%0 Journal Article
%T Simulations of Plug Conveying in a Vertical Pipe<br>垂直管道中塞状流的模拟
%A YU Ai-bing
%A <br>欧阳洁
%A 孙国刚
%A YU Ai-bing
%J 过程工程学报
%D 2003
%I 
%X The phenomena of plug conveying in a vertical pipe have been simulated by using the simplified hard-sphere model. In the model, the behavior of solid phase is simulated by calculating the motion of individual particles while gas flow is obtained by solving the locally averaged equation, taking account of the interaction between fluid and particles. For the calculation of solid phase, the motion process of each particle is decomposed into the collision process accounting for the inter-particle interaction and the suspension process related to the interaction with fluid. Momentum conservation of collision mechanics controls the interaction between colliding particles, while the state of each suspended particle is fully dominated by the equation of force balance over that particle. The coupling relation between two phases is subjected to the Newton's third law of motion, in which the action of fluid to individual particle will react on the fluid phase from the individual particle in a computational cell. As a result, the proposed model has shown the typical behavior of vertical plug. In simulations, the particles are observed to move up as "plug" of bulk solids that occupy the entire cross-section of pipe. There are almost no particles between two plugs. Although some particles go out from the back of the plug and come in front of the plug, the length of the plug fluctuates around a certain fixed value for a certain set of operating condition. At the same time, the plug moves has almost uniform velocity and similar pattern in different cross sections. The plug velocity is independent of the plug length and it increases with increasing gas velocity. These results are qualitatively coincident with experiments. Compared with the soft-sphere model, the simplified hard-sphere model based on the method of resolving particle's motion process is simple and takes less time without special attention to be paid in calculations.
%K simulation
%K hard-sphere model
%K plug conveying
%K gassolid two-phase flow<br>垂直管道
%K 塞状流
%K 硬球模型
%K 气固两相流
%K 流态化
%K 数值模拟
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=3FCF8B1A330466D5&jid=B9EE12934D19905403D996AE65CEEEED&aid=CBC8A2B8C8B6ECC8&yid=D43C4A19B2EE3C0A&vid=38B194292C032A66&iid=38B194292C032A66&sid=23104246A5FCFCEF&eid=FCD27DC5E1F2EEE7&journal_id=1009-606X&journal_name=过程工程学报&referenced_num=0&reference_num=22