。总体研究表明，本工作所设计的立方体单元在换热速度和流动压降两方面具有更好的综合性优势，对有序堆积的填充床的填充料结构提供了一种参考。

关键词: 填充床储热, 填充料结构, 立方体单元, 流动特性, 换热特性

Abstract:

The structure of the filling material in the packed bed has an important impact on the flow and heat storage and release performance in the packed bed. In this study, a kind of packing material with cube cell structure is designed, which can be stacked orderly and stably, making the fluid flow and heat transfer in the packed bed more uniform. Through numerical simulation, the planned cube cell's heat transfer and flow characteristics were examined. The convective heat transfer and pressure loss in the cube cell under different mass flow rates were examined. The outcomes were contrasted and examined using both the conventional spherical simple cubic packing structure (SC) and the body-centered cubic packing structure (BCC). The results demonstrate that when the mass flow rate is less than 0.0018 kg/s, the heat transfer coefficient of the cube cell is slightly lower than BCC, but considerably higher than SC; When the mass flow rate is larger than 0.0018 kg/s, the heat transfer coefficient of the cube cell increases rapidly, which is significantly higher than that of BCC and SC; With the increase of mass flow rate, its heat storage/release rate is gradually higher than that of BCC and SC. Fluid in the cubic cell experiences pressure drops that are always between SC and BCC, but they rise quickly when the fluid mass flow rate rises. By examining the comprehensive heat transfer performance, it is discovered that the comprehensive heat transfer performance of cube unit is obviously better than that of BCC, and its comprehensive heat transfer performance is the best when the mass flow rate is less than 0.0018 kg/s. A reference for the filler structure of a neatly packed bed, the entire research demonstrates that the cube cell created in this work has more complete benefits in both heat transfer speed and flow pressure drop.

Key words: packed bed heat storage, filler structure, cube cell, flow characteristics, heat exchange characteristics

中图分类号:

TK 124

廖丹, 胡章茂, 王唯, 田红, 宣艳妮, 陈冬林. 立方体填充料结构内换热与流动特性[J]. 储能科学与技术, 2023, 12(3): 676-684.

Dan LIAO, Zhangmao HU, Wei WANG, Hong TIAN, Yanni XUAN, Donglin CHEN. Research on heat transfer and flow characteristics of cubic fillers[J]. Energy Storage Science and Technology, 2023, 12(3): 676-684.

图/表 12

图 1

图 2

表 1

氧化铝物性参数"

密度ρ/(kg/m³)	定压比热容 $C p / [J / (k g · K)]$	导热系数 $λ / [W / (m · K)]$
3707	1300	1.3

表 1

图 3

图 4

图 5

图 6

图 7

图 8

图 9

图 10

图 11

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