AVERAGED EQUATIONS FOR INVISCID DISPERSE 2-PHASE FLOW

被引:196
作者
ZHANG, DZ
PROSPERETTI, A
机构
[1] Department of Mechanical Engineering, The Johns Hopkins University, MD 21218, Baltimore
关键词
D O I
10.1017/S0022112094001151
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Averaged equations governing the motion of equal rigid spheres suspended in a potential flow are derived from the equation for the probability distribution. A distinctive feature of this work is the derivation of the disperse-phase momentum equation by averaging the particle equation of motion directly, rather than the microscopic equation for the particle material. This approach is more flexible than the usual one and leads to a simpler and more fundamental description of the particle phase. The model is closed in a systematic way (i.e. with no ad hoc assumptions) in the dilute limit and in the linear limit. One of the closure quantities is related to the difference between the gradient of the average pressure and the average pressure gradient, a well-known problem in the widely used two-fluid engineering models. The present result for this quantity leads to the introduction of a modified added mass coefficient (related to Wallis's 'exertia') that remains very nearly constant with changes in the volume fraction and densities of the phases. Statistics of this coefficient are provided and exhibit a rather strong variability of up to 20 % among different numerical simulations. A detailed comparison of the present results with those of other investigators is given in sectional sign 10. As a further illustration of the flexibility of the techniques developed in the paper, in Appendix C they are applied to the calculation of the so-called 'particle stress' tensor. This derivation is considerably simpler than others available in the literature.
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页码:185 / 219
页数:35
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