Numerical investigation on thermal efficiency and resistance of high-temperature thermosiphons using dimensionless method

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-06-04 DOI:10.1016/j.csite.2025.106391

Haojie Zhang , Zhuqian Zhang , Lixin Yang , Yueyi Li , Heyao Li , Yuchen Zhou

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引用次数: 0

Abstract

Exploring the thermal characteristics of high-temperature heat pipes (HTHPs) requires a detailed analysis of how each parameter affects their heat transfer efficiency. The hydrodynamic and thermophysical properties of working fluids flow are related to structural parameters of HTHPs, and some variables are combined into dimensionless numbers by means of rational physical relationships. Analyzing the thermal behavior of HTHPs using dimensionless numbers provides certain advantages over a straightforward parametric approach. In this study, a theoretical model of the high-temperature thermosiphon (HTT) is developed based on the heat transfer mechanisms inherent in its operation. By establishing differential equations and substituting some experimental data, the numerical calculation is made in the MATLAB codes. The computational results are utilized to assess the influence of the length-diameter ratio, Bond number, and Jakob number on the thermal performance of the HTTs. The correlation between the structural and thermophysical characteristics of HTTs is ascertained by investigating the circulation of working fluid. Utilizing this correlation, three dimensionless numbers M₁, M₂, and M₃ are derived. The effect of these dimensionless numbers on the thermal performance is further clarified by the computational analysis. It is found that three dimensionless numbers are effective for guiding the analysis of the thermal performance, a smaller M₃ number contributes to enhancing the heat transfer efficiency of the HTTs.

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高温热虹吸管热效率和电阻的无量纲法数值研究

探索高温热管（HTHPs）的热特性需要详细分析每个参数如何影响其传热效率。工质流动的流体力学和热物理性质与高温高压油泵的结构参数有关，并通过合理的物理关系将一些变量组合为无因次数。与直接的参数化方法相比，使用无因次数分析高温高压泵的热行为具有一定的优势。本文基于高温热虹吸的传热机理，建立了高温热虹吸的理论模型。通过建立微分方程，代入部分实验数据，在MATLAB代码中进行数值计算。利用计算结果评估了长径比、Bond数和Jakob数对高温超导热性能的影响。通过对工作流体循环的研究，确定了高温高压储层的结构特征与热物理特征之间的相关性。利用这种相关性，可以推导出三个无维数M1、M2和M3。计算分析进一步阐明了这些无量纲数对热工性能的影响。研究发现，三维无量纲数可以有效地指导热工性能的分析，M3数越小，传热效率越高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.