An in-depth numerical and experimental analysis of wire coil inserts: enhancing thermal performance and fluid flow characteristics in double pipe heat exchangers

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
Brajesh Kumar Ahirwar, Arvind Kumar
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Abstract

This study investigates the heat transfer, thermal hydraulic performance, and entropy generation of turbulent flow in a horizontal double pipe heat exchanger. The heat exchanger is integrated with wire coil inserts, featuring various combinations of pitch ratios (P/Dc) and wire diameters (d), using numerical analysis. The RNG k-ε model and the finite volume technique have been utilized to solve the equations, and experimental data from published studies have been used to validate three-dimensional simulations. The computational findings have been obtained for a range of Reynolds numbers (Re) 5500 ≤ Re ≤ 11,500 using three different types of wire diameter (d = 1 mm, d = 1.5, and d = 2 mm) and pitch ratios P/Dc in the range of (3.125–0.625) for a heat flux of 5000 W m-2. The effect of these parameters on the Nusselt number, friction factor (ƒ), entropy generation number, and thermal performance factor (TPF) are investigated and compared with those of plain pipe under similar conditions. The incorporation of wire coil inserts significantly improves fluid mixing by creating a swirling flow pattern. The Nusselt number showed its highest enhancement at 111.11%, coupled with a substantial 347.8% increase in friction factor penalty with P/Dc = 0.625 and d = 2 mm at the highest Re as compared to plain tube. The highest value of the TPF recorded during the investigation was 1.36, observed at P/Dc = 0.625 and d = 2 mm, with a Re of 5500. This study also compares numerical results with experimental findings, revealing variations within a range of ± 10%.

深入的数值和实验分析线圈插入:提高热交换器的热性能和流体流动特性
本文研究了卧式双管换热器内紊流的传热、热工性能和熵产。热交换器集成了线圈插入,采用数值分析,具有各种螺距比(P/Dc)和线径(d)的组合。利用RNG k-ε模型和有限体积技术来求解方程,并利用已发表研究的实验数据来验证三维模拟。在热流密度为5000 W m-2时,采用三种不同的线径(d = 1 mm、d = 1.5和d = 2 mm)和节距比P/Dc在(3.125 ~ 0.625)范围内,得到雷诺数(Re) 5500≤Re≤11500的计算结果。研究了这些参数对Nusselt数、摩擦系数(f)、熵产数和热性能因子(TPF)的影响,并与同等条件下的普通管道进行了比较。通过创建旋转流动模式,线圈插入的结合显着改善了流体混合。与普通管相比,当P/Dc = 0.625和d = 2 mm时,最高Re时,Nusselt数的最大增强为111.11%,摩擦系数惩罚增加了347.8%。在P/Dc = 0.625和d = 2 mm时,TPF值最高,为1.36,Re为5500。该研究还将数值结果与实验结果进行了比较,揭示了±10%范围内的变化。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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