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RISS 인기검색어
- 검색키워드
- 저자 : Yuansheng Lin (검색결과 4 건)
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Effects of Temperature on Melt Electrospinning: Experiment and Simulation Study
Xiaoqi Mu,Yuansheng Zheng,Xueqin Li,Binjie Xin,Lantian Lin 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4
In this study, the jet formation progress, jet motion, resultant fiber diameter, fiber mat morphology, inner structuresand mechanical properties of the fibers prepared at different heating temperatures via melt electrospinning system werestudied, in a comprehensive and systematic manner. The temperature distribution of the melt electrospinning configurationwas simulated, in order to provide a good deal of insight into the experimental results. High-speed photography was adoptedto capture the images of jet formation process and jet motion during melt electrospinning. The experimental results showedthat higher heating temperature at the spinneret results in shorter jet formation time, smaller fiber diameter, more disorderedfiber mat, lower degree of crystallinity and strength. The simulation works was carried out, aimed at facilitating to deeplyunderstand the experimental results.
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The Effects of Electric Field on Jet Behavior and Fiber Properties in Melt Electrospinning
Xueqin Li,Yuansheng Zheng,Xiaoqi Mu,Binjie Xin,Lantian Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
The electric field and temperature are the two important factors that influence the diameter and properties of fiberin the melt electrospinning process. It is commonly known that the polymer jet behavior is governed by the electric fieldwithin spinning area. In present work, a comprehensively-designed and properly-conducted analysis was carried out toinvestigate into the effects of electric field on the jet behaviors, diameters, crystalline structure and mechanical properties ofthe resultant fibers. An auxiliary electrode was invited to enhance the electric field strength. The high-speed photography wasadopted to capture the jet motion, and also, the numerical simulation was used to understand the electric field distribution. Bymaking use of the whipping amplitude and whipping frequency, the characteristics of jet behavior were described. It wasfound that by applying an auxiliary electrode, the average fiber diameter reduced from 61.01 μm to 9.06 μm, and thecrystallinity and strength of the fiber was improved with the help of the higher electric filed intensity. In addition, the moreuniform electric field would produce finer and more uniform fiber because of the more stable jet motion.
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Effects of Electric Filed on Electrospray Process: Experimental and Simulation Study
Xuan Dong,Yuansheng Zheng,Binjie Xin,Huaiyuan Liu,Lantian Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
At present, there exists a widely-held view that electric field plays an extremely important role in the electrosprayprocess. Aimed at investigating into the effects of electric field distribution and intensity on the electrospray process andresultant microsphere diameter, a variety of necessary and relevant tests were performed in this study by inviting an auxiliaryelectrode ring. The three-dimensional electric fields of the electrospray system were simulated, in addition, high-speedphotography was adopted to recognize the electrospray modes. The results of a series of electrospray experiments demonstratedthat not only electrospray mode but also resultant microsphere diameters are influenced, to a considerable degree, by the electricfield. Such simulation results were verified by above-mentioned experiments that from higher electric field intensity comessmaller microsphere diameter, due to the fission caused by the surface charge, and besides, more uniform electric fielddistribution produces more uniform microsphere diameter.
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Jinlan Gou,Kelong Zhang,Yuansheng Lin,Yong Li,Can Ma,Hanbing Ke 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
The compressor is one of the key components in the closed supercritical carbon dioxide (S-CO 2 ) Brayton cycle, but its design method is far from mature. It is naturally expected that the well-established design method of the air compressor can provide favorable guidelines, on the basis of further understanding the effects of the physical property on the compressor flow field. Considering that isentropic compression is one of the core physical processes in the compressor, the physical property effects on this process were mainly investigated in this work. Similarity criterion was considered, and the change rate discrepancy of the main variables in this process between S-CO 2 and the ideal air was fully analyzed. Results show that S-CO 2 is compressed faster than the ideal air in most cases, along with generating smaller Mach number and larger pressure rise ratio. It is noted the important parameter of the static pressure coefficient distribution with S-CO 2 in the compression process is almost the same as that with the ideal air at low Mach number, which is conductive to the extension of the air compressor research experience, but it is quite different at high Mach number. The simulation cases about compressor cascade are further applied and prove the suitability of the revealed physical property effects in the compressor passage. Understanding these effects on the compression process is helpful to improve the design method of the S-CO 2 compressor.
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