Kun Wang , Bao-Lei Wang , Yuan Li , Xiao-Dong Wang , Chun-Hua Min , Zhong-Hao Rao
{"title":"利用梯度磁场调节 Fe3O4-石蜡复合材料潜热储存过程的数值研究","authors":"Kun Wang , Bao-Lei Wang , Yuan Li , Xiao-Dong Wang , Chun-Hua Min , Zhong-Hao Rao","doi":"10.1016/j.ijheatmasstransfer.2024.125874","DOIUrl":null,"url":null,"abstract":"<div><p>Serving as the regulatable external force, the magnetic nanoparticles induced force inside the magnetic field can be an efficient way to handle the heat storage of phase change materials. The deep understanding on the relation between the thermomagnetic convection and externally applied gradient magnetic field is no doubt essential. In this paper, the impacts of gradient magnetic field on the melting process of Fe<sub>3</sub>O<sub>4</sub>-paraffin wax composite phase change materials are identified through a numerical simulation. Particularly, the effects of some key parameters of nanoparticle concentration, heating surface temperature, and gradient magnetic field strength on the heat storage performance of phase change materials are discussed in depth. It is found that the angle (<em>θ</em>) between the volumetric force and the normal direction of the heating surface dominates the phase change heat storage effect in the cavity. Compared to the case with only gravity-force (<em>θ</em> = 90°), the cases with <em>θ</em> larger than 90° can enhance the phase change heat storage process, while those with <em>θ</em> less than 90° weakens it. Note that when the magnetic field gradient is in the same direction as the heat transfer direction, the heat storage performance of the phase change material decreases and vice versa increases. Moreover, the increase of heating surface temperature, nanoparticle concentration, and magnetic field strength can positively accelerate the heat storage process. The gradient magnetic field of 0.8 and -0.8 T·m<sup>−1</sup> would decrease and increase the specific volume heat storage power by 26.49 % and 29.04 % in sequence, compared to the no magnetic field case.</p></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":5.0000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A numerical study on regulating the latent heat storage process of Fe3O4-paraffin wax composite materials by using gradient magnetic field\",\"authors\":\"Kun Wang , Bao-Lei Wang , Yuan Li , Xiao-Dong Wang , Chun-Hua Min , Zhong-Hao Rao\",\"doi\":\"10.1016/j.ijheatmasstransfer.2024.125874\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Serving as the regulatable external force, the magnetic nanoparticles induced force inside the magnetic field can be an efficient way to handle the heat storage of phase change materials. The deep understanding on the relation between the thermomagnetic convection and externally applied gradient magnetic field is no doubt essential. In this paper, the impacts of gradient magnetic field on the melting process of Fe<sub>3</sub>O<sub>4</sub>-paraffin wax composite phase change materials are identified through a numerical simulation. Particularly, the effects of some key parameters of nanoparticle concentration, heating surface temperature, and gradient magnetic field strength on the heat storage performance of phase change materials are discussed in depth. It is found that the angle (<em>θ</em>) between the volumetric force and the normal direction of the heating surface dominates the phase change heat storage effect in the cavity. Compared to the case with only gravity-force (<em>θ</em> = 90°), the cases with <em>θ</em> larger than 90° can enhance the phase change heat storage process, while those with <em>θ</em> less than 90° weakens it. Note that when the magnetic field gradient is in the same direction as the heat transfer direction, the heat storage performance of the phase change material decreases and vice versa increases. Moreover, the increase of heating surface temperature, nanoparticle concentration, and magnetic field strength can positively accelerate the heat storage process. The gradient magnetic field of 0.8 and -0.8 T·m<sup>−1</sup> would decrease and increase the specific volume heat storage power by 26.49 % and 29.04 % in sequence, compared to the no magnetic field case.</p></div>\",\"PeriodicalId\":336,\"journal\":{\"name\":\"International Journal of Heat and Mass Transfer\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.0000,\"publicationDate\":\"2024-07-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Heat and Mass Transfer\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0017931024007051\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0017931024007051","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
A numerical study on regulating the latent heat storage process of Fe3O4-paraffin wax composite materials by using gradient magnetic field
Serving as the regulatable external force, the magnetic nanoparticles induced force inside the magnetic field can be an efficient way to handle the heat storage of phase change materials. The deep understanding on the relation between the thermomagnetic convection and externally applied gradient magnetic field is no doubt essential. In this paper, the impacts of gradient magnetic field on the melting process of Fe3O4-paraffin wax composite phase change materials are identified through a numerical simulation. Particularly, the effects of some key parameters of nanoparticle concentration, heating surface temperature, and gradient magnetic field strength on the heat storage performance of phase change materials are discussed in depth. It is found that the angle (θ) between the volumetric force and the normal direction of the heating surface dominates the phase change heat storage effect in the cavity. Compared to the case with only gravity-force (θ = 90°), the cases with θ larger than 90° can enhance the phase change heat storage process, while those with θ less than 90° weakens it. Note that when the magnetic field gradient is in the same direction as the heat transfer direction, the heat storage performance of the phase change material decreases and vice versa increases. Moreover, the increase of heating surface temperature, nanoparticle concentration, and magnetic field strength can positively accelerate the heat storage process. The gradient magnetic field of 0.8 and -0.8 T·m−1 would decrease and increase the specific volume heat storage power by 26.49 % and 29.04 % in sequence, compared to the no magnetic field case.
期刊介绍:
International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems.
Topics include:
-New methods of measuring and/or correlating transport-property data
-Energy engineering
-Environmental applications of heat and/or mass transfer