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| 1 | Dynamic behaviors of cavitation bubble for the steady cavitating flow显示文摘In this paper, by introducing the flow velocity item into the classical Rayleigh-Plesset dynamic equation, a newequation, which does not involve the time term and can describe the motion of cavitation bubble in the steadycavitating flow, has been obtained. By solving the new motion equation using Runge-Kutta fourth order methodwith adaptive step size control, the dynamic behaviors of cavitation bubble driven by the varying pressure fielddownstream of a venturi cavitation reactor are numerically simulated. The effects of liquid temperature (correspondingto the saturated vapor pressure of liquid), cavitation number and inlet pressure of venturi on radial motionof bubble and pressure pulse due to the radial motion are analyzed and discussed in detail. Some dynamicbehaviors of bubble different from those in previous papers are displayed. In addition, the internal relationshipbetween bubble dynamics and process intensification is also discussed. The simulation results reported in thiswork reveal the variation laws of cavitation intensity with the flow conditions of liquid, and will lay a foundationfor the practical application of hydrodynamic cavitation technology. | Jun CAI,Xiulan HUAI and Xunfeng LIInstitute of Engineering Thermophysics,Chinese Academy of Sciences,P.O.Box 2706,Beijing 100190,China Professor | 2009 | Journal of Thermal Science2009，18，4： | 9 |
| 2 | 3D CFD modeling of acetone hydrogenation in fixed bed reactor with spherical particles显示文摘Acetone hydrogenation in a fixed bed reactor packed with spherical catalyst particles was simulated to study the effects of inlet gas velocity and particle diameter on hydrogenation reaction.Computational results show that the catalyst particles in the reactor are almost isothermal,and the high isopropanol concentration appears at the lee of the particles.With the increase of inlet velocity,the outlet isopropanol mole fraction decreases,and the total pressure drop increases drastically.Small diameter catalyst particles are favorable for acetone hydrogenation,but result in large pressure drop. | Xiaoming Zhou Yanjun Duan Xiulan Huai Xunfeng Li | 2013 | Particuology2013，11，6： | 7 |
| 3 | Enhanced activation of peroxydisulfate by strontium modified BiFeO3 perovskite for ciprofloxacin degradation显示文摘A series of Sr-doped BiFeO3 perovskites(Bi1-xSrxFeO3,BSFO)fabricated via sol-gel method was applied as peroxydisulfate(PDS)activator for ciprofloxacin(CIP)degradation.Various technologies were used to characterize the morphology and physicochemical features of prepared BSFO samples and the results indicated that Sr was successfully inserted into the perovskites lattice.The catalytic performance of BiFeO3 was significantly boosted by strontium doping.Specifically,Bi0.9Sr0.1FeO3(0.1 BSFO)exhibited the highest catalytic performance for PDS activation to remove CIP,where 95%of CIP(10 mg/L)could be degraded with the addition of 1 g/L 0.1 BSFO and 1 mmol/L PDS within 60 min.Moreover,0.1 BSFO displayed high reusability and stability with lower metal leaching.Weak acidic condition was preferred to neutral and alkaline conditions in 0.1 BSFO/PDS system.The boosted catalytic performance can be interpreted as the lower oxidation state of Fe and the existence of affluent oxygen vacancies generated by Sr doping,that induced the formation of singlet oxygen(^1O_(2))which was confirmed as the dominant reactive species by radical scavenging studies and electron spin resonance(ESR)tests.The catalytic oxidation mechanism related to major ^1O_(2) and minor free radicals was proposed.Current study opens a new avenue to develop effective A-site modified perovskite and expands their application for PDS activation in wastewater remediation. | Caicai Wang Shengwang Gao Jianchao Zhu Xunfeng Xia Mingxin Wang Yanna Xiong | 2021 | Journal of Environmental Sciences2021，33，1： | 4 |
| 4 | STRUCTURE DESIGN OF THE BEIJING SPECTROMETERⅢBEAM PIPE显示文摘The Beijing spectrometerⅢ(BESⅢ)beam pipe is in the center of the BESⅢ,which is the detector of the upgrade project of Beijing electron and positron collider(BEPCⅡ).Electrons and positrons collide in the BESⅢbeam pipe.According to the demands of the BEPCⅡ,a key program of Chinese Academy of Sciences,the BESⅢbeam pipe is designed based on the finite elements analysis.The BESⅢbeam pipe is installed in the inner cylinder of the BESⅢdrift chamber.As a vacuum tube,the BESⅢbeam pipe is designed as 1000 mm in length,63 mm in inner diameter and 114 mm in outer diameter,respectively.The BESⅢbeam pipe consists of a central beryllium pipe cooled by EDM-1,the oil No.1 for electric discharge machining,and two extended copper pipes cooled by deionized water(DW).The three parts are jointed by vacuum welding.Factors taken into account in the design are as follows.①The wall thickness of the central beryllium pipe should be designed as small as possible to reduce the multi-scattering and improve the particle momentum resolution.And the wall thickness of the extended copper pipe should be designed as large as possible to protect the detectors from the backgrounds.②The BESⅢbeam pipe must be sufficiently cooled to avoid the damage and prevents its influence to the BESⅢdrift chamber(DC)operation.The inner surface temperature of the DC inner cylinder must be maintained at 293±2 K.③The magnetic permeability of the materials used in the BESⅢbeam pipe must be less than 1.05 H/m to avoid large magnetic field distortions.④The static pressure of the vacuum chamber of the BESⅢbeam pipe must be less than 800μPa.The simulating results show that the designed structure oftbe BESⅢbeam pipe satisfies the requirements mentioned above.The structure design scheme is evaluated and adopted by the headquarters of BEPCⅡ. | ZHENG Lifang JI Quan WANG Li LI xunfeng XU Shaowang DONG Sujun ZHAO Libin LIU Jianping | 2008 | Chinese Journal of Mechanical Engineering2008，21，3： | 3 |
| 5 | Collection efficiency in a three-dimensional randomly arranged dual-layer granular bed filter显示文摘The dual-layer granular bed filter packed with randomly arranged granules was simulated to study the effects of bed depth of the lower layer of fine granules and the inlet gas velocity on the collection mechanism.The computational results show that the collection efficiency is much better from this granular bed than a single-layer granular bed,especially for particle diameters of 1-10μm.The inlet gas velocity has less effect on the grade collection efficiency of the dual-layer granular bed than of the single-layer granular bed.The dual-layer granular bed provides a high collection efficiency and low pressure drop.The relationship between the grade collection efficiency and the Stokes number(St)based on the inlet gas velocity is obtained.If St is below a threshold,the grade collection efficiency remains stable;if St is in value above threshold,the grade collection efficiency increases linearly with lg(St).As the bed depth of the lower layer of fine granules increases,the threshold for St shifts forward. | Junlin Chen Xunfeng Li Xiulan Huai Jingzhi Zhou | 2020 | Particuology2020，18，2： | 3 |
| 6 | Foraging areas of Rousettus leschenaulti on the Hainan Island of China显示文摘We investigated the foraging area of three individuals (1 female and 2 males) of Rousettus leschenaulti (Chiroptera,Pteropodidae) in suburban Haikou City, Hainan Province, South China from November 2005 to January 2006 using radio telemetry.These animals left the daytime roosting sites about 90 min after sunset with no significant difference in departure time betweenthe male and female bats. The average active times were 391.8 min for males and 533.7 min for the female, respectively.By reconstructing 93 radio-telemetry recording positions, we found that the long axis of foraging area of the bats ranged from7.45 to 11.70 km. The foraging area of the female (3867 ha) was larger than that of the males (1138 ha), and there was overlapbetween the foraging areas of different individuals. These bats usually kept the same flight routes across a few successive daysfrom the daytime roosting site to the foraging areas. Our findings suggested that female R. leschenaulti may explore a larger foragingarea than males. No obvious territorial behaviors were observed in our studied area. | Zhanhui TANG Zhong CHEN Jie MA Guangjian ZHU Xunfeng MA Lianxi SHENG Yuchun LI | 2010 | Current Zoology2010，56，4： | 2 |
| 7 | Effect of cavitating flow on forced convective heat transfer: a modeling study显示文摘With water as working medium,a numerical study on liquid convection heat transfer accompanied by cavitating flow in a circular tube was conducted by combining mixture model and Schnerr–Sauer cavitation mode in the commercial code,Ansys Fluent.Cavitation is instigated by setting a restriction orifice in the circular tube.The simulation results show that cavitation occurs around the wall of the restriction orifice and disappears at the downstream regions.The comparison of local heat transfer coefficients under the same mass flow rate indicates that,heat transfer is significantly augmented at the downstream regions of the restriction orifice because of the occurrence of cavitation.The analysis on the characteristics of cavitating and noncavitating flows confirms that the occurrence of cavitation can increase the turbulence intensity under the same mass flow rate,which is the origin for heat transfer to be enhanced.Based on it,the effects of such factors as inlet pressure and ratio of orifice to pipe diameter on cavitation enhanced heat transfer were further investigated for the purpose of application. | Jun Cai Xunfeng Li Bin Liu Xiulan Huai | 2014 | Chinese Science Bulletin2014，59，14： | 2 |
| 8 | Numerical study of collection efficiency and heat-transfer characteristics of packed granular filter显示文摘The collection mechanism and heat-transfer characteristics of a packed granular filter were investigated using a three-dimensional randomly packed granular filter model. The bridging method was introduced to optimize the grids of contact points between granules. The influences of granular bed depth, gas velocity, and gas temperature on grade collection efficiency were investigated. The results indicated that a decrease of temperature improved collection efficiency when the particle diameter was greater than 5 |xm. The grade collection efficiency maintained a stable value when the Stokes number, St, was less than 0.009, but increased linearly with ig(St) when St > 0.009. A logarithmic mean temperature difference method was used to obtain overall heat-transfer coefficients of gas-solid two-phase flow through the packed granular filter. The results showed that convective heat transfer was enhanced due to the intro-duction of solid particles in the bed. The overall heat-transfer coefficient increased approximately linearly with an increase in particle loading ratio. The Nusselt number was related to the Reynolds number, the Archimedes number, and the particle loading ratio. | Junlin Chen Xunfeng Li Xiulan Huai Yongwei Wang Jingzhi Zhou | 2019 | Particuology2019，17，5： | 2 |
| 9 | Review of challenges and strategies for balanced urban-rural environmental protection in China显示文摘与在中国的环境保护论的上升,大努力在过去的几十年被奉献给环境保护。与城市的环境保护相比,农村环境保护没被依附在中国的足够的重要性由于社会经济的开发的双轨道的结构。作为结果,因为在环境政策,环境权利和兴趣看见的城市、农村的环境保护之间的差别和偏爱,农村中国部分正在承担不相称地重的环境负担,环境保护投资,和人的环境保护了解。消除在农村、城市的环境保护之间的差距,并且达到平衡城市农村的环境保护(BUREP ) 的目标,管理应该考虑畴划合适的政策和策略。在这份报纸,我们对瓷器城市农村的环境保护的背景提出了 BUREP 的创新策略。首先,我们在中国与城市的环境保护相比考察农村环境保护地位和它的挑战的当前的地位。第二,我们深深地分析了主要开车因素和原因,然后我们在在城市、农村的环境之间的不相等的地位上提出了 BUREP 策略底。最后,我们建议了 BUREP 的框架。这研究可以在协调城市、农村的环境保护并且在构造中国的新农村关于决策用作一本科学参考书。 | Beidou XI Xiaoguang LI Jixi GAO Ying ZHAO Hongliang LIU Xunfeng XIA Tianxue YANG Lieyu ZHANG Xuan JIA | 2015 | Frontiers of Environmental Science & Engineering2015，9，3： | 2 |
| 10 | Study of turbulent heat transfer of aviation kerosene flows in a curved pipe at supercritical pressure显示文摘 | Xunfeng Li Fengquan Zhong Xuejun Fan Xiulan Huai Jun Cai | 2010 | Applied Thermal Engineering2010，，13： | 2 |
| 11 | Convective heat transfer characteristics of China RP-3 aviation kerosene at supercritical pressure显示文摘 | Xunfeng Li Xiulan Huai Jun Cai Fengquan Zhong Xuejun Fan Zhixiong Guo | 2011 | Applied Thermal Engineering2011，，14： | 2 |
| 12 | Development of AFEX-based consolidated bioprocessing on wheat straw for biohydrogen production using anaerobic microflora 显示文摘 | CAO Guangli XIA Xunfeng ZHAO Lei | 2013 | Int J Hydrogen Energy2013，38，15： | 1 |
| 13 | An evaluation of an online bilingual corpus for the self-learning of legal English显示文摘 | May Fan Xu Xunfeng | 2002 | Sys- tem 30 (2002) 47 - 632002，30，： | 1 |
| 14 | The ammoniumnitrogen oxidation process in horizontal subsurface flow constructedwetlands显示文摘 | ZHANG Lieyu XIA Xunfeng ZHAO Ying | 2011 | Ecological Engineering2011，37，11： | 1 |
| 15 | High Order Energy-Preserving Method of the “Good” Boussinesq Equation显示文摘The fourth order average vector field(AVF)method is applied to solve the“Good”Boussinesq equation.The semi-discrete system of the“good”Boussi-nesq equation obtained by the pseudo-spectral method in spatial variable,which is a classical finite dimensional Hamiltonian system,is discretizated by the fourth order average vector field method.Thus,a new high order energy conservation scheme of the“good”Boussinesq equation is obtained.Numerical experiments confirm that the new high order scheme can preserve the discrete energy of the“good”Boussinesq equation exactly and simulate evolution of different solitary waves well. | Chaolong Jiang Jianqiang Sun Xunfeng He Lanlan Zhou | 2016 | Numerical Mathematics(Theory,Methods and Applications)2016，9，1： | 1 |
| 16 | Discrimination of varieties of tea using near infrared spectroscopy by principal component analysis and BP model显示文摘 | HE Yong LI Xiaoli DENG Xunfeng | 2007 | Journal of Food Engineering2007，79，4： | 1 |
| 17 | QSAR for the acute toxicity of nitroaromatics to the carp显示文摘 | Lang Peizhen Ma Xunfeng Lu Guanghua | 1996 | Chemosphere1996，32，8： | 1 |
| 18 | Performance analysis of Isopropanol-Acetone-Hydrogen chemical heat pump显示文摘 | GUO Jiangfeng HUAI Xiulan LI Xunfeng | 2012 | Applied Energy2012，93，： | 1 |
| 19 | Determination of marbofloxacin residues in beef and pork with an enzyme-linked immunosorbent assay显示文摘 | SHENG Wei XIA Xunfeng WEI Keyi | 2009 | J Agric Food Chem2009，5703，： | 1 |
| 20 | QSAR for the acute toxicity of nitroaromatics to the Carp显示文摘 | Lang Peizhen Ma Xunfeng Lu Guanghua | 1996 | Chemosphere1996，32，8： | 1 |
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