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Lin Li, David Z. Zhu and Biao Huang
Rapid filling/emptying of pipes is commonly encountered in water supply and sewer systems, during which pressure transients may cause unexpected large pressure and/or geyser events. In the present study, a linearized analytical model is first developed t...
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Widyo Ari Utomo,Agung Nugroho,Muslim Nugroho
Pág. HAL. 25 - 32
Seiring dengan perkembangan teknologi informasi telah melahirkan smartphone yang memiliki kemampuan seperti computer. Di dalam PAMSIMAS, samrtphone dapat memberikan kenyamanan atau kemudahan dalam monitoring penggunaan debit air pada masyarakat yang meng...
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Khaled Yousef, Ahmed Hegazy and Abraham Engeda
An experimental and numerical study is presented in the current work for gas entrainment using an inverted vertical U-tube. Water flows vertically up in an inverted U-tube which creates a low-pressure region in the tube upper portion. This low-pressure r...
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Oscar E. Coronado-Hernández, Vicente S. Fuertes-Miquel and Fredy N. Angulo-Hernández
Recently, emptying processes have been studied in experimental facilities in pipelines, but there is a lack regarding applications in actual pipelines, which permits establishing the risk of collapse because of sub-atmospheric pressure occurrence. This r...
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Wen Zhang, Fulin Cai, Jianxu Zhou and Yulong Hua
Diversion tunnels are often used as tailrace tunnels in underground hydropower stations. The special layout results in complex flow regimes, including air-water two-phase flow. A set of experiments is conducted based on the model of a hydropower station ...
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Wen Zhang, Fulin Cai, Jianxu Zhou, Yulong Hua
Pág. 1 - 14
Diversion tunnels are often used as tailrace tunnels in underground hydropower stations. The special layout results in complex flow regimes, including air-water two-phase flow. A set of experiments is conducted based on the model of a hydropower station ...
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Der-Chang Lo, Jin-Shuen Liou and Shyy Woei Chang
As an attempt to improve the performances of multi-entry gullies with applications to drainage system of a building, the hydrodynamic characteristics of air-water flows through the gullies with and without swirl generation vanes (SGV) are experimentally ...
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Der-Chang Lo, Shyy Woei Chang, Hsin-Feng Liu and Chao-Yan Chen
The miniaturization of a gully for building drainage system is attempted by installing a streamlined bump in the discharge pipe to maintain the minimum water trap height of 50 mm. The hydrodynamic performances of the air?water flows with or without glass...
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Der-Chang Lo, Shyy Woei Chang, Hsin-Feng Liu and Chao-Yan Chen
The miniaturization of a gully for building drainage system is attempted by installing a streamlined bump in the discharge pipe to maintain the minimum water trap height of 50 mm. The hydrodynamic performances of the air?water flows with or without glass...
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Daniel B. Bung and Daniel Valero
As with most high-velocity free-surface flows, stepped spillway flows become self-aerated when the drop height exceeds a critical value. Due to the step-induced macro-roughness, the flow field becomes more turbulent than on a similar smooth-invert chute....
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Azim Hosseini, Sasan Tavakoli, Abbas Dashtimanesh, Prasanta K. Sahoo and Mihkel Kõrgesaar
This paper presents CFD (Computational Fluid Dynamics) simulations of the performance of a planing hull in a calm-water condition, aiming to evaluate similarities and differences between results of different CFD models. The key differences between these ...
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Minquan Liao, Qiaorui Si, Meng Fan, Peng Wang, Zhonghai Liu, Shouqi Yuan, Qianglei Cui and Gérard Bois
Results on overall pump head and efficiency performance, pressure pulsation and high speed camera visualization of flow patterns behavior are presented for different inlet air-water void fractions at a given rotational speed. With the increase of inlet v...
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Umair Khan, William Pao and Nabihah Sallih
Gas?liquid two-phase flow is very common in industrial pipelines. Flow regime identification is the first step to design, analyze, and operate the gas?liquid system successfully. The purpose of this study is to develop a methodology for identification of...
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Adham Bekhit and Florin Popescu
In the present study, Computational Fluid Dynamics (CFD) is used to investigate the roll decay of the benchmark surface combatant DTMB-5512 ship model appended with bilge keels, sailing in calm water at different speeds (Fr = 0.0, 0.138, 0.2, 0.28 and 0....
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Sergey V. Isaenkov, Ivan S. Vozhakov, Mikhail V. Cherdantsev, Dmitry G. Arkhipov and Andrey V. Cherdantsev
The complex wave structure of annular gas?liquid flow with disturbance waves and liquid entrainment is a result of the evolution of high-frequency initial waves, appearing at the very inlet of the flow, prior to the hydrodynamic stabilization of liquid f...
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Dengsong Li, Qing Yang, Xudong Ma and Guangqing Dai
The three-dimensional free surface characteristics of flow around two equal diameter cylinders in a side-by-side arrangement were studied numerically. The flow fields were simulated with a three-dimensional finite volume method based on the RNG k-? model...
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Lu Wang, Yiming Li, Zhouping Sun, Sida Meng, Tianlai Li and Xingan Liu
Solar greenhouses are commonly overheated during the day, and the remaining air heat can only be dissipated through ventilation, which is a severe energy waste problem. In order to improve the energy utilization of the greenhouse, this study proposes a w...
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Anna Feichtner, Ed Mackay, Gavin Tabor, Philipp R. Thies and Lars Johanning
Computational fluid dynamics (CFD) modelling of wave interaction with thin perforated structures is of interest in a range of engineering applications. When large-scale effects such as forces and the overall flow behaviour are of interest, a microstructu...
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Shanti Bhushan, Oumnia El Fajri, Graham Hubbard, Bradley Chambers and Christopher Kees
This study evaluates the capability of Navier?Stokes solvers in predicting forward and backward plunging breaking, including assessment of the effect of grid resolution, turbulence model, and VoF, CLSVoF interface models on predictions. For this purpose,...
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Jin Zou, Shijie Lu, Yi Jiang, Hanbing Sun and Zhuangzhuang Li
In the current hydrodynamic research relating to planing hulls, the stern flap and steps are generally considered to be two independent resistance reduction measures. Limited research has focused on the coupled effects of flaps and steps. Therefore, expe...
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