Regulating Melting Process in the Energy Storage of Solid-Liquid PCM based on Double MRT-LBM Simulation  

作　　者：CHEN Weiqi SONG Zhichao QUAN Dongliang HE Yurong 

机构地区：[1]School of Energy Science&Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Heilongjiang Key Laboratory of New Energy Storage Materials and Processes,Harbin 150001,China [3]Zhengzhou Research Institute of Harbin Institute of Technology,Zhengzhou 450000,China [4]Innovation&Research Institute of Hiwing Technology Academy,Beijing 100074,China

出　　处：《Journal of Thermal Science》2024年第5期1688-1700,共13页热科学学报（英文版）

基　　金：financially supported by Natural Science Foundation of Heilongjiang Province(Grant No.ZD2021E002)。

摘　　要：The melting process of solid-liquid phase change materials(PCM)has a significant impact on their energy storage performance.To more effectively apply solid-liquid PCM for energy storage,it is crucial to study the regulation of melting process of solid-liquid PCM,which is numerically investigated based on double multiple relaxation time lattice Boltzmann method(MRT-LBM)in this work.In this work we pay more attention to the effects of different Stefan numbers(Ste)and Rayleigh numbers(Ra)on the melting process.The results indicate that the PCM melting is greatly influenced by the Ste number and Ra number,which can be divided into the heat conduction dominant stage and the convection dominant stage,according to the onset time of convection Fo_(C).In order to describe the contribution of the heat conduction dominant stage to the whole melting process quantitatively,we firstly propose the ratio of the heat conduction dominant stage R_(pc),which can be defined as the ratio of Fo_(C)to the complete melting time Fo_(M).R_(pc)gradually decreases as the Ra number increases,and when the Ste number rises:R_(pc)=90.0%when Ste=1.0 and Ra=1×10^(5),R_(pc)=39.6%when Ste=0.1 and Ra=1×10^(5),and R_(pc)=14.0%when Ste=1.0 and Ra=1×10~7.A regime map about the effects of different Ste numbers and Ra numbers on R_(pc)has been further summarized.The discovered findings would be helpful in regulating melting process in the energy storage of solid-liquid PCM.

关 键 词：latent thermal energy storage solid-liquid phase change double MRT-LBM dominant melting mechanism 

分 类 号：TK11[动力工程及工程热物理—热能工程]