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< Page ,Total 27 >
Reformulation and improvement of a universal subgrid eddy viscosity model based on the multiscale framework EI
期刊论文 | 2022 , 388 | Computer Methods in Applied Mechanics and Engineering
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A universal multiscale Smagorinsky model (UMSM) is established for the large eddy simulation (LES) of wall-bounded turbulent flows by reformulating a universal subgrid eddy viscosity model presented by Gu et al. (Europhysics Letter 94(3):34003,2011). The UMSM is adapted to the LES of wall-bounded turbulent flows by integrating the 'small-all' form of the multiscale Smagorinsky model with the dynamic subgrid characteristic length, controlled by subgrid-scale (SGS) motions. The dynamic subgrid characteristic length is determined by the characteristic wave number, which is calculated from a new energy-weighted-mean method when the SGS turbulent kinetic energy and the dissipation wave number are known. The dissipation wave number is derived from the SGS turbulent kinetic energy spectrum equation and the total dissipation rate spectrum equation. The UMSM is used to simulate the fully developed channel flow and the turbulent flow past a square cylinder. The dynamic subgrid characteristic length, as a counterpart of Germano's procedure, evaluates the rapidly fluctuating small-scale behavior and spatial variations of turbulent characteristics. The results for fully developed channel flow show that the errors in the streamwise velocity and the velocity fluctuations change slowly. The flat nature of the UMSM error across different multiscale Smagorinsky coefficients (Cs’) indicates that the model is relatively insensitive to the value of Cs′. Additionally, the UMSM is less sensitive to grid resolution since more details of turbulence fluctuations are captured on the same grid-points compared to the RVBMM (Journal of Computational Physics, 234:79-107,2013) and DSM (Journal of Fluid Mechanics 319:353-385,1996). Overall, the proposed model and the DSM exhibit similar behavior, and both LES formulations provide good agreement with reference data from direct numerical simulations. However, the UMSM is more computationally efficient, being 17% faster than the dynamic Smagorinsky model. © 2021 Elsevier B.V.

Keyword :

Large eddy simulation Kinetics Kinetic energy Computational fluid dynamics Cylinders (shapes) Channel flow Turbulent flow Viscosity

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GB/T 7714 Shui, Qingxiang , Wu, Xinyi , Hong, Chao et al. Reformulation and improvement of a universal subgrid eddy viscosity model based on the multiscale framework [J]. | Computer Methods in Applied Mechanics and Engineering , 2022 , 388 .
MLA Shui, Qingxiang et al. "Reformulation and improvement of a universal subgrid eddy viscosity model based on the multiscale framework" . | Computer Methods in Applied Mechanics and Engineering 388 (2022) .
APA Shui, Qingxiang , Wu, Xinyi , Hong, Chao , Zhang, Yunwei , Wong, Nyuk Hien , Yu, Chuck Wah et al. Reformulation and improvement of a universal subgrid eddy viscosity model based on the multiscale framework . | Computer Methods in Applied Mechanics and Engineering , 2022 , 388 .
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Geochemical Properties and Pore Structure Control on Oil Extraction of Shale EI SCIE
期刊论文 | 2021 , 2021 | Lithosphere
WoS CC Cited Count: 1
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Despite geochemical properties and pore structures for shale oil extraction, the interplay among shale chemistry, pore network, and hydrocarbon movability still is an open question. Here, by using hybrid experimental methods, including backscatter scanning electron microscopy, X-ray diffraction, adsorption/desorption isotherm, and nuclear magnetic resonance, we provide a general characteristic of geochemistry and pore structures of Chang 7 (C7) shale in Ordos basin and figure out how these properties impact the shale oil extraction. Our results confirmed that the C7 shale in Ordos basin could be divided into three types based on the mineral components with various pore structures, and the proportion of the pores that radius below 4.8 nm (from adsorption branch) or 3.8 nm (from desorption branch) play a dominant role in the determination of pore size distributions. The kerogen index that is derived from maceral types was the most significant geochemical indicator; high kerogen index was corresponding to large pore volumes and surface areas, but low pore diameters. We identify the pore structure mechanism—mesopores predominantly or micropores abundantly (increase free fluid index) and absence of inorganic or organic pores (decrease free fluid index)—responsible for the oil extraction capability and show that the unmovable fluid stained in the voids would lead to the slow rate decay of the curves, which caused the nonsignal disturbance. Our results demonstrate the powerful control of maceral components and pore diameters on shale oil extraction and show the markedly different flow behavior of various types of shale. © 2021 Dengke Liu et al. All Rights Reserved.

Keyword :

Pore structure Pore size Metamorphic rocks Oil shale processing Decay (organic) Coal Scanning electron microscopy Kerogen Extraction Geochemistry Oil shale retorting

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GB/T 7714 Liu, Dengke , Su, Junwei , Gu, Zhaolin et al. Geochemical Properties and Pore Structure Control on Oil Extraction of Shale [J]. | Lithosphere , 2021 , 2021 .
MLA Liu, Dengke et al. "Geochemical Properties and Pore Structure Control on Oil Extraction of Shale" . | Lithosphere 2021 (2021) .
APA Liu, Dengke , Su, Junwei , Gu, Zhaolin , Qi, Yiru , Yang, Fu , Tian, Tao et al. Geochemical Properties and Pore Structure Control on Oil Extraction of Shale . | Lithosphere , 2021 , 2021 .
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New insights into numerical simulations of flow around two tandem square cylinders EI SCIE
期刊论文 | 2021 , 11 (4) | AIP ADVANCES
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Flows around tandem square cylinders at Re = 100 are numerically studied using a characteristic-based penalty operator splitting finite element method based on a multistep algorithm. The validation of the code and numerical method is performed for flows around single square cylinders. L/D effects (with L being the center-to-center distance and D being the square cylinder width) on the flow structures and parameters are investigated for 1.5 <= L/D <= 9.0. The flow structures, especially far downstream of the square cylinder, indicate six distinct flow regimes. The two-layered vortex formation (TVF) and secondary vortices formation (SVF) modes are defined, and their mechanisms are analyzed. The evolution of TVF into SVF proceeds through the combination of single and binary vortex formations. Variations in the physical flow parameters, including the coefficients of fluctuating lift (C-L '), time-averaged drag ((C) over bar (D))(,) and amplitude lift (C-L(A)) as well as the Strouhal number and phase lag (()phi)(,) are analyzed for various L/D values.(.)Obvious jumps in the flow parameters occur at both square cylinders for L/D = 4.4-4.5 because of vortex impingement. Finally, insight into the physics underlying the relationship between CL-upA, CL-up ', and phi is derived from the simulation results. The local maximum and minimum of CL-upA and CL-up ' occur at phi = 2 pi and 3 pi, respectively, corresponding to in-phase and anti-phase vortex shedding by the cylinders. The pressures on the upper and lower sides of the upstream square cylinder decrease and increase, respectively, leading to reductions in C-L-up(A) and CL-up ' as the flow pattern changes from in-phase to anti-phase.

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GB/T 7714 Shui, Qingxiang , Duan, Cuie , Wang, Daguo et al. New insights into numerical simulations of flow around two tandem square cylinders [J]. | AIP ADVANCES , 2021 , 11 (4) .
MLA Shui, Qingxiang et al. "New insights into numerical simulations of flow around two tandem square cylinders" . | AIP ADVANCES 11 . 4 (2021) .
APA Shui, Qingxiang , Duan, Cuie , Wang, Daguo , Gu, Zhaolin . New insights into numerical simulations of flow around two tandem square cylinders . | AIP ADVANCES , 2021 , 11 (4) .
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Influence of air inlet/outlet arrangement of displacement ventilation on local environment control for unearthed relics within site museum EI SCIE
期刊论文 | 2021 , 246 | ENERGY AND BUILDINGS
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Displacement ventilation system is a proven way to save energy by controlling the local preservation environment for the unearthed relics in site museums. In this study, the influences of air inlet/outlet arrangement as well as the earthen site temperature on the performance of the local environment control system were investigated. The results demonstrate that, in addition to achieving a significant reduction in energy consumption, the displacement ventilation system can also achieve local environmental control within the preservation area of a large exhibition hall, while establishing an equilibrium of the soil-air environment. Moreover, by reducing the height of the return air inlet and the effective height of the environmental control area, energy savings of 47.7-65.9% can be achieved. Moving the position of the air supply outlet to the bottom of the pit has little effect on overall environmental control, while adjusting the air supply temperature to match that of the soil at the bottom of the relic preservation area can effectively reduce environmental disturbance, achieving uniformity and environmental stability. These research results provide not only an effective solution for local environmental control of the relics in site museums, but also a basis for the functioning of the displacement ventilation system within the site exhibition hall. (c) 2021 Elsevier B.V. All rights reserved.

Keyword :

Relic conservation Soil-air coupling environment Displacement ventilation Large space exhibition hall

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GB/T 7714 Luo, Xilian , Huang, Xingyu , Feng, Zhuangbo et al. Influence of air inlet/outlet arrangement of displacement ventilation on local environment control for unearthed relics within site museum [J]. | ENERGY AND BUILDINGS , 2021 , 246 .
MLA Luo, Xilian et al. "Influence of air inlet/outlet arrangement of displacement ventilation on local environment control for unearthed relics within site museum" . | ENERGY AND BUILDINGS 246 (2021) .
APA Luo, Xilian , Huang, Xingyu , Feng, Zhuangbo , Li, Juan , Gu, Zhaolin . Influence of air inlet/outlet arrangement of displacement ventilation on local environment control for unearthed relics within site museum . | ENERGY AND BUILDINGS , 2021 , 246 .
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YY Pyrolytic Characteristics and Kinetics of Guanzhong Wheat Straw and its Components for High-value Products SCIE
期刊论文 | 2021 , 16 (1) , 1958-1979 | BIORESOURCES
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Wheat straw produced annually in the Shaanxi Guanzhong region is a potential biomass feedstock for the production of transportation fuels and specialized chemicals through combustion, pyrolysis, or gasification. In this work, the pyrolytic characteristics, evolved gas products, and kinetics of Guanzhong wheat straw and its components were first investigated with a thermogravimetry-Fourier infrared spectroscopy (TG-FTIR) system. A comparative kinetic study was conducted using different model-free methods of Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Kissinger, and the Coats-Redfern methods. The main pyrolysis products identified by FTIR include H2O, CH4, CO2, and CO as well as aromatics, acids, ketones, and aldehydes. Kinetic results showed that the pyrolytic apparent activation energy of the straw is approximately 200 kJ/mol obtained via FWO and KAS methods at the conversion range of 0.4 to 0.75, which was 30 kJ/mol higher than the value 171.1 kJ/mol obtained by the Kissinger method. The apparent activation energy of cellulose in its main pyrolysis region is 135.5 kJ/mol and is about three times larger than that of hemicellulose (49.5 kJ/mol). The apparent activation energy of lignin at the temperature range of 45 to 116 degrees C was 34.5 kJ/mol, while that value at the temperature range of 120 to 252 degrees C was 6.64 kJ/mol.

Keyword :

Apparent activation energy Kinetics TG-FTIR Guanzhong wheat straw Pyrolysis

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GB/T 7714 Hu, Bingtao , Gu, Zhaolin , Su, Junwei et al. YY Pyrolytic Characteristics and Kinetics of Guanzhong Wheat Straw and its Components for High-value Products [J]. | BIORESOURCES , 2021 , 16 (1) : 1958-1979 .
MLA Hu, Bingtao et al. "YY Pyrolytic Characteristics and Kinetics of Guanzhong Wheat Straw and its Components for High-value Products" . | BIORESOURCES 16 . 1 (2021) : 1958-1979 .
APA Hu, Bingtao , Gu, Zhaolin , Su, Junwei , Li, Zhijian . YY Pyrolytic Characteristics and Kinetics of Guanzhong Wheat Straw and its Components for High-value Products . | BIORESOURCES , 2021 , 16 (1) , 1958-1979 .
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The practice of local environment control for the funerary pits of Emperor Qin's Mausoleum Site Museum SCIE
期刊论文 | 2021 , 30 (3) , 293-297 | INDOOR AND BUILT ENVIRONMENT
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GB/T 7714 Luo, Xilian , Dang, Yuexi , Yu, Chuck Wah et al. The practice of local environment control for the funerary pits of Emperor Qin's Mausoleum Site Museum [J]. | INDOOR AND BUILT ENVIRONMENT , 2021 , 30 (3) : 293-297 .
MLA Luo, Xilian et al. "The practice of local environment control for the funerary pits of Emperor Qin's Mausoleum Site Museum" . | INDOOR AND BUILT ENVIRONMENT 30 . 3 (2021) : 293-297 .
APA Luo, Xilian , Dang, Yuexi , Yu, Chuck Wah , Gu, Zhaolin . The practice of local environment control for the funerary pits of Emperor Qin's Mausoleum Site Museum . | INDOOR AND BUILT ENVIRONMENT , 2021 , 30 (3) , 293-297 .
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Experimentation of a Membrane-based Concentration Gradient Energy Storage of Liquid Desiccant Solutions Driven by Solar Energy SCIE CSCD
期刊论文 | 2021 , 30 (5) , 1503-1512 | JOURNAL OF THERMAL SCIENCE
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Solar energy storage is an indispensable and sustainable utilization mode of renewable energy; environment friendly, large-capacity, low heat loss, and long-term storage are critical to improving the integration of solar energy supply. Traditional thermal energy storage mode cannot achieve long-term storage due to the heat loss even under the excellent thermal insulation measures. In this work, a solar-powered membrane-based concentration gradient energy storage of liquid desiccant solutions is presented. In the membrane distillation process driven by solar energy under the right solar radiation conditions, the liquid desiccant solution is concentrated gradually and long-term stored as the concentration gradient energy. To this end, the measured temperature of solar hot water is in the range of 40 degrees C to 90 degrees C from May to September, 2018, in Xi'an, China. And then, the LiBr solution (50 wt%), the LiCl solution (35 wt%), and the CaCl2 solution (40 wt%) were membrane-based concentrated in the temperature range of 42 degrees C to 63 degrees C, separately. The results showed that the water vapor pressure difference decides the water vapor transferred across the membrane pores from the liquid desiccant side to the air side. The energy storage density of liquid desiccant solutions increases along with the increases in temperature and the membrane area. Consequently, when the LiBr, LiCl, and CaCl2 solutions are concentrated from 50% to 55%, from 35% to 40%, and from 40% to 45%, separately, the concentration energy storage density is 245 kJ/kg, 350 kJ/kg, and 306 kJ/kg, which is equivalent to or even higher than ice storage capacity. Due to the two independent closed cycle of the liquid desiccant solution and air, the liquid desiccant solution's concentration gradient energy storage can be long-term stored environment-friendly without any insulation measures.

Keyword :

liquid desiccant energy storage concentration gradient energy membrane concentration solar energy

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GB/T 7714 Wang, Zanshe , Li, Ran , Yin, Fangting et al. Experimentation of a Membrane-based Concentration Gradient Energy Storage of Liquid Desiccant Solutions Driven by Solar Energy [J]. | JOURNAL OF THERMAL SCIENCE , 2021 , 30 (5) : 1503-1512 .
MLA Wang, Zanshe et al. "Experimentation of a Membrane-based Concentration Gradient Energy Storage of Liquid Desiccant Solutions Driven by Solar Energy" . | JOURNAL OF THERMAL SCIENCE 30 . 5 (2021) : 1503-1512 .
APA Wang, Zanshe , Li, Ran , Yin, Fangting , Wu, Yue , Gu, Zhaolin . Experimentation of a Membrane-based Concentration Gradient Energy Storage of Liquid Desiccant Solutions Driven by Solar Energy . | JOURNAL OF THERMAL SCIENCE , 2021 , 30 (5) , 1503-1512 .
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基于入户调查的贵阳市生活燃煤排放清单 CSCD
期刊论文 | 2021 , 41 (5) , 1809-1817 | 环境科学学报
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为准确掌握贵阳市生活燃煤大气污染物的排放状况,为南方山地城市大气污染防治工作提供科学依据,本研究于2017年对贵阳市生活燃煤情况开展了入户调查.据统计分析,2016-2018年贵阳市常住人口和生活煤炭消费量变化小.同时,采用排放系数法结合GIS技术,建立了贵阳市2016年1 km×1 km生活燃煤大气污染物排放清单.结果表明:①全市生活燃煤量约为55.9×104t,单位面积燃煤量为69.5 t·km-2,不同区(市、县)生活燃煤量存在明显差异;从燃煤总量来看,开阳县最大,云岩区最小;从单位面积燃煤量来看,云岩区最大,息烽县最小.②全市生活燃煤PM10、PM2.5、SO2、NOx、VOCs、CO、OC、BC排放量分别为1230.5、783.0、6963.5、615.3、1006.8、39096.4、55.9、3.9t,单位面积排放量分别为153.0、97.4、865.7、76.5、125.2、4860.7、7.0、0.5 kg·km-2.③生活燃煤污染物排放量呈明显的季节性变化特征,冬季采暖季污染物的排放量远高于非采暖季.④在空间分布上,大气污染物排放主要集中在云岩区、南明区、白云区中南部,以及观山湖区东南部、乌当区西南部及花溪区东北部,这与居民生活区域基本呈一致性分布.⑤调查样本量覆盖了总家庭户数的1.5%,全市以煤炭为生活能源的住户占比约为38.1%,户均燃煤量为(1.158±0.010) t·a-1,排放清单不确定性总体范围为-82.6%~201.0%.

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GB/T 7714 王艳妮 , 秦俊虎 , 杨敬婷 et al. 基于入户调查的贵阳市生活燃煤排放清单 [J]. | 环境科学学报 , 2021 , 41 (5) : 1809-1817 .
MLA 王艳妮 et al. "基于入户调查的贵阳市生活燃煤排放清单" . | 环境科学学报 41 . 5 (2021) : 1809-1817 .
APA 王艳妮 , 秦俊虎 , 杨敬婷 , 郑明杰 , 徐玮 , 黄贤峰 et al. 基于入户调查的贵阳市生活燃煤排放清单 . | 环境科学学报 , 2021 , 41 (5) , 1809-1817 .
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实验年限对砒砂岩改良风沙土微观结构的影响 CSCD
期刊论文 | 2021 , 55 (12) , 172-179 | 西安交通大学学报
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为了厘清植物种植过程对砒砂岩改良风沙土的微观结构的影响,利用扫描电子显微镜(SEM)扫描土壤团聚体并结合Sierpinski分形模型,借助砒砂岩改良土场地实验,定量研究了0年(对照组)、3年、6年、9年4个实验年限下的砒砂岩改良风沙土的微观结构特征及演变过程.结果表明:随着作物种植年限的增加,在种植第6年和第9年后的土壤微团聚体出现了较多数量的桥接状垒结、填集状垒结、包膜状垒结,粒径小于50μm颗粒显著增加,颗粒方向及颗粒形状从简单向复杂转变;改良土颗粒的Sierpinski分维值在种植9年后达到1.2048,相比于种植3年土壤增加了9.88%,表明在种植作用下土壤结构得到显著的改良.

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GB/T 7714 罗昔联 , 汪怡珂 , 韩霁昌 et al. 实验年限对砒砂岩改良风沙土微观结构的影响 [J]. | 西安交通大学学报 , 2021 , 55 (12) : 172-179 .
MLA 罗昔联 et al. "实验年限对砒砂岩改良风沙土微观结构的影响" . | 西安交通大学学报 55 . 12 (2021) : 172-179 .
APA 罗昔联 , 汪怡珂 , 韩霁昌 , 顾兆林 . 实验年限对砒砂岩改良风沙土微观结构的影响 . | 西安交通大学学报 , 2021 , 55 (12) , 172-179 .
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南北向街谷内热不稳定流场日变化规律的模拟研究 CSCD
期刊论文 | 2021 , 12 (3) , 322-332 | 地球环境学报
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城市街谷内热不稳定流动是促进污染物扩散的重要影响因素之一.本文基于街谷内热平衡分析,结合大涡模拟方法,研究了一个南北走向的城市街谷内温度、风场的日变化特征,并分析了壁面对流换热及长波辐射对街谷内环境的影响.结果显示:壁面对流换热是影响街谷内温度、风场的主要因素,而长波辐射的影响非常小,长波辐射引起街谷内空气温度升高不足对流换热影响的10%,而其对平均风速和脉动量的影响更是在2%和1%以内;街谷内空气温度从早上开始逐渐增加,到15:00的时候达到最大,可达311 K(38℃);上午时段,迎风面壁面热浮力减弱街谷内风速,街谷底部和迎风墙侧的脉动量根均方值较大,而下午时段街谷顶部的脉动量根均方值达到最大.街谷内不同位置和不同时段内,通过建筑材料选择和表面结构设计,适当调控建筑壁面的温度,可以促进街谷内温度分布和空气流通改善.

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GB/T 7714 张云伟 , 许雯 , 王晴茹 et al. 南北向街谷内热不稳定流场日变化规律的模拟研究 [J]. | 地球环境学报 , 2021 , 12 (3) : 322-332 .
MLA 张云伟 et al. "南北向街谷内热不稳定流场日变化规律的模拟研究" . | 地球环境学报 12 . 3 (2021) : 322-332 .
APA 张云伟 , 许雯 , 王晴茹 , 苏军伟 , 黄宇 , 顾兆林 . 南北向街谷内热不稳定流场日变化规律的模拟研究 . | 地球环境学报 , 2021 , 12 (3) , 322-332 .
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