基于LBM的多孔介质无机复合相变材料储能特性

doi:10.19799/j.cnki.2095-4239.2022.0427

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (1): 61-68.doi: 10.19799/j.cnki.2095-4239.2022.0427

基于LBM的多孔介质无机复合相变材料储能特性

崔婷婷(), 王燕()

南京工业大学机械与动力工程学院，江苏南京 211816

收稿日期:2022-07-29 修回日期:2022-08-30 出版日期:2023-01-05 发布日期:2023-02-08
通讯作者: 王燕 E-mail:1834106811@qq.com;wemma7@gmail.com
作者简介:崔婷婷（1995—），女，硕士研究生，研究方向为相变储能，E-mail：1834106811@qq.com；
基金资助:
江苏省自然科学基金面上项目(BK20201364);江苏省高校自然科学研究重大项目（A类）(18KJA480003)

Energy storage characteristics of porous inorganic composite phase-change materials based on the Lattice Boltzmann Method

Tingting CUI(), Yan WANG()

School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China

Received:2022-07-29 Revised:2022-08-30 Online:2023-01-05 Published:2023-02-08
Contact: Yan WANG E-mail:1834106811@qq.com;wemma7@gmail.com

摘要/Abstract

摘要：

为了研究骨架形貌对无机复合相变材料(CPCM)相变储能特性的影响，基于格子玻尔兹曼方法，采用四参数随机生长法(QSGS)构造多孔介质骨架，建立随机分布的多孔介质CPCM相变模型，在此基础上，探究孔隙度(ε)、固相生长核分布概率(P_c)、方向生长概率(P_d)、瑞利数(Ra)对CPCM相变储能特性的影响。结果表明，ε越小，CPCM熔化时间越短，ε为0.70时的完全熔化时间相较于ε为0.90时缩短了23.63%。在相同ε(0.90)下，P_c增大或P_d减小，都有助于提高CPCM的熔化速度。Ra越大，自然对流强度越大，CPCM所需熔化时间越短，Ra为18000时CPCM所需熔化时间相较于Ra为1000时缩短了41.46%。本工作为研究多孔介质无机CPCM储能特性提供理论依据和参考。

关键词: 格子玻尔兹曼, 多孔介质, 四参数随机生长法, 相变储能

Abstract:

The effect of skeleton morphology on the energy storage characteristics of inorganic composite phase change materials (CPCM) was studied. The quartet structure generation set was used to construct the porous media based on the Lattice Boltzmann Method. The CPCM phase transformation model with a randomly distributed porous medium was developed in line with this. On this basis, the influences of porosity (ε), solid growth core distribution probability (P_c), directional growth probability (P_d), and Rayleigh number (Ra) on CPCM energy storage characteristics were studied. The results show that the melting time of CPCM decreases as ε decreases. The total melting time of CPCM when ε is 0.70 was 23.63% less than that of 0.90. The increasing of the P_c and the decreasing of the P_d can improve the melting rate of CPCM under the same ε (0.90). The total melting time of CPCM decreases with the increase of Ra because the increase of Ra increases the intensity of natural convection. And the total melting time of CPCM when Ra is 18000 is 41.46% less than that of 1000. This study offers a theoretical foundation and a reference point for the energy storage properties of inorganic porous medium CPCM.

Key words: Lattice Boltzmann Method, porous medium, quartet structure generation set, phase change energy storage

中图分类号:

TK 02

崔婷婷, 王燕. 基于LBM的多孔介质无机复合相变材料储能特性[J]. 储能科学与技术, 2023, 12(1): 61-68.

Tingting CUI, Yan WANG. Energy storage characteristics of porous inorganic composite phase-change materials based on the Lattice Boltzmann Method[J]. Energy Storage Science and Technology, 2023, 12(1): 61-68.

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物性参数	CaCl₂·6H₂O	多孔骨架
相变点/℃	29.9	—
密度/(kg/m³)	1710	900
热膨胀系数/K^-1	3.5×10^-4	—
导热系数/[W/(m·K)]	0.567	5.67
动力黏度/[kg/(m·s)]	3.26×10^-3	—
比热容/[J/(g·K)]	1.45	700
潜热/(J/g)	190	—

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基于LBM的多孔介质无机复合相变材料储能特性

Energy storage characteristics of porous inorganic composite phase-change materials based on the Lattice Boltzmann Method

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