Incompressible Model of Solids Conveying in a Single-Screw Extruder

Incompressible Model of Solids Conveying in a Single-Screw Extruder
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单螺杆挤出机中固体输送的不可压缩模型

DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Valentinas Sernas
Valentinas Sernas
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文献类型：
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作者：
Shibo Zhang;Valentinas Sernas

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玉米粉挤压试验[Zhang，S. Sernas，V.（1998）. 1998年ASME国际机械工程师大会和博览会，阿纳海姆，CA，HTD-C. 361-1。pp. 309-315]已经表明固体在单螺杆挤出机的螺杆通道中的流动具有螺旋图案。这一观察结果意味着在挤出机的固体输送区中存在横向通道速度分量。现有的固体输送模型[Broyer，E. Tadmor，Z.（1972年）。Polym.工程科学，12（1）：12-24;坎贝尔，G.A.和Dontula，N.（1995年）。国际聚合物工艺X。汉萨出版社。pp. 30-35; Darnell，W.H.和Mol，E.A.（1956年）。Soc. Plast.工程师J.，12（4），20-29; Hyun，K.S.和Spalding，M.A.（1997年）。ANTEC '97 Proc.163：211-218]将在通道中移动的固体处理为没有跨通道速度分量的活塞流。本文提出的二维粉体输送模型包含了下通道分量和横通道分量。粉末流中的应力产生机制比流体流中的应力产生机制复杂得多。不可压缩模型采用了本构方程的粉末流与滑移边界条件。模型中还包括能量方程和适当的边界条件。数值计算结果表明，所预测的下游通道压力发展、速度和温度分布是合理的。
Experiments in corn meal extrusion [Zhang, S. and Sernas, V. (1998). Proc. 1998 ASME Int ME. Congress and Exposition, Anaheim, CA, HTD-Vol. 361-1. pp. 309-315] have shown that the flow of solids in the screw channel of a single-screw extruder has a helical pattern. This observation implies that there is a cross-channel velocity component in the solids conveying zone of the extruder. Existing solids conveying models [Broyer, E. and Tadmor, Z. (1972). Polym. Eng. Sci., 12(1): 12-24; Campbell, G.A. and Dontula, N. (1995). International Polymer Process X. Hanser Publishing. pp. 30-35; Darnell, W.H. and Mol, E.A. (1956). Soc. Plast. Eng. J., 12(4), 20-29; Hyun, K.S. and Spalding, M.A. (1997). ANTEC ’97 Proc. 163: 211-218] treat the solids moving in the channel as a plug flow without a cross-channel velocity component. The two-dimensional powder conveying model proposed in this paper contains both a down-channel component and a cross-channel component. The stress generating mechanism is much more complicated in a powder flow than in a fluid flow. The incompressible model incorporates a constitutive equation for the powder flow with slip boundary conditions. The energy equation with appropriate boundary conditions is also included in the model. The numerically solved model shows that the predicted down-channel pressure development, velocity and temperature distributions are all reasonable.