多孔介质结构对储层内流动和换热特性的影响

doi:10.16085/j.issn.1000-6613.2022-1833

化工进展 ›› 2023, Vol. 42 ›› Issue (8): 4212-4220.DOI: 10.16085/j.issn.1000-6613.2022-1833

多孔介质结构对储层内流动和换热特性的影响

汪健生¹(), 张辉鹏¹^,², 刘雪玲¹^,²(), 傅煜郭¹^,², 朱剑啸¹^,²

^1.中低温热能高效利用教育部重点实验室，天津大学，天津 300350
^2.天津大学机械工程学院地热研究培训中心，天津 300350

收稿日期:2022-09-30 修回日期:2022-12-02 出版日期:2023-08-15 发布日期:2023-09-19
通讯作者: 刘雪玲
作者简介:汪健生（1964—），男，博士，教授，研究方向为强化传热、热管技术等。E-mail：jsw@tju.edu.cn。

Analysis of flow and heat transfer characteristics in porous media reservoir

WANG Jiansheng¹(), ZHANG Huipeng¹^,², LIU Xueling¹^,²(), FU Yuguo¹^,², ZHU Jianxiao¹^,²

^1.Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Tianjin University, Tianjin 300350, China
^2.Geothermal Research & Training Center, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China

Received:2022-09-30 Revised:2022-12-02 Online:2023-08-15 Published:2023-09-19
Contact: LIU Xueling

摘要/Abstract

摘要：

针对含水层储能对选址的要求高且存在地下水污染的问题，提出了构建人工填充储层进行储能，并对储层内的局部流动和换热特性进行了研究。采用共轭传热模型分别对填充非均匀颗粒、十二面体梯度开孔和二十面体梯度开孔结构3种多孔介质孔隙内的流动和换热进行了直接数值模拟，对比分析了多孔介质结构对流动和换热特性的影响。研究发现，通过选择合适的填充介质，储层内的综合换热性能能够得到改善，3种多孔介质中十二面体梯度开孔多孔介质的总换热效率（η）最高；非均匀颗粒多孔介质的平均努塞尔数（Nu_sf）最大，但同时单位压降（∆p/∆x）与摩擦系数（f）也最大；十二面体梯度开孔多孔介质和二十面体梯度开孔多孔介质的Nu_sf随雷诺数（Re）的变化存在交叉，在Re较小时二十面体梯度开孔结构的Nu_sf较大，Re较大时十二面体梯度开孔结构的Nu_sf较大。

关键词: 含水层储能, 人工储层, 对流换热, 多孔介质传热

Abstract:

Focusing on the problem of high requirements for site selection and groundwater pollution in aquifer energy storage, the construction of artificially filled underground reservoir for energy storage was proposed, and the local flow and heat transfer characteristics in underground reservoir were studied. The conjugate heat transfer model was used to simulate the flow and heat transfer in three kinds of porous media filled with non-uniform particle structure, dodecahedral gradient opening structure and icosahedral gradient opening structure, respectively. The effect of porous media structure on flow and heat transfer characteristics were compared and analyzed. The results indicated that comprehensive heat transfer performance in underground reservoir can be improved by selecting the appropriate filling structure. Among three kinds of porous media, the comprehensive heat transfer efficiency of dodecahedral gradient porous media was the highest. The average Nusselt number of porous media filled with non-uniform particle structure was the largest, but at the same time, the unit pressure drop and friction coefficient were also the largest. With the change of Reynolds number, the Nusselt number of dodecahedral gradient opening structure and icosahedral gradient opening structure intersected. The Nusselt number of icosahedral gradient porous media was larger when Reynolds number was smaller, and the Nusselt number of dodecahedral gradient porous media was larger when Reynolds number was larger.

Key words: aquifer energy storage, artificial reservoir, convective heat transfer, heat transfer in porous media

中图分类号:

TK52

汪健生, 张辉鹏, 刘雪玲, 傅煜郭, 朱剑啸. 多孔介质结构对储层内流动和换热特性的影响[J]. 化工进展, 2023, 42(8): 4212-4220.

WANG Jiansheng, ZHANG Huipeng, LIU Xueling, FU Yuguo, ZHU Jianxiao. Analysis of flow and heat transfer characteristics in porous media reservoir[J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4212-4220.

图/表 14

图1 不同多孔介质储层的物理模型

表1 3种多孔介质填充通道的几何尺寸

多孔介质通道	X/mm	Y/mm	Z/mm
非均匀颗粒	3.9	3.7	1.2
十二面体开孔	8.3	2.6	2.6
二十面体开孔	5.3	1.6	1.6

表2 多孔介质骨架材料的物性参数

物性参数	数值
密度/kg·m^-3	1800
热导率/W·m^-1·K^-1	2.5
定压比热容/J·kg^-1·K^-1	2600

表3 非均匀颗粒多孔介质在不同网格数下的流体出口温度（Re=1, Tw=290.65K）

项目	网格1	网格2	网格3	网格4
网格数量	332295	441675	549763	623159
流体出口温度/K	290.605564	290.604886	290.604165	290.603912

表4 不同多孔介质模型的网格数

填充结构	总网格数
非均匀球	623159
十二面体梯度开孔	1386996
二十面体梯度开孔	1423736

图2 Romkes等所使用的物理模型

图3 计算结果与Romkes等实验以及模拟结果的对比

图4 不同多孔介质结构下的截面速度分布和空间流线分布（Re=1, Tw=318.15K）

图5 不同结构和壁面温度下单位压降随Re的变化

图6 不同结构和壁面温度下摩擦系数随Re的变化

图7 不同多孔介质结构下x-y中心截面和距入口0.55mm处y-z截面的温度分布（Re=1，Tw=318.15K）

图8 不同多孔介质与壁面温度下hsf随Re的变化

图9 不同多孔介质与壁面温度下Nusf随Re的变化

图10 不同多孔介质结构和壁面温度下η随Re的变化

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多孔介质结构对储层内流动和换热特性的影响

Analysis of flow and heat transfer characteristics in porous media reservoir

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