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论文作者:英语论文网论文属性:学术文章 Scholarship Essay登出时间:2013-08-19编辑:zbzbz点击率:7264
论文字数:945论文编号:org201308172049484165语种:英语 English地区:英国价格:免费论文
摘要:搅拌槽的混合数值模拟是近年来关注的热点,相关论文也比较多,本文是众多论文中的优秀论文,留学生朋友可以通过阅读论文掌握该类论文的写作技巧。
In order to predict the turbulent quantities at small scales pre-cisely, large eddy simulation (LES) or direct numerical simulation (DNS) is needed. In the last few years, LES studies on the mixing process have been successfully carried out. Yeoh et al.[14] per-formed LES study to characterize the mixing of an inert scalar in a baffled stirred tank agitated with a Rushton turbine. It was found that LES can provide a very detailed picture of the spatial and tem-poral evolution of the scalar concentration that cannot be obtained with the standard RANS approach. The predicted mixing time com-pared well, on average within 18%, with values determined from correlations reported in the literature. Hartmann et al.[15] per-formed a lattice-Boltzmann based LES study of the flow in a baffled Rushton turbine stirred tank at Reynolds number Re= 24,000. The mixing time was found to be significantly influenced by the impel-ler size but, has little effect with the position of the tracer injection point. The simulated mixing times overestimate the experimen-tally determined values but the discrepancies are no more than 30%. Min and Gao [16] and Zadghaffari et al. [17] employed the combination of SM and LES technique to study the mixing process in a baffled stirred tank agitated with a 3-narrow blade hydrofoil CBY impeller and a Rushton turbine, respectively. They all con-cluded that LES is a reliable tool to investigate the unsteady behav-ior of the turbulent flow in stirred tanks.
References
[1] Nere NK, Patwardhan AW, Joshi JB. Liquid-phase mixing in stirred vessels: turbulent flow regime. Ind Eng Chem Res 2003;42(12):2661–98.本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。