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与气体间非绝热损失的存在使得脉管要达到较高的膨胀效率需采用更大的体积;脉管体积直接影响管壁和管内气体的温度分布,从而影响管壁与气体间的热损失以及气体自身温度不均匀产生的热损失;若对脉管进行一维或绝热假设忽略脉管热损失的影响,则会使脉管尺寸的设计值偏离实际最佳值.关键词:二维;非绝热;脉管体积;脉管效率Pulse tube losses mechanism based on a two...-adiabatic CFD model was proposed to study the relationship between the void volume and expansion efficiency of pulse tube at 80-300 K. The gas physical parameters were analyzed. The results show......
be paid to the properties of surrounding rock mass and the applied support pressure to maintain the stability of tunnel can be determined for a given reliability index. Key words: rectangular tunnel; limit... introduced an exact solution in the realm of the plasticity for the evaluation of collapse mechanisms in the cross- section of a rectangular tunnel. The advantage of the procedure lies in the extreme......
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Deformation Mechanism of Hot Spinning of NiTi Shape Memory Alloy Tube Based on FEM江树勇Industrial Training Centre,Harbin Engineering University摘 要:As a successively and locally plastic deformation process, ball spinning is applied to manufacturing thin-walled Nickel-Titanium shape memory alloy (NiTi SMA) tube at high temperature. NiTi SMA tube blank......
J. Cent. South Univ. (2016) 23: 362-369 DOI: 10.1007/s11771-016-3081-5 Optimal design of functionally graded PmPV/CNT nanocomposite cylindrical tube for purpose of torque transmission Abolfazl... mass and high strength. In this work, a cylindrical tube which is made up of functionally graded (FG) PmPV/CNT nanocomposite, is optimally designed for the purpose of torque transmission. The main......
of reinforced concrete rectangular beams considering reinforcement corrosion ZHENG Hao1, ZHENG Shansuo1, 2, HE Jinchuan3, ZHANG Yixin1, SHANG Zhigang1 (1. School of Civil Engineering, Xi’an University...) rectangular beams considering reinforcement corrosion, accelerated corrosion tests were applied to six RC rectangular beam specimens using the artificial climatic environment method. Quasi-static......
码:A 文章编号:1672-7207(2012)02-0675-06 Wind-induced vibration of fluid-structure interaction system for rectangular aqueduct LIU Liang, ZHANG Hua, GAO Yu-wei (College of Civil Engineering and Traffic Engineering, Hohai University, Nanjing 210098, China) Abstract: Based on rectangular aqueduct structures, the wind response of aqueduct-water coupling......
electromagnetic field and magnetic field’s symmetric excited by rectangular loop LI Jian-hui1, LIU Shu-cai2, ZHU Zi-qiang1, LU Guang-yin1, ZHAO Xiao-bo1, ZHAO Shuang-qiu1 (1. School of Info-physics... the electric field excited by vertical magnetic dipole, the total electric field excited by a rectangular loop was deduced using loop area integral for magnetic moment. Based on Faraday law......
, it has the trend that the heat transfer coefficient displays worse with increasing the concentration.Key words:nanofluid; heat transfer characteristic; circular tube; metallic particles......
Experiment Study on Self-stress of High-strength, Low-heat and Micro-expansion Concrete-filled Steel Tube卢哲安摘 要:The self-stress trial of the fifteen high-strength, low-heat and micro-expansion concrete-filled steel tube( CFST) is introduced, and the generating and distributing features of pre-stress and its relation to adding quantity of expansive agent......