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包晶合金定向凝固过程中的对流效应及带状组织形成机制 Ⅰ.实验结果骆良顺1,2,张宇民1,苏彦庆2,王新2,郭景杰2,傅恒志2(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院2.黑龙江省哈尔滨市哈尔滨工业大学特种环境复合材料技术国防科技重点实验室)摘 要:利用电阻加热和感应加热Bridgman定向凝固系统对非小平面包晶系模型合金Fe-Ni合金进行系统的定向凝固实验研究,探索2种常规定向凝固条件下对流对包晶合金定向凝固过程中带状组织和宏观偏析的影响规律.发现在高G/V定向凝固过程中,对流使包晶合金定向凝固过程......
ARTICLE J. Cent. South Univ. (2019) 26: 1089-1098 DOI: https://doi.org/10.1007/s11771-019-4073-z Numerical analysis on forced convection enhancement in an annulus using porous ribs and nanoparticle... transfer enhancement; internal flow Cite this article as: Majid SIAVASHI, Hamid Reza TALESH BAHRAMI, Ehsan AMINIAN, Hamid SAFFARI. Numerical analysis on forced convection enhancement in an annulus......
, HONG C P. Modified cellular automaton model for the prediction of dendritic growth with melt convection[J]. Physical Review E, 2004, 69(6): 061610. [12] 朱鸣芳, 戴 挺, 李成允, 洪俊杓. 对流作用下枝晶生长行为的数值模拟[J]. 中国科学E辑... Metals, 2007, 17(S1): s84-s89. [14] SUN D, ZHU M, PAN S, RAABE D. Lattice Boltzmann modeling of dendritic growth in a forced melt convection[J]. Acta Materialia, 2009, 57(6): 1755-1767. [15] YIN H......
diffusive convection in a high-rise welding hall with stratified ventilation system WANG Fengfeng1, 2, LIU Zhiqiang1, Christoph van Treeck2, WANG Hanqing1, 3, TANG Wenwu1, 3, KOU Guangxiao1, 3 (1... of a stratified ventilation (SV) system, such as the supply air flow rate, the air supply velocity and the height of jet nozzle diffusers, on the double diffusive convection within a high-rise welding hall......
phenomena were analyzed according to competition of convection damping effect and thermo-electromagnetic convection effect with the magnetic field. Key words: Al-Cu alloy; directional solidification; high magnetic field; interface stability; magneto-hydrodynamic effect; thermoelectro-magnetic convection 磁场能够影响晶体的生长过程,约束晶体的排列方向,有效地抑制导电流体中的热溶质对流,耦合热电效应形成热电磁对流[1],进而对凝固组织和性能产生影响.近年来,随着超低温技术和超导技术的进......
纵向磁场对Al-40%Cu过共晶合金定向凝固显微组织的影响沈裕1,任忠鸣2,李喜3,任维丽3(1.上海市上海大学上海市钢铁冶金重点实验室2.上海大学 上海市现代冶金与材料制备重点实验室3.上海大学 上海市现代冶金与材料制备重点实验室,上海 200072)摘 要:研究了纵向磁场对Al-40%Cu(质量分数)过共晶合金定向凝固显微组织的影响.结果表明,在温度梯度GL=42.6K/cm,生长速率R=2μm/s,施加弱磁场时,Al2Cu初生相由规则小平面状逐渐变得不规则,并趋向于非小平面方式生长,热电磁对流效应在不同尺......
National University, 1370 Sangyeok-dong Buk-gu, Daegu, Korea)Abstract:The thermal-environment characteristics of the existing forced-convection cooling system were compared with those of the convective cooling system, which combined the radiant-floor cooling system using floor-heating panel typically applied to apartments in South Korea with the forced-convection cooling system using improved fan coil......
度本身是影响反应器反应类型的重要因素. 关键词: 颗粒动力学; 微元体动力学; 化学反应; 对流; 扩散; 解析解 中图分类号: TF01 文献标识码: A An analytical solution for coupled convection-diffusion and chemical reaction in fixed-beds XU Zeng-he1, ZHAI... multiple particles, so that the more exact chemical reaction term can be deduced. Then one-dimensional model for instable convection, chemical reaction and diffusion in fixed bed is proposed and solved......
Microstructural evolution during semisolid state strain induced melt activation process of aluminum 7075 alloy A. BOLOURI1, M. SHAHMIRI2, E. N. H. CHESHMEH2 1. Department of Mechanical...; accepted 25 June 2010 Abstract: The effects of compression ratio on the microstructure evolution of semisolid 7075 Al alloy produced by the strain induced melt activation (SIMA) process were investigated......
than 5 min, and the heat transfer in the evaporating adsorbate process called pool boiling belongs to the natural convection. And the performance of the heat transfer is very poor, with the maximum of coefficient of heat transfer 403.4 W/(m2·K). Key words: adsorption refrigeration; adsorber; plate fin tube; coefficient of heat transfer; natural convection 随着工业的发展和生活质量的提高,能源问题越来越被各个国家所重视,能源短缺就是其中重......