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- 저자 : Guowei Qian (검색결과 4 건)
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Ke Li,Guowei Qian,Yaojun Ge,Lin Zhao,Jin Di 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.28 No.2
Vortex-Induced-Vibration (VIV) is one kind of the wind-induced vibrations, which may occur in the construction and operation period of bridges. This phenomenon can bring negative effects to the traffic safety or can cause bridge fatigue damage and should be eliminated or controlled within safe amplitudes. In the current VIV studies, one available mitigation countermeasure, the horizontal flow-isolating plate, shows satisfactory performance particularly in PI shaped bridge deck type. Details of the wind tunnel test are firstly presented to give an overall description of this appendage and its control effect. Then, the computational-fluid-dynamics (CFD) method is introduced to investigate the control mechanism, using two-dimensional Large-Eddy-Simulation to reproduce the VIV process. The Reynolds number of the cases involved in this paper ranges from 1×〖10〗^5 to 3×〖10〗^5, using the width of bridge deck as reference length. A field-filter technique and detailed analysis on wall pressure are used to give an intuitive demonstration of the changes brought by the horizontal flow-isolating plate. Results show that this aerodynamic appendage is equally effective in suppressing vertical and torsional VIV, indicating inspiring application prospect in similar PI shaped bridge decks.
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Rapid Microwave Irradiation Synthesis and Photoelectrochemical Performance of Cu3BiS3 nanoparticles
Wei Wang,Guowei Zhi,Liu Liu,Yujie Fei,QinYang Sheng,Yushi Shi,Hanyu Yao,Hongqiang Qian 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.6
A photocatalytic material with high performance and low cost plays a decisive role in the industrialization of photocatalytichydrogen evolution. In this work, Cu3BiS3 nanoparticles were successfully synthesized by the microwave irradiationmethod, and the formation mechanism of Cu3BiS3 was studied. The Cu3BiS3 was a nanorod structure with 122 nm diameterand 41 nm length. The band gap was 1.31 eV and the EVB was located at 0.15 eV from the Mott-Schottky analysis. The Cu3BiS3 electrode exhibited an excellent HER performance with an onset potential of 870 mV, a Tafel slope of 251.07mV/dec. And the charge transfer resistance (Rct) of Cu3BiS3 electrode was 7.2 Ω. The electrode also revealed the goodphotoelectric response ability. The electrode also revealed the good photoelectric response ability and good stability bytime course of the photocurrents. This work provided a fast, low-cost method to prepare the Cu3BiS3 for photocatalysiswater splitting.
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Removal characteristics of Cd(II) ions from aqueous solution on ordered mesoporous carbon
Linhang Lu,Haibo Zhao,Lu Yan,Guowei Wang,Yulin Mao,Xin Wang,Kai Liu,Xiufang Liu,Qian Zhao,Tingshun Jiang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
Ordered mesoporous carbon (CMK-3) was synthesized using SBA-15 mesoporous molecular sieve as a template and sucrose as carbon source. The materials were characterized by XRD, TEM and N2 physical adsorption technique. The resulting CMK-3 was used as adsorbent to remove Cd(II) ions from aqueous solution. The effect of pH, contact time and temperature on adsorption process was investigated in batch experiments. The results showed that the removal percentage could reach ca. 90% at the conditions of initial Cd(II) ions concentration of 20 mg/L, dose of 20mg, pH 6.5, contact time of 3h and 293K. Langmuir and Freundlich models were employed to describe the adsorption equilibrium. The kinetics data were described by the pseudo-first-order and pseudo-second-order models, respectively. The adsorption isotherm was well fitted to the Langmuir model, and the adsorption process was well described by the pseudo-second-order kinetic model.
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Hongtao Shen,Weicheng Hu,Qing-shan Yang,Fucheng Yang,Kunpeng Guo,Tong Zhou,Guowei Qian,Qinggen Xu,Ziting Yuan 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.35 No.6
In wind-resistant designs, wind velocity is assumed to be a Gaussian process; however, local complex topography may result in strong non-Gaussian wind features. This study investigates the non-Gaussian wind features over complex terrain under atmospheric turbulent boundary layers by the large eddy simulation (LES) model, and the turbulent inlet of LES is generated by the consistent discretizing random flow generation (CDRFG) method. The performance of LES is validated by two different complex terrains in Changsha and Mianyang, China, and the results are compared with wind tunnel tests and onsite measurements, respectively. Furthermore, the non-Gaussian parameters, such as skewness, kurtosis, probability curves, and gust factors, are analyzed in-depth. The results show that the LES method is in good agreement with both mean and turbulent wind fields from wind tunnel tests and onsite measurements. Wind fields in complex terrain mostly exhibit a left-skewed Gaussian process, and it changes from a softening Gaussian process to a hardening Gaussian process as the height increases. A reduction in the gust factors of about 2.0%-15.0% can be found by taking into account the non-Gaussian features, except for a 4.4% increase near the ground in steep terrain. This study can provide a reference for the assessment of extreme wind loads on structures in complex terrain.
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