检索结果-内蒙古大学图书馆

Energy and exergy analyses of a novel recirculated regenerative rotary desiccant wheelassisted dehumidification system 33

Energy and exergy analyses of a novel recirculated regenerat...

引用

33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2020

作者： Han, Xiaoqu Wu, Wenxiang Chong, Daotong Su, Minqi Zhang, Dan Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an China MOE Key Laboratory of Thermal Fluid Science and Engineering Xi'An Jiaotong University Xi'an China

The indoor air humidity and temperature in the marine cabins could be as high as 80% and 40 °C - 50 °C, respectively, which may cause security risks to crews and devices. The incorporation of solid desiccant wheel for improved dehumidification and air quality control would contribute to energy saving in air conditioning system through waste heat recovery for regeneration. In the present work, a novel recirculated regenerative rotary desiccant wheel-assisted dehumidification system was proposed. The energy and exergy performances of the system under variable working conditions were quantitatively studied based on experimental tests. The dehumidification effectiveness, dehumidification performance coefficient (DCOP), sensible energy ratio and coefficient of performance (COP) were introduced as key energetic indicators. The effects of air bypass ratio (50% - 85%), process air temperature (28 °C - 40 °C), relative humidity of process air (60%RH - 80%RH) and regeneration air temperature (130 °C - 150 °C) on the system performances were obtained. It was found the COP of the system ranged between 0.4 and 1.8, while the exergy efficiency was only 4% - 11%. An optimal bypass ratio existed which was determined 55%-60%. Overall, the energy saving and exergy consumption characteristics of the proposed system at various working conditions were explored to prompt its practical application. © ECOS *** right reserved.

关键词： Waste heat

来源：评论

学校读者我要写书评

暂无评论

Experimental Study on flow Patterns in Narrow Rectangular Channels

SSRN

引用

SSRN 2022年

作者： Lv, Xindi Zhang, Dalin Song, Gongle Su, Guanghui Tian, Wenxi Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

Plate fuel elements are commonly used in compact nuclear reactors due to the advantages of high fuel consumption. In this paper, the two-phase flow pattern in the coolant channel of plate fuel elements, i.e. the rectangular narrow channel was studied. Visualization flow pattern experiments of upward steam-water two-phase flow in narrow rectangular channels, 745mm long and 67mm wide with gap widths of 1.3mm and 1.9mm, were investigated. The experiments were performed in the conditions of pressure ranging from 1 to 2MPa, mass flow rate ranging from 200 to 1500kg/(m2 ⋅s), inlet subcooling ranging from 20~100°C and tilt angle ranging from 0~ 45°. Three flow patterns, consisting of bubble flow, churn flow and annular flow, were obtained in a wide range of thermal parameters. flow patterns maps were plotted and the influences of pressure, mass flow rate, inlet subcooling, channel gap and tilt angle on the flow pattern transformation of narrow rectangular channel were studied. This study is of great significance for investigating the subsequent heat transfer process of two-phase flow in compact nuclear reactors. © 2022, The Authors. All rights reserved.

关键词： Two phase flow

来源：评论

学校读者我要写书评

暂无评论

Thermionic Conversion Performance Analysis of the Single-Cell Thermionic Fuel Element Based on Froba-Thermion Code

SSRN

引用

SSRN 2022年

作者： Lu, Kailin Yao, Hao He, Yanan Wu, Yingwei Zhang, Jing Liao, Haoyu Su, Guanghui H. Qiu, Suizheng School of Nuclear Science and Technology Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

The thermionic conversion performance of the single-cell thermionic fuel element (TFE) is influenced by fuel mass transfer and other parameters. With the consideration of current flow and heat transfer, the thermionic conversion model and the modified heat transfer model were implemented in FROBA-THERMION. Afterward, both implemented models were verified by comparing with experiments or KATET calculation results. Further, a steady-state performance simulation of the single-cell TFE was carried out. The results indicate that the thermionic conversion efficiency will be decreased due to the emitter temperature flattening caused by fuel mass transfer. In addition, the influence of several key parameters on thermionic conversion efficiency and measures to improve the thermionic conversion efficiency were analyzed. © 2022, The Authors. All rights reserved.

关键词： Mass transfer

来源：评论

学校读者我要写书评

暂无评论

Fe-saturated polyaniline adsorbent repurposed for carboxylic acid drugs removal: A sustainable strategy from ferric waste to water remediation

引用

Separation and Purification Technology 2025年 371卷

作者： Shi, Bofang Fu, Xiaojie Li, Hang Jamshed, Muhammad Yu, Qi Li, Mingtao Yang, Honghui Xi'an Key Laboratory of Sustainable Energy Materials Chemistry Department of Applied Chemistry School of Chemistry Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China China Coal Energy Research Institute Co. Ltd Xi'an 710201 China Xi'an Taijin New Energy Technology Co. Ltd Xi'an 710201 China

The removal of non-steroidal anti-inflammatory drugs (NSAIDs) via adsorption necessitates the development of advanced adsorbents that harmonize efficiency with cost-effectiveness. Herein, a circular and economic approach is proposed by repurposing Fe-saturated polyaniline (Fe-PANI) waste into a high-performance adsorbent for carboxylic acid drug removal. The Fe-PANI exhibited high equilibrium adsorption capacities of 196.8 mg/g (diclofenac, DCF), 75.2 mg/g (naproxen, NPX), and 40.5 mg/g (ibuprofen, IBP) under neutral conditions (pH 6.0), outperforming the performance of pristine PANI material. Adsorption experiments revealed pseudo-second-order kinetics and Langmuir monolayer adsorption behavior. The pH values and the presence of carbonate species (CO32– and HCO3–) were identified as critical factors affecting adsorption process. Experimental evidence and density functional theory (DFT) calculations confirmed that the incorporation of Fe2+/Fe3+ into PANI significantly altered its electronic structure, facilitating synergistic adsorption via Fe-carboxylate coordination, π-π stacking, and proton-enhanced electrostatic interactions. The used adsorbent was successfully regenerated via a Fe-mediated heterogeneous Fenton reaction (0.025 mol/L H2O2, pH 6.0), retaining 82% of its adsorption capacity after three cycles. This dual-functional strategy effectively utilizes hazardous metal-loading waste and addresses drug pollution through adsorption and oxidative regeneration, providing a sustainable approach for water remediation technologies. © 2025 Elsevier B.V.

关键词： Carboxylation

来源：评论

学校读者我要写书评

暂无评论

An Experimental Study on the Hypergolic Process Enhanced by Pre-Ignition Heat Release: [Amim][Dca]/Furfuryl Alcohol Blends Reacting with White Fuming Nitric Acid

SSRN

引用

SSRN 2022年

作者： Wu, Yingtao Wang, Zhi Fei, Lihan Guo, Yang Liu, Yang Tang, Chenglong Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Research Center of Energetic Material Genome Science Institute of Chemical Materials China Academy of Engineering Physics Mianyang China

The hypergolic ignition behaviors of [AMIM][DCA] (1-allyl-3-methylimidazolium dicyanamide)/furfuryl alcohol (FA) blends reacting with white fuming nitric acid (WFNA) are investigated using drop test approach. Morphology results from two high speed cameras and temperature profiles from an infrared camera are combined in analyzing the hypergolic process. A typical hypergolic process observed in this work involves a mixing dominant stage, a stage with moderate temperature rising and vapor/secondary droplets emerging, and a stage with violent temperature rising accompanied by flame occurrence. Two kinds of delay times are used to characterize the hypergolic process which are found to be nonmonotonic with the variations of FA fractions. FA, though not hypergolic with WFNA, exhibits extensive pre-ignition heat release due to its physical and chemical properties, which enhances the hypergolic process of [AMIM][DCA]/FA blends with WFNA. © 2022, The Authors. All rights reserved.

关键词： Ionic liquids

来源：评论

学校读者我要写书评

暂无评论

Hydrothermal Hydrolysis Modeling of Lignocellulosic Biomass Using Subcritical Water for Test Packed Bed Reactor

SSRN

引用

SSRN 2023年

作者： Wu, Zhonggang Wang, Jiawei Du, Xiaocheng Su, Hanguang China Nuclear Power Operations Co. Ltd. Shenzhen518116 China Department of Mathematics Physics and Electrical Engineering Northumbria University NewcastleNE1 8ST United Kingdom State Key Laboratory of Multiphase Flow in Power Engineering Xian Jiaotong University Xi'An China School of Information Science and Engineering Northeastern University Shenyang China

In this paper, the subcritical water hydrothermal conversion process of lignocellulosic biomass as porous media in packed bed reactor was investigated by numerical simulation. The computational fluid dynamics mathematical modeling was used to describe the transient multi-physical fields formed during the instantaneous formation process of organic functional groups on the bases of experiment. The effect of inlet hydrothermal fluid velocity and temperature on the transient seepage flow, heat and transfer, and organic conversion reaction were investigated by ANSYS FLUENT® software. The results of the simulation indicate that the osmotic pressure and velocity increase with the hydrothermal fluid velocity and temperature. The surface heat transfer coefficient increases with the hydrothermal fluid velocity and temperature, and may reach the maximum within the scope of this paper. Both experimental and numerical simulation results consistently show that within the first 60 minutes of the hydrothermal reaction, the organic reaction rate is mainly determined by the combined model of turbulent-hydrothermal reaction. For a later time period after 60 minutes, the organic reaction rate mainly depends on the single model of hydrothermal reaction. Comparing the same experimental conditions and their real-time measurements, the numerical results in this paper accord with them. © 2023, The Authors. All rights reserved.

关键词： Porous materials

来源：评论

学校读者我要写书评

暂无评论

Insight into the key Role of Imine Groups in Polyaniline for Adsorbing Heavy Metal Ions: Experimental and Density Functional Theory Study

SSRN

引用

SSRN 2023年

作者： Shi, Bofang Li, Hang Fu, Xiaojie Zhao, Chengcheng Rao, Yongfang Li, Mingtao Komarneni, Sridhar Yang, Honghui Xi’an Key Laboratory of Sustainable Energy Materials Chemistry Department of Applied Chemistry School of Chemistry Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Department of Environmental Science and Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China Department of Ecosystem Science and Management Materials Research Institute 204EEL The Pennsylvania State University University ParkPA16802 United States

In polyaniline (PANI) or polyaniline-based adsorbents, the views on nitrogen group that has the highest chemical affinity to heavy metal ions and dominates the adsorption process remain in debate. Herein, we focus on deciphering the main adsorption sites and adsorption mechanism of PANI using both experiments and density functional theory (DFT) calculations. The characterization results of adsorption product demonstrate that the metal ions were adsorbed via coordination bond between nitrogen atom and metal ion. The theoretical calculations by DFT reveal that −N= group is the key adsorption site rather than other groups in PANI, and the key step of PANI adsorption process is a ligand exchange reaction. The H+ ions with a higher affinity to −N= group can inhibit the adsorption of metal ions due to the consumption of adsorption sites and ion exchange reaction. This work provides a molecular-level understanding of adsorption sites, adsorption mechanism, and H+ competition for metal ion adsorption by PANI, which is beneficial for the development of PANI-based adsorbents. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Study on the effect of particle flow state on the stability of LIBS carbon content detection signal 7

Study on the effect of particle flow state on the stability ...

引用

7th International Conference on power engineering, ICOPE 2019

作者： Pan, Yuqing Hu, Zhengtao Xu, Heng Zhou, Qulan Li, Na Deguchi, Yoshihiro State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Graduate School of Engineering Science Osaka University Japan

Rice husk, a type of biomass fuel, is rich in amorphous silica. Laser-induced breakdown spectroscopy (LIBS) is a fast-responding non-contact detection method which can realize on-line detection of rice ash components. This paper aims to explore the optimum working conditions of LIBS and extend the compatibility of LIBS technology. The paper uses the sample motion state simulation system to simulate ash, so that the particles can be laser-induced breakdown during the vertical drop and horizontal motion, and then the effect of particle flow state on the stability of the LIBS detection signal can be determined. In addition, the paper compares the effects of two laser pulse widths on the stability of LIBS detection signal by using a 1 ns pulse width laser and a 6 ns pulse width laser to improve the detection error. Experimental studies have found that long pulse width laser provides better stability of spectrum, and the relative standard deviation (RSD) of the detection result is smaller than that of short pulse width laser, and the RSD is smaller in the state of horizontally transferring samples, which can obtain the spectral signal with stronger line intensity. Moreover, sample in conveyor, by contrast, leads to more stable signals. © ICOPE 2019 - 7th International Conference on power engineering, Proceedings. All rights reserved.

关键词： Stability

来源：评论

学校读者我要写书评

暂无评论

Two-Phase flow Dynamics in the Coupling Region of Gas Diffusion Layer and Patterned Wettability Metal Foam flow Field in Proton Exchange Membrane Fuel Cells

SSRN

引用

SSRN 2024年

作者： Lv, Xuecheng Zhou, Zhifu Wu, Wei-Tao Wei, Lei Gao, Linsong Lyu, Jizu Li, Yang Yang, Yunjie Li, Yubai Song, Yongchen Key Laboratory of Ocean Energy Utilization and Energy Conservation Ministry of Education Dalian University of Technology Dalian116024 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'An710049 China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China School of Mechanical Engineering and Mechanics Xiangtan University Xiangtan411105 China School of Mechanical Engineering Guangdong Ocean University Zhanjiang524088 China

In this study, the 3D structures of the gas diffusion layer (GDL) and metal foam flow field (MFF) in proton exchange membrane fuel cells (PEMFCs) were reconstructed by X-ray computed tomography, and the two-phase flow in the GDL-MFF coupling region was simulated by phase-field Lattice Boltzmann method (LBM). A comparative analysis of the two-phase flow characteristics was conducted between hydrophobic metal foam (HMF) and patterned wettable metal foam (PWMF). The effect of the wettability and size of the hydrophilic regions in PWMF was investigated. The results demonstrate that PWMF offers several advantages, including rapid removal of liquid water at the GDL-MFF interface, low liquid water coverage at the GDL-MFF interface, enhanced vertical gas convection in the GDL, low and stable pressure drop in the MFF, stable gas turbulent intensity in the MFF, and a more uniform gas velocity distribution. However, PWMF may slow down the transport of liquid water from the GDL to the MFF, increase the water saturation in the GDL, and reduce the drainage rate of the flow field. Proper adjustment of the contact angle and size of the hydrophilic regions in PWMF can alleviate these drawbacks. © 2024, The Authors. All rights reserved.

关键词： Two phase flow

来源：评论

学校读者我要写书评

暂无评论

Xct Images-Based Modeling for Elucidating Electrochemical Inert Phase-Dependent Multiscale Electrode Kinetic Behaviors

SSRN

引用

SSRN 2024年

作者： Huang, Heng Zhou, Zhifu Wu, Wei-Tao Wei, Lei Lyu, Jizu Hu, Chengzhi Gao, Linsong Li, Yubai Song, Yongchen Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian116023 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'An710049 China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China School of Mechanical Engineering Guangdong Ocean University Zhanjiang524088 China School of Mechanical Engineering and Mechanics Xiangtan University Xiangtan411105 China

The structure and spatial distribution of electrochemical inert phase (EIP) in electrodes are highly heterogeneous, which deteriorates the performance of electrodes under harsh operating conditions such as high-rate or low-temperature. In this work, with the assist of digitally processed X-ray computed tomography (XCT) for charactering images of LiNi0.5Co0.2Mn0.3 electrode, the electrodes with different EIP geometries are reconstructed, and the dependence of electrode performance degradation on EIP is elucidated from a multiscale perspective. Physical structure characterization and 3D microstructure resolved model reveal that, compared to 3D bulk EIP (B-EIP), 2D film EIP (F-EIP) tends to cover active surface of active material (AM), which exacerbates the heterogeneous electrode lithiation reaction. The decrease of AM active surface area makes the state of lithiation (SOL) of particles closely related to their active specific surface area (αa). The temperature sensitivity of electrodes at low temperatures exacerbates the hazard of αa loss, allowing heterogeneous reaction transfer between particles. The Biot number (Bi) evaluates the competing mechanisms between interfacial reactions and bulk diffusion of particles, and the reaction rate at the particle/electrolyte interface is accelerated in high content EIP electrodes, allowing the Li concentration gradient within the particles to be dominated by interfacial reactions. Finally, the electrochemistry and heat generation from particle to electrode level in high area-loaded electrodes are explored, showing that the lithium ion diffusion in the pores controls the interfacial reactions and heat transport behavior. The aggregated high flux reactions and localized hot spots aggravate the heterogeneous degradation and side reactions of the electrode. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：