Thermal performance analysis of coils versus longitudinal C-shaped tubes: validity of the turbulent correlations

3区物理与天体物理 Q1 Engineering

Waves in Random and Complex Media Pub Date : 2023-11-02 DOI:10.1080/17455030.2023.2276730

Kamel Cheriet, Yassine Demagh, El Wardi Bitam, Farid Berrahil

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Abstract

AbstractCompared to helically coiled tube exchangers (HCTs), longitudinally curved tube exchangers (LCTs) have received little attention from scientists over the past decade, leading to a lack of correlations estimating the Nusselt number and friction factor. In view of recent studies promoting the use of LCTs (waved, C-shaped or sinusoidal) in linear solar concentrating systems, this study examines whether or not correlations of and developed explicitly for HCTs could be applied to LCTs. A (SST) turbulent model has been run on HCTs and validated by experimental correlations from the literature. With an amplitude ratio equal to unity (waviness amplitude to the curvature radius ratio) and the same curvature ratio (tube radius to the curvature radius ratio), LCTs and HCTs are geometrically similar. For these similar configurations, the numerical results of over the Reynolds number range overlap almost perfectly, which is not for. Over the LTC amplitude ratio range, no significant change in the mean was reported, with a max relative error of 3.98%, whereas was highly dependent on it. One key finding: with a similar curvature ratio, correlations of the mean developed previously for HCTs could be used for LCTs, which is not valid for the mean.KEYWORDS: Nusselt numberfriction factorhelically coiled tubelongitudinally C-curved tubesimilaritiesnumerical simulation Disclosure statementNo potential conflict of interest was reported by the author(s).

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盘管与纵向c形管的热性能分析:湍流相关性的有效性

摘要与螺旋螺旋管交换器相比，纵向弯曲管交换器在过去的十年中很少受到科学家的关注，导致努塞尔数和摩擦因数的相关性估计缺乏。鉴于最近的研究促进了线性太阳能聚光系统中lct(波浪型、c型或正弦型)的使用，本研究探讨了hct的相关性和明确发展的相关性是否可以应用于lct。在hct上运行了一个(SST)湍流模型，并通过文献中的实验相关性进行了验证。当幅值比等于1(波纹幅值与曲率半径比)和曲率比相同(管半径与曲率半径比)时，lct和hct在几何上是相似的。对于这些相似的构型，在雷诺数范围内的数值结果几乎完全重合，这是不适用的。在LTC振幅比范围内，平均值没有显著变化，最大相对误差为3.98%，但高度依赖于它。一个关键的发现是:在曲率比相似的情况下，先前为hct建立的平均值相关性可以用于lct，这对平均值无效。关键词:努塞尔数摩擦因子螺旋卷曲管属c弯曲管相似度数值模拟披露声明作者未报告潜在利益冲突。

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来源期刊

Waves in Random and Complex Media 物理-物理：综合

自引率

0.00%

发文量

677

审稿时长

3.0 months

期刊介绍： Waves in Random and Complex Media (formerly Waves in Random Media ) is a broad, interdisciplinary journal that reports theoretical, applied and experimental research related to any wave phenomena. The field of wave phenomena is all-pervading, fast-moving and exciting; more and more, researchers are looking for a journal which addresses the understanding of wave-matter interactions in increasingly complex natural and engineered media. With its foundations in the scattering and propagation community, Waves in Random and Complex Media is becoming a key forum for research in both established fields such as imaging through turbulence, as well as emerging fields such as metamaterials. The Journal is of interest to scientists and engineers working in the field of wave propagation, scattering and imaging in random or complex media. Papers on theoretical developments, experimental results and analytical/numerical studies are considered for publication, as are deterministic problems when also linked to random or complex media. Papers are expected to report original work, and must be comprehensible and of general interest to the broad community working with wave phenomena.