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Design of a graphene oxide@melamine foam/polyaniline@erythritol composite Phase change material for thermal energy storage

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Chinese Journal of Chemical Engineering 2023年第6期58卷 282-290页

作者： Jianhui Zhou Xin Lai Jianfeng Hu Haijie Qi Shan Liu Zhengguo Zhang State Key Laboratory of Advance Power Transmission Technology(State Grid Smart Grid Research Institute Co.Ltd.) Beijing 102209China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

At present,only a single modification method is adopted to improve the shortcomings of erythritol(ET)as a Phase change material(PCM).Compared with a single modification method,the synergistic effect of multiple modification methods can endow ET with comprehensive performance to meet the purpose of package,supercooling reduction,and enhancement of thermal conductivity.In this work,we innovatively combine graphene oxide(GO)nanosheet modified melamine foam(MF)and polyaniline(PANI)to construct a novel ET-based PCM by blending and porous material adsorption modification.PANI as the nucleation center can enhance the crystallization rate,thereby reducing the supercooling of ET.Meanwhile,GO@MF foam can not only be used as a porous support material to encapsulate ET but also as a heat conduction reinforcement to improve heat storage and release rate.As a result,the supercooling of GO@MF/PANI@ET(GMPET)composite PCM decreases from 91.2℃ of pure ET to 57.9℃ and its thermal conductivity(1.58 W·m^(-1)·K^(-1))is about three times higher than that of pure ET(0.57 W·m^(-1)·K^(-1)).Moreover,after being placed at 140℃ for 2 h,there is almost no ET leakage in the GMPET composite PCM,and the mass loss ratio is less than 0.75%.In addition,the GMPET composite PCM displays a high melting enthalpy of about 259 J·g^(-1) and a high initial mass loss temperature of about 198℃.Even after the 200th cycling test,the phase transition temperature and the latent heat storage capacity of the GMPET PCM all remain stable.This work offers an effective and promising strategy to design ET-based composite PCM for the field of energy storage.

关键词： Composites Enthalpy Heat conduction Nucleation Phase change

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A novel method for modeling the Phase change of iron ore particles in the cohesive zone of a blast furnace

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Particuology 2024年第3期86卷 252-261页

作者： Dianyu E Yingming Wen Jiayun Dan Youyuan Jiang Guangchao Wei Jiaxin Cui Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan411101China Schoolof Transportation and Vehicle Enginering Shandong University of TechnologyZibo255000China

Cohesive zone plays a vital role in the stable operation of a blast furnace(BF),yet the complex Phase change process of iron ore particles in this zone is still not well understood.In this study,a novel one-dimensional(1D)unsteady Phase change model was developed to elucidate the heat transfer and melting mechanisms of iron ore particles.After model validation,the effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on the Phase change behavior of iron ore particles were analyzed,and the joint effect of multiple parameters was discussed.The results show that larger-sized iron ore particles possess lower specific surface areas,which in turn reduces their convective heat absorption capacity.Consequently,the distance from the solid-liquid phase interface to the particle surface increases,thereby slowing down the movement of the phase interface and pro-longing the melting duration of the particles.Increasing the gas velocity and the initial temperature does not have a significant impact on reducing the duration of the complete melting process.Under the specified conditions,it is observed that increasing the gas velocity by 3-fold and 9-fold results in a reduction of the melting duration by 2.4%and 8.3%,respectively.Elevating the initial temperature of iron ore particles results in a decrease in the core-to-surface temperature difference,a slower heating rate,and a shorter duration to achieve melting.Among the factors affecting the melting process,the particle diameter is found to be the most significant in terms of the liquid phase precipitation,mushy zone thickness,and core-to-surface temperature difference of iron ore particles.

关键词： Blast furnace Iron ore melting Cohesive zone Heat transfer Phase change

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Molecular Dynamics Study on the Mechanism of Nanoparticle Phase change Caused by Collision with Wall Surface

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Journal of Thermal Science 2022年第4期31卷 1145-1154页

作者： LI Jiawei WANG Guanbang ZHANG Xinrong Department of Energy and Resources Engineering College of Engineering Peking University Beijing 100871China Beijing Engineering Research Center of City Heat Peking University Beijing 100871China

The collision between the nanoparticle and wall surface is supposed to cause the escape of nanoparticle molecules which indicates the potential Phase change of the nanoparticle.It is significant to understand the mechanism of the collision process involved with Phase change for applications of nanoparticles in energy and mass transfer.In this study,the collision process between nanoparticle made of monatomic argon molecule and wall surface made of nickel metal crystal is simulated by molecular dynamics method.The travelling behavior and energy transformation of escaped molecules are respectively analyzed.The effects of the intermolecular force and initial temperature on the collision process are further discussed.The results show that the nanoparticle can be accelerated by the wall surface with the intermolecular force and finally collide with it.The molecules escape from the nanoparticle either by bouncing off the wall surface or the intermolecular energy exchange with the energy transformation between the potential energy and kinetic energy.The molecules far from the nanoparticle center are more likely to escape,while the velocity distributions of the escaped molecules follow the Maxwell distribution.More escaped molecules,namely higher Phase change potential,are observed with lower intermolecular force and higher initial temperature.As a fundamental study on nanoparticle Phase change in the vicinity of wall surface,the present investigation will be helpful for further study on the heat transfer characteristics and Phase change mechanisms of nanoparticles.

关键词： collision molecule escape nanoparticle Phase change wall surface

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The influence of pore size distribution on thermal conductivity,permeability, and Phase change behavior of hierarchical porous materials

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Science China(Technological Sciences) 2021年第11期64卷 2485-2494页

作者： LIU XiangLei SONG FangZhou XU Qiao LUO QingYang TIAN Yang LI JiaWei YANG XinMeng JIN Yi School of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key L aboratory of Thermal Management and Energy Utilization of Aviation Vehicles Ministry of Industry and Information Technology'Nanjing 210016China Jiangsu Jinhe Energy Technology Co.Lfd. Zhenjiang 212000China

Porous foams have been widely employed to improve heat storage rate and prevent leakage of Phase change materials(PCMs).Actual porous foams have non-uniform or hierarchical pore size distribution, which is usually neglected in most researches.Here, we establish hierarchical porous models considering different pore size distributions by using Voronoi tessellations. Effects of pore size distribution on thermal conductivity, permeability, and Phase change behavior of hierarchical porous foams/PCMs composites are investigated. Uneven pore size distributions are found to decrease the thermal conductivity of porous foams to some extent. On the other hand, the permeability can be reduced by 27.6%, and the heat storage rate can be improved by 7.7% by introducing moderate hierarchy without changing the total porosity. This work opens a new route to enhance heat storage performance of PCMs via leveraging hierarchy of pore size distribution of porous foams.

关键词： pore size distribution heat storage performance Phase change hierarchical porous materials

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Thermal tunable one-dimensional photonic crystals containing Phase change material

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Chinese Physics B 2020年第10期29卷 294-299页

作者：贾渊琳任佩雯范春珍 School of Physics and Microstructures Zhengzhou UniversityZhengzhou 450001China

To obtain the adjustable photonic crystals (PCs), we numerically investigate one-dimensional (1D) PCs with alternating VO2 and SiO2 layers through transfer matrix method. The dispersion relation agrees well with the transmittance obtained by the finite element calculation. Tunable band gaps are achieved with the thermal stimuli of VO2, which has two crystal structures. The monoclinic crystal structure VO2 (R) at low temperature exhibits insulating property, and the high temperature square rutile structure VO2 (M) presents metal state. Concretely, the bandwidth is getting narrower and red shift occurs with the higher temperature in VO2 (R)/SiO2 PCs structure. Based on the Phase change characteristics of VO2, we can flexibly adjust the original structure as VO2 (R)/VO2 (M)/SiO2. By increasing the phase ratio of VO2 (R) to VO2 (M), the band gap width gradually becomes wider and blue shift occurs. The discrete layers of gradient composites on the dispersion of 1D PCs are also investigated, which enhances the feasibility in practical operation. Thus, our proposed thermal modulation PCs structure paves a new way to realize thermal tunable optical filters and sensors.

关键词： photonic crystals VO2 thermal modulation Phase change

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A CO_(2)-controllable Phase change absorbent solvent used to waste recycling of dining lampblack

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Chinese Journal of Chemical Engineering 2023年第9期61卷 110-117页

作者： Wenjian Yue Xiaojiang Li Junhao Jing Li Tong Na Wang Hongsheng Lu Zhiyu Huang College of Chemistry and Chemical Engineering Southwest Petroleum University Chengdu 610500China Engineering Research Center of Oilfield Chemistry Ministry of EducationChengdu 610500China Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province Chengdu 610500China Chongqing University of Science and Technology Chongqing 401331China

Dining lampblack as a source of atmospheric pollution,urban residents had to spend a lot of economic costs all year round to solve its impact.However,traditional treatment methods often carry the risk of secondary pollution.The use of Phase change absorption solvent(PCAS)controlled by CO_(2)can effectively absorb the oily components in dining lampblack,and smoothly avoid the generation of secondary pollutants and squandering of resources.The reversibility of PCASs under CO_(2)control was explained by pH changes and macroscopic visualizations.The absorption effects of favorable absorbents and PCASs on dining lampblack were compared and analyzed.The fatty acid(FA)in the oil absorption mixture was desorbed by interacting with D230.The results of GC/MS analysis on the oil components separated by desorption showed that the desorption of PCASs was effective for these refractory oil components.FAs can be enriched and applied to the subsequent dining lampblack treatment link to realize the waste recycling.In addition,the absorption and desorption of oily components by PCASs were combined with the CO_(2)-controlled phase transformation of PCASs itself to achieve the absorption circulation of treating dining lampblack by using PCASs.

关键词： Dining lampblack CO_(2)-switchable Phase change Absorption Waste recycling Solvents

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Shikimic acid accelerates Phase change and flowering in Chinese jujube

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Horticultural Plant Journal 2024年第2期10卷 413-424页

作者： Xianwei Meng Zhiguo Liu Li Dai Weiqiang Zhao Jiurui Wang Lili Wang Yuanpei Cui Ying Li Yinshan Cui Yao Zhang Luyao Wang Fengjiao Yu Jin Zhao Mengjun Liu Research Center of Chinese Jujube Hebei Agricultural UniversityBaodingHebei 071000China College of Horticulture Hebei Agricultural UniversityBaodingHebei 071000China College of Life Science Hebei Agricultural UniversityBaodingHebei 071000China College of Forestry Hebei Agricultural UniversityBaodingHebei 071000China eCollege of Economics and ManagementHebei Agricultural UniversityBaodingHebei 071000China College of Economics and Management Hebei Agricultural University

The juvenile-to-adult Phase change with first flowering as the indicator plays a crucial role in the lifecycle of fruit trees. However, the molecular mechanisms underlying Phase change in fruit trees remain largely unknown. Shikimic acid (ShA) pathway is a main metabolic pathway closely related to the synthesis of hormones and many important secondary metabolites participating in plant Phase change. So,whether ShA regulates Phase change in plants is worth clarifying. Here, the distinct morphological characteristics and the underlying mechanisms of Phase change in jujube (Ziziphus jujuba Mill.), an important fruit tree native to China with nutritious fruit and outstanding tolerance abiotic stresses, were clarified. A combined transcriptome and metabolome analysis found that ShA is positively involved in jujube(Yuhong’×Xing 16’) Phase change. The genes in the upstream of ShA synthesis pathway (ZjDAHPS, ZjDHQS and ZjSDH), the contents of ShA and the downstream secondary metabolites like phenols were significantly upregulated in the Phase change period. Further, the treatment of spraying exogenous ShA verified that ShA at a very low concentration (60 mg·L^(-1)) can substantially speed up the Phase change and flowering of jujube and other tested plants including Arabidopsis, tomato and wheat. The exogenous ShA (60 mg·L^(-1)) treatment in jujube seedlings could increase the accumulation of endogenous ShA, enhance leaf photosynthesis and the synthesis of phenols especially flavonoids and phenolic acids, and promote the expression of genes (ZjCOs, ZjNFYs and ZjPHYs) involved in flowering pathway. Basing on above results, we put forward a propose for the underlying mechanism of ShA regulating Phase change, and a hypothesis that ShA could be considered a phytohormone-like substance because it is endogenous, ubiquitous, movable and highly efficient at very low concentrations. This study highlights the critical role of ShA in plant Phase change and its phytohormone-like properties.

关键词： Ziziphus jujuba Mill. Phase change Flowering Shikimic acid Transcriptome Metabolome

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Selective triggering of Phase change in dielectrics by femtosecond pulse trains based on electron dynamics control

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Chinese Physics B 2013年第4期22卷 334-337页

作者：徐传彩姜澜冷妮刘鹏军 Laser Micro/Nano-Fabrication Laboratory School of Mechanical Engineering Beijing Institute of Technology

In this study we experimentally reveal that the Phase change mechanism can be selectively triggered by shaping femtosecond pulse trains based on electron dynamics control （EDC）, including manipulation of excitations, ionizations, densities, and temperatures of electrons. By designing the pulse energy distribution to adjust the absorptions, excitations, ionizations, and recombinations of electrons, the dominant Phase change mechanism experiences transition from nonthermal to thermal process. This phenomenon is observed in quadruple, triple, and double pulses per train ablation of fused silica separately. This opens up possibilities for controlling Phase change mechanisms by EDC, which is of great significance in laser processing of dielectrics and fabrication of integrated nano- and micro-optical devices.

关键词： Phase change electron dynamics pulse shaping

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Radial integral boundary element method for simulating Phase change problem with mushy zone

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1155-1170页

作者： Hongxiao YAO Weian YAO Chong ZUO Xiaofei HU State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024Liaoning ProvinceChina International Center for Computational Mechanics Dalian University of TechnologyDalian 116024Liaoning ProvinceChina Sany Heavy Industry Co.Ltd. Wuhan 430100China

A radial integral boundary element method(BEM)is used to simulate the Phase change problem with a mushy zone in this paper.Three phases,including the solid phase,the liquid phase,and the mushy zone,are considered in the Phase change problem.First,according to the continuity conditions of temperature and its gradient on the liquid-mushy interface,the mushy zone and the liquid phase in the simulation can be considered as a whole part,namely,the non-solid phase,and the change of latent heat is approximated by heat source which is dependent on temperature.Then,the precise integration BEM is used to obtain the differential equations in the solid phase zone and the non-solid phase zone,respectively.Moreover,an iterative predictor-corrector precise integration method(PIM)is needed to solve the differential equations and obtain the temperature field and the heat flux on the boundary.According to an energy balance equation and the velocity of the interface between the solid phase and the mushy zone,the front-tracking method is used to track the move of the interface.The interface between the liquid phase and the mushy zone is obtained by interpolation of the temperature field.Finally,four numerical examples are provided to assess the performance of the proposed numerical method.

关键词： Phase change mushy zone boundary element method(BEM) precise integration method(PIM)

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Phase change memory

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Science China(Information Sciences) 2011年第5期54卷 1061-1072页

作者： LAM Chung IBM Research T.J. Watson Research Center Yorktown Heights New York 10598 USA

Phase change memory (PCM) is a non-volatile solid-state memory technology based on the large resistivity contrast between the amorphous and crystalline states in Phase change materials. We present the physics behind this large resistivity contrast and describe how it is being exploited to create high density PCM. We address the challenges facing this technology, including the design of PCM cells, fabrication, device variability, thermal cross-talk and write disturb. We discuss the scalability, assess the performance, and examine the reliability of PCM including data retention, multi-bit storage and endurance.

关键词： solid state memory non-volatile DRAM flash Phase change resistive memory data retention write endurance solid-state drive computer memory

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