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Xinyu Xu,Yingliang Wang,Xingyu Chen,Xiaolong Zheng,Yongping Zeng 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.4
In order to study the vortex-induced vibration (VIV) characteristics and equivalent static force calculation method of circular steel hangers on the arch bridge, a numerical simulation model of VIV was established using FLUENT software, and the reliability of the model was verified by wind tunnel tests. Effects of wind speed, damping ratio, initial tension and slenderness ratio on the VIV characteristics of circular steel hanger were investigated. Furthermore, the equivalent static force calculation formula and loading range of hanger considering VIV were presented. The results show that with the hanger’s damping ratio decreasing, the maximum amplitude and the lock-in wind speed range increases gradually, while the wind speed and frequency of VIV at the maximum amplitude were not significantly affected. As the initial tension increases or the slenderness ratio decreases, the frequency of VIV increases, and the wind speed corresponding to the maximum amplitude increases, however the maximum vibration amplitude has few changes. Based on a number of numerical analyses on VIV characteristics of hangers, the equivalent static force calculation method is put forward. The equivalent static force calculation method could provide a reference for the design and static analysis of the circular steel hangers.
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The simultaneous photocatalytic degradation of phenol and reduction of Cr(VI) by TiO2/CNTs
Langhuan Huang,Qizhong Chan,Xiaojing Wu,Houjin Wang,Yingliang Liu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
The main objective of this paper is to verify the potential of TiO2/CNTs in the simultaneous photocatalytic degradation of phenol and reduction of Cr(VI). From the present results it can be concluded that there is a synergistic effect between the photocatalytic degradation of phenol and reduction of Cr(VI). Under all tested conditions, the degradation of phenol and reduction of Cr(VI) were examined to follow pseudofirst-order kinetic. The rate constant of 40 mg/L of Cr(VI) was evaluated as 4.34 103 min1 in the absence of phenol, and was increased up to 9.27 103 min1 by adding 10 mg/L of phenol, and to 10.73 103 min1 by adding 15 mg/L of phenol. The presence of Cr(VI) also accelerated the degradation process of phenol, with a factor of 1.84–3 times. Such a great synergistic effect was likely to be attributed to two kinds of effects from CNTs: adsorption effect and electron trap effect. The synergistic effect induced by CNTs was also confirmed by the detection of degradation intermediates of phenol.
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