Influence of flat tube aspect ratio on melting characteristics of phase change material within a double-tube unit

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2025-02-16 DOI:10.1016/j.csite.2025.105892

Gwan Gyu Kim , Chan Woo An , Young Min Seo , Seokho Kim , Hoon Ki Choi , Yong Gap Park

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Abstract

In this study, a numerical analysis was performed to investigate how the aspect ratio of flat tubes in a double-tube latent thermal energy storage system affects the melting behavior and thermal transfer properties of N-eicosane. To simulate the melting characteristics of the systems, the enthalpy–porosity method was employed. The aspect ratios of flat tubes in the inner and outer configurations significantly affected the melting characteristics. A smaller aspect ratio of the inner flat tube (AR_i) increased natural convection, resulting in a decreased total melting time. Conversely, a larger aspect ratio of the outer flat tube (AR_o) decreased the amount of solid PCM remaining, which also contributed to a shorter total melting time. For instance, in case 13, the total melting time was 1223.5 s, which represents a 59.3 % reduction compared with case 46, i.e., the base case with circular double tubes. The mean power in case 13 was 261.2 W, which corresponded to an increase of 146.08 % compared with the base case. Furthermore, at the optimal performance of AR_o = 1.8, correlation equations for total melting time and mean power were derived to assess the influence of AR_i regarding the melting process of systems.

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扁管长宽比对双管单元内相变材料熔化特性的影响

本文通过数值模拟研究了双管潜热储能系统中扁平管的宽高比对n -廿烷熔融行为和传热性能的影响。为了模拟体系的熔融特性，采用了焓孔法。内、外两种构型扁管的长径比对熔化特性有显著影响。较小的内扁管（ARi）宽高比增加了自然对流，导致总熔化时间缩短。相反，较大的外扁管（ARo）宽高比减少了固体PCM的剩余量，这也有助于缩短总熔化时间。例如，在情况13中，总熔化时间为1223.5 s，与情况46（即圆形双管的基本情况）相比，减少了59.3%。案例13的平均功率为261.2 W，与基本案例相比增加了146.08%。此外，在ARo = 1.8的最优性能下，导出了总熔化时间与平均功率的相关方程，以评估ARi对体系熔化过程的影响。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.