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Concentrated Multi-nozzle Electrospinning
Yuekun Zheng,Huatang Cao,Zhou Zhou,Xuecui Mei,Lingke Yu,Xiaojun Chen,Gonghan He,Yang Zhao,Dezhi Wu,Daoheng Sun 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
The multi-nozzle electrospinning is under extensive investigations because it is an easy way to enhance theproductivity and also feasible to produce special structure fibers such as core-shell fibers and to fabricate composite fibers ofthose polymers that cannot form blend solution in common solvent. Control over the multi-nozzle electrospinning fibersdeposition has attracted increasing attentions. The most common method was to use the auxiliary electrode. However, theconcentrated effect of the works of control multi-nozzle electrospinning deposit was inconspicuous. To enhance thecontrolling of multi-nozzle electrospinning deposition, a set-up based oppositely charged electrospinning was designed. Inthis set-up the air flow was used to transport neutralized nanofibers. This electrospinning method was named oppositelycharged and air auxiliary electrospinning (OCAAES). The capacity of OCAAES in deposition area and pattern controllingwere investigated. By the OCAAES, concentrated and several patterned nanofibers deposition were fabricated. Resultsshowed that nanofiber deposition area and pattern of multi-nozzle electrospinning could be controlled actively, and nanofiberdeposition could be fabricated in a quick thickening rate.
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Multi-scale Modeling for the Stress Analysis of Acrylic Joints in a Hybrid Structure
Yanfeng Zheng,Yaozhi Luo,Xian Xu,Chao Yang,Zhongyi Zhu,Yuekun Heng 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
The central detector at the Jiangmen Underground Neutrino Observatory (JUNO) is a hybrid structure system consisting of an inner acrylic sphere and an outer stainless steel reticulated shell. The stress distributions of the acrylic joints must be accurately simulated to avoid “crazing”. To balance the accuracy and effi ciency of the stress analysis, a multi-scale modeling method using mixed-dimensional coupling is proposed. A framework and a generalized procedure are developed to instruct the modeling and analysis. A multi-scale model consisting of a single refi ned acrylic joint and equipped with simplifi ed joints is proposed and discussed. A comparison of the results using the multi-scale model with a cluster of 3 × 3 refi ned joints reveals that the diff erence is less than 5%, while the ratio of the computation resource cost and the time consumption is approximately only 1/7 and 1/5, respectively. The stress distributions of the acrylic joints in the central detector are obtained using the proposed multi-scale model.
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