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离子液体法微晶纤维素/聚乙烯醇共混膜的制备及性能 被引量:3
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作者 宋洪赞 罗志强 +2 位作者 郭晓玲 高俊刚 张军 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2013年第6期157-159,164,共4页
以离子液体为微晶纤维素(MCC)和聚乙烯醇(PVA)的共溶剂,采用液-固相转变法制备MCC/PVA共混膜。共混膜经红外光谱(FT-IR)、扫描电镜(SEM)、热重分析(TGA)、接触角测试和拉力试验等表征。FT-IR和SEM分析结果表明,两组分间有很好的相容性,... 以离子液体为微晶纤维素(MCC)和聚乙烯醇(PVA)的共溶剂,采用液-固相转变法制备MCC/PVA共混膜。共混膜经红外光谱(FT-IR)、扫描电镜(SEM)、热重分析(TGA)、接触角测试和拉力试验等表征。FT-IR和SEM分析结果表明,两组分间有很好的相容性,用甲醇做沉淀剂可以制备出孔径均一的纳米共混膜。TGA和力学性能测试结果表明,共混膜具有良好的综合热稳定性、拉伸强度及尺寸稳定性。 展开更多
关键词 纤维素 聚乙烯醇 离子液体 共混膜 液-固相转变法
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Entransy dissipation minimization for liquid-solid phase change processes 被引量:41
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作者 XIA ShaoJun,CHEN LinGen & SUN FengRui Postgraduate School,Naval University of Engineering,Wuhan 430033,China 《Science China(Technological Sciences)》 SCIE EI CAS 2010年第4期960-968,共9页
The liquid-solid phase change process of a simple one-dimensional slab is studied in this paper.By taking entransy dissipation minimization as optimization objective,the optimal external reservoir temperature profiles... The liquid-solid phase change process of a simple one-dimensional slab is studied in this paper.By taking entransy dissipation minimization as optimization objective,the optimal external reservoir temperature profiles are derived by using optimal control theory under the condition of a fixed freezing or melting time.The entransy dissipation corresponding to the optimal heat exchange strategies of minimum entransy dissipation is 8/9 of that corresponding to constant reservoir temperature operations,which is independent of all system parameters.The obtained results for entransy dissipation minimization are also compared with those obtained for the optimal heat exchange strategies of minimum entropy generation and constant reservoir temperature operations by numerical examples.The obtained results can provide some theoretical guidelines for the choice of optimal cooling or heating strategy in practical liquid-solid phase change processes. 展开更多
关键词 liquid-solid phase change process entransy DISSIPATION MINIMIZATION optimal control FINITE time THERMODYNAMICS GENERALIZED THERMODYNAMIC optimization
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Experimental and numerical investigation of liquid-solid binary fluidized beds: Radioactive particle tracking technique and dense discrete phase model simulations 被引量:3
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作者 Varsha Jain Lipika Kalo +2 位作者 Deepak Kumar Harish J. Pant Rajesh K. Upadhyay 《Particuology》 SCIE EI CAS CSCD 2017年第4期112-122,共11页
Liquid-solid binary fluidized beds are widely used in many industries. However, the flow behavior of such beds is not well understood due to the lack of accurate experimental and numerical data. In the current study, ... Liquid-solid binary fluidized beds are widely used in many industries. However, the flow behavior of such beds is not well understood due to the lack of accurate experimental and numerical data. In the current study, the behavior of monodisperse and binary liquid-solid fluidized beds of the same density but dif- ferent sizes is investigated using radioactive particle tracking (RPT) technique and a dense discrete phase model (DDPM). Experiments and simulations are performed in monodisperse fluidized beds containing two different sizes of glass beads (0.6 and I mm) and a binary fluidized bed of the same particles for vari- ous bed compositions. The results show that both RPT and DDPM can predict the mixing and segregation pattern in liquid-solid binary fluidized beds. The mean velocity predictions of DDPM are in good agree- ment with the experimental findings for both monodisperse and binary fluidized beds. However, the axial root mean square velocity predictions are only reasonable for bigger particles. Particle-particle interac- tions are found to be critical for predicting the flow behavior of solids in liquid-solid binary fluidized beds. 展开更多
关键词 Binary bed liquid-solid flow Fluidized bed Radioactive particle tracking Dense discrete phase model
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Numerical Simulation of EDM Gap Flow Field
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作者 阎换新 赵万生 郭永丰 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1999年第2期69-72,共4页
Conductive or send-conductive powder added into dielectric fluid can obviously lower the roughness of workpiece. With a mathematical ed developed to show the movement of dielectric fluid and powder particles in the ga... Conductive or send-conductive powder added into dielectric fluid can obviously lower the roughness of workpiece. With a mathematical ed developed to show the movement of dielectric fluid and powder particles in the gap flow field and a numerical algorithm proposed for the model, the distribution of powder particle conentration in the gap flow field is simulated with different jets for EDM. 展开更多
关键词 EDM simulation JET FLUSHING liquid-solid phase flow
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Phase difference and interference between reflected cylindrical wave and head wave at a liquid/solid interface
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作者 FU Deyong LIU Liang +1 位作者 CHEN Yifang ZHU Guozhen 《Chinese Science Bulletin》 SCIE EI CAS 2001年第18期1556-1560,共5页
The reflected field of pulsed cylindrical waves from a liquid-solid interface is studied by the numerical method and the experimental method. The reflected field is calculated and shown in gray pictures. The calculate... The reflected field of pulsed cylindrical waves from a liquid-solid interface is studied by the numerical method and the experimental method. The reflected field is calculated and shown in gray pictures. The calculated incident angles θn (n=1, 2, 3, ...) of a series of minimums (or nulls) on the reflected wavefront are presented. The measured angle of the minimum from Schlieren photograph is consistent with that by calculation. The appearance of minimums is explained by the interference between the reflected wave and the head wave, and by the radiated dissipation of the head wave. The leading phase angle of the head wave to the reflected wave is proved to be about 3π/4 by the numerical calculation. 展开更多
关键词 liquid-solid interface TRANSIENT field of CYLINDRICAL WAVES head WAVE and reflected WAVE phase DIFFERENCE and interference.
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