Comprehensive application analyses of elastic models and viscoelastic models intransient flows in polymeric pipelines

Xiangyu Duan; Jianghui Zhu; Xiaoqin LiXuelin Tang

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Comprehensive application analyses of elastic models and viscoelastic models intransient flows in polymeric pipelines

机译：Comprehensive application analyses of elastic models and viscoelastic models intransient flows in polymeric pipelines

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Based on the MOC (Method of Characteristics), the applicabilities of both the elastic models of the SF (Steady Friction), the CB-UF (Convolu-tion-Based Unsteady Friction) and the MIAB-UF (Modified instantaneous Acceleration-Based UF), and the viscoelastic models of the SF-VE(SF-Viscoelasticity), the CB-UF-VE (Convolution-Based Unsteady Friction-Viscoelasticity) and the MIAB-UF-VE (Modified Instantaneous Accel-eration-Based UF-Viscoelasticity), are investigated for hydraulic transients induced by a downstream rapid valve closure in a polymericpipeline. The predicted results by the elastic models are very different from the experimental data, whereas the predicted pressure peaksand phases by the viscoelastic models agree well with the experimental data because considering the pipe-wall creep effect, the CB-UF-VE and the MIAB-UF-VE generate better results than the SF-VE. The creep effects near the first pressure peak are captured well by the visco-elastic models. The analyses of the contributions of different factors to pressure attenuation show that for transient flows in polymericpipelines, the effect of VE is greater than that of the CB-UF and MIAB-UF. The spectrum analyses show that the pressure amplitudes andharmonic frequencies by the elastic models match badly with the experimental data, whereas those by the viscoelastic models matchwell with the experimental data. The harmonic frequencies by the MIAB-UF-VE are the best, followed by the CB-UF-VE, and are worst bythe SF-VE.

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《Journal of hydroinformatics》 |2022年第6期|1020-1052|共33页
作者
Xiangyu Duan; Jianghui Zhu; Xiaoqin LiXuelin Tang;
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作者单位

College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;

College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China, Beijing Engineering Research Centre of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing 1000;

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收录信息美国《科学引文索引》(SCI);
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正文语种英语
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Key words: harmonic frequency; pressure attenuation; retarded strain; unsteady friction; viscoelasticity; transient flows;

Comprehensive application analyses of elastic models and viscoelastic models intransient flows in polymeric pipelines

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