Experimental investigation on air-side heat transfer and flow characteristics of longitudinal compact arrangement tube bundle with various transverse pitch ratios

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-05-30 DOI:10.1016/j.ijheatmasstransfer.2025.127297

Yangjia Qin , Jie Wen , Guoqiang Xu , Zhiwei Liu , Laihe Zhuang

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引用次数: 0

Abstract

The longitudinal compact arrangement (LCA) tube bundle shows great potential for advanced compact heat exchangers, with its excellent properties of low flow resistance and compactness. However, the lack of specific performance data and reliable empirical correlations hinders its practical application. This study experimentally investigates the airside heat transfer (Nusselt number, Nu) and flow resistance (friction factor, f) characteristics of LCA tube bundles across a wide range of transversal pitch ratios (S₁/D = 1.521 to 8.621) for Reynolds numbers (Re) from 1000 to 10,000. The novelty of this study lies in developing the first comprehensive set of empirical correlations specifically for LCA tube bundles; these correlations are validated against experimental data with predicted deviations under 10 % for Nu and 15 % for f. Key findings reveal that while LCA tube bundles exhibit moderately lower Nu compared to typical inline tube bundles, they achieve significantly lower friction factors. Consequently, a comparative analysis using the Colburn j-factor to friction factor ratio (j/f) shows the overall thermal-hydraulic performance (j/f) of the LCA tube bundle is 1.2 to 2.65 times greater than that of typical inline tube bundles, primarily attributed to its ultralow flow resistance characteristics. This research provides crucial, validated design tools and quantitatively demonstrates the superiority of the LCA tube bundles for applications prioritizing low pressure drop alongside effective heat transfer, facilitating the design of ultralow flow resistance compact heat exchangers.

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不同横向节距比纵向密实布置管束空气侧换热及流动特性的实验研究

纵向紧凑式管束以其低流动阻力和紧凑性等优点，在先进的紧凑式换热器中具有很大的应用潜力。然而，缺乏具体的性能数据和可靠的经验相关性阻碍了其实际应用。本研究通过实验研究了雷诺数（Re）为1000 ~ 10000时，LCA管束在宽横向节距比（S1/D = 1.521 ~ 8.621）范围内的空侧传热（努塞尔数Nu）和流动阻力（摩擦系数f）特性。本研究的新颖之处在于开发了第一套专门针对LCA管束的综合经验相关性；这些相关性通过实验数据得到验证，Nu的预测偏差小于10%，f的预测偏差小于15%。主要发现表明，与典型的内联管束相比，LCA管束的Nu值略低，但摩擦系数明显较低。因此，使用Colburn j-factor / friction factor ratio （j/f）进行的对比分析表明，LCA管束的整体热工性能（j/f）是典型直列管束的1.2 ~ 2.65倍，这主要归功于其超低流阻特性。这项研究提供了关键的、经过验证的设计工具，并定量地证明了LCA管束的优越性，适用于优先考虑低压降和有效传热的应用，促进了超低流阻紧凑型换热器的设计。

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

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