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- 저자 : Junxiong Zhang (검색결과 3 건)
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Jianying Gong,Xiong Zhang,Junxiong Zeng,Tieyu Gao,Weifeng Wu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
Oblique ribs are widely applied to the internal cooling of turbine blades to promote the heat transfer between blade wall and coolant. In this study, the effect of several new types of truncated ribs on the heat transfer characteristics in 45° oblique rib channels is investigated experimentally and numerically. The numerical results obtained by the SST k-ω turbulence model agree well with the experimental data for the Reynolds number ranging from 10000 to 60000. The results indicate a significant entrance effect on the heat transfer in truncated rib channels. The numerical results show that ribs continuously truncated at 3.8 mm gives the best heat transfer performance among the newly truncated ribs. Compared with the original structure, the Nusselt number and heat transfer enhancement factor of newly truncated ribs increased by 24.6 % and 17.8 %, respectively. Concurrently, the friction factor is reduced by 5.1 %.
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Tengzhou Xu,Zhaofeng Chen,Yong Yang,Zhou Chen,Junxiong Zhang,Cao Wu,Yang Liu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
Vacuum insulation panel (VIP), which is composed of an evacuated core material encapsulated in an envelope and supplemented with a desiccant, is a high performance thermal insulation material. In this paper, thermos-physical properties of chopped fiber, centrifugal-spinneret-blow (CSB) fiber, flame-spinneret-blow (FSB) fiber and hybrid (CSB: FSB=1:1) fiber as fillers of vacuum insulation panel are explored. The results show that the increase of pore size can improve thermal insulation property; fibers distribute in 2-D structure, which can reduce the heat conduction, leads to reduce the thermal conductivity. VIP with chopped fiber has the best thermal insulation, and thermal conductivity is 1.4 mW/m.K. Due to difference of core materials, thermal insulation characteristics of VIP can be divided into three distinct regions based on the internal pressure range, i.e., (I) ≥12000 Pa region, (II) 80-12000 Pa region, (III) ≤ 80 Pa region. It also finds that service life of VIP can be improved by the reducing the pore size of core materials. VIP with different core materials shows different degradation and the degradation rate of VIP with FSB core material is minimum.
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Innovation Agglomeration and Chinese Spatial Economic Disparities
Jun Xiong,Wen-Wu Zhang 한국유통과학회 2015 한국유통과학회 학술대회 논문집 Vol.2015 No.-
Optimizing distribution of innovative capitals and promoting collaborative innovation are important ways to achieve regional coordinated development in China. Using panel data of 30 China’s provinces during the period of 1990~2010,this paper studies effects of innovation agglomeration on the industrial agglomeration and economic growth. The study results show that: Innovative capital accumulation is an important feature in China, but the accumulation degrees of innovative capital between provinces are very different. Meanwhile, knowledge spillovers show strong geographical limitation. Innovation agglomeration and local knowledge spillovers play significant roles on promoting industrial agglomeration and the region's economic growth. But the uneven distribution of innovation plus the diminishing knowledge spillovers effect may lead to a further degree of regional income disparities.
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