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Investigation on effects of varying geometrical configurations on thermal hydraulics flow in a 3D corrugated pipe
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2021-08-25 , DOI: 10.1016/j.ijthermalsci.2021.107237
Ahmed Ramadhan Al-Obaidi 1
Affiliation  

In this numerical investigation, the flow behavior, pressure drop, and heat transfer enhancement for the fluid in a corrugated pipe with varying geometrical configurations arrangements by supporting the computational simulation technique are analyzed. Also, correlations expressions for friction factor (f) and Nusselt number (Nu) with different corrugated geometrical parameters are developed. The numerical modeling is applied using computational fluid dynamics (CFD), and flow field patterns with different structural parameters are predicted. The numerical simulation results are validated with available experimental data. The numerical approach combined with the varying qualitatively and quantitatively analysis are used. The computational investigations are carried out for a different range of Reynolds numbers (Re) with varying corrugated geometrical configurations, including corrugated pipe ratio (PCR) of 20, 40, 60, 80, and 100%, a number of the corrugated ring (NCR) of 2, 3 and 4 as well as the corrugated diameter ring (CDR) of 1, 2 and 3 mm respectively. The outcomes illustrate that as in similar Re number increases, the Nu number increases. When the corrugated geometrical increases, the mixing, and recirculation flow regions start to high rise along the corrugated pipe. Then the flow becomes more undisturbed near and closes to the corrugated rings, and hence the pressure drop (PD), Turbulent kinetic energy (TKE), and vorticity also increase. Moreover, as the PCR increases, the friction factor increases and the f for PCR of 100% is considerably higher than other models. The friction factor for PCR is higher than other models by about 7.05, 24.3, 40.7, and 67.1%. Furthermore, the performance evaluation factor is greater than unity.



中文翻译:

研究不同几何配置对 3D 波纹管中热工水力流动的影响

在此数值研究中,通过支持计算模拟技术,分析了具有不同几何配置布置的波纹管中流体的流动行为、压降和传热增强。此外,摩擦系数 (f) 和 Nusselt 数 ( Nu) 具有不同的波纹几何参数。使用计算流体动力学 (CFD) 应用数值建模,并预测具有不同结构参数的流场模式。数值模拟结果得到了可用实验数据的验证。使用数值方法与不同的定性和定量分析相结合。对具有不同波纹几何结构的不同雷诺数 (Re) 范围进行了计算研究,包括 20、40、60、80 和 100% 的波纹管比率 (PCR),许多波纹环 (NCR) ) 2、3 和 4 以及波纹直径环 (CDR) 分别为 1、2 和 3 毫米。结果表明,随着相似 Re 数的增加,Nu数量增加。当波纹几何形状增加时,混合和再循环流动区域开始沿着波纹管升高。然后流动在波纹环附近变得更加不受干扰,因此压降 (PD)、湍流动能 (TKE) 和涡度也增加。此外,随着 PCR 的增加,摩擦系数也增加,100% 的 PCR 的 f 明显高于其他模型。PCR 的摩擦系数比其他型号高约 7.05、24.3、40.7 和 67.1%。此外,性能评价因子大于1。

更新日期:2021-08-26
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