دورية أكاديمية
Experimental Investigation on the Perturbation Length for Air–Water Flow Upstream and Downstream of U-Bends
العنوان: | Experimental Investigation on the Perturbation Length for Air–Water Flow Upstream and Downstream of U-Bends |
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المؤلفون: | Xiaoxu Ma, Taicheng Liu, Nan Dai, Maocheng Tian, Shijie Li |
المصدر: | Frontiers in Energy Research, Vol 10 (2022) |
بيانات النشر: | Frontiers Media S.A. |
سنة النشر: | 2022 |
المجموعة: | Directory of Open Access Journals: DOAJ Articles |
مصطلحات موضوعية: | two-phase flow, air–water flow, U-bend, perturbation length, pressure gradient, General Works |
الوصف: | In this work, the perturbation length of vertical U-bend effects on the air–water two-phase flow in their adjacent straight tubes was investigated experimentally at ambient pressure and temperature. The experimental database covered test sections with three inner diameters of U-tubes (9, 12, and 16 mm), two curvature ratios (8.33 and 12.5), and two orientations (downward and upward). The air and water superficial velocities varied from 0.18 to 25.11 m/s and from 0.11 to 1.98 m/s, respectively. The dissipation of U-bend effects in the regions upstream and downstream of U-bends is characterized by the variation regularities of segmental pressure gradients along the contiguous straight tubes. It was found that the significant value of the dimensionless perturbation length (Lp/D) is less than 60 for the experimental conditions in this study. The influences of the inlet volume void fraction, two-phase mixed Froude number, mixed Weber number, and mixed Dean number on dimensionless perturbation length (Lp/D) are similar. With the increase in these parameters, Lp/D presents a unimodal distribution which first increases and then decreases. The maximum value of Lp/D takes place at a volume void fraction of around 90%. New dimensionless correlations to predict the influence length of U-bends on the straight tubes upstream and downstream have been provided. The prediction errors of 80% of data are within ± 30% compared with the present experimental data. |
نوع الوثيقة: | article in journal/newspaper |
اللغة: | English |
تدمد: | 2296-598X |
العلاقة: | https://www.frontiersin.org/articles/10.3389/fenrg.2022.906809/fullTest; https://doaj.org/toc/2296-598XTest; https://doaj.org/article/d607fc50812e465aba02b16bd7b40551Test |
DOI: | 10.3389/fenrg.2022.906809 |
الإتاحة: | https://doi.org/10.3389/fenrg.2022.906809Test https://doaj.org/article/d607fc50812e465aba02b16bd7b40551Test |
رقم الانضمام: | edsbas.41905D27 |
قاعدة البيانات: | BASE |
تدمد: | 2296598X |
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DOI: | 10.3389/fenrg.2022.906809 |