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| 1 | LBE simulation of impinging stream inside a T-junction mixer显示文摘Lattice Boltzmann Equation(LBE) method is utilized to simulate impinging stream(IS) in a T-junction mixer using a TD2G9 model. It aims to investigate the influence of Reynolds number(Re), aspect ratio of outlet diameter to inlet diameter, ratio of opposite inlet velocities, and the thermal boundary conditions on flow, mixing and heat transfer characteristics. In particular, the vortex evolution, velocity distribution, mixing index and Nusselt number(Nu) distribution in the T-junction mixer are explored in details. Four types of vortices and flow regimes are observed. The instantaneous and time-averaged flow and thermal fields,including vortex structure, transition of flow regimes, streamline and the Nusselt number distribution are discussed. Distinct quantitative transitions, even for dramatic change, are observed near the critical Re. At a low or moderate aspect ratio, the symmetric coherent structure is observed in an unstable flow regime. At a larger aspect ratio, the flow in the T-mixer becomes turbulent and asymmetric. The unequal injections velocities of the nozzles impose significant influence on the flow structure,mixing and heat transfer in vertical tube. Using larger difference between the two inlet velocities can result in more obvious change in flow characteristics. Moreover, mixing index is found to be valid in evaluating the mixing degree under a sinusoidal inlet velocity. | XU WenKai ZHANG QingChen GUI Nan ZHANG ZiWei | 2018 | Science China(Technological Sciences)2018，61，7： | 0 |
| 2 | 二维非等温撞击流流场和温度场结构的格子Boltzmann研究显示文摘为了加深对非等温撞击流的认识,并为撞击流的实际应用提供理论支持,本工作采用格子Boltzmann方法(LBM)中的热格子模型(TD2G9)对二维非等温撞击流进行了数值模拟,并对撞击流流场和温度场的结构进行了讨论与分析。以往对于撞击流的研究大都固定其他参数,讨论单个参数对流场和温度场结构影响的规律,而忽略了其他参数变化时这个规律的变化。基于此本工作研究了三个参数,喷嘴间距与喷嘴宽度比(H/W)、雷诺数(Re)和热浮力(RiT)共同作用对撞击流的流场和温度场结构的影响。研究方法如下:从三个参数里取出两个参数A和B固定不变,变化另外一个参数C,研究参数C变化时流场和温度场结构变化的规律,记为D1;然后变化A和B中的一个,观察C变化时流场和温度场结构变化的规律,记为D2,最后比较D1和D2的区别。分析发现瞬时场的周期性偏斜振荡仅在无浮力下产生,稳态的偏斜和平均场的偏斜仅在有浮力下产生;并且定性研究发现,较大的H/W值和较大的RiT值是出现稳态偏斜结构的必要条件,而Re较大并不是其必要条件。在以往对撞击流的研究中有的学者发现撞击流的瞬时场会出现周期性的偏斜振荡,有的学者发现撞击流会出现稳态的偏斜结构,本文明确了出现这两种偏斜结构的参数条件。 | 李宇洁 张文欢 汪一航 | 2019 | 计算机与应用化学2019，36，5： | 0 |
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