颗粒流体两相流结构极值行为的初步研究

EXTREMUM BEHAVIOR OF FLOW STRUCTURE IN PARTICLE-FLUID TWO-PHASE FLOW

1 前言气固两相流系统是不均匀的,其中存在颗粒浓度很高的密相聚团和颗粒浓度很低的稀相。李静海等提出的多尺度作用能量最小(EMMS)模型,把不均匀性归因于悬浮输送能耗N_(st)最小,并提出在颗粒流体协调工况(PFC)下稳定性条件为N_(st)=min,而在流体控制工况(FD)时的稳定性条件为N_(st)=max,并定义了两者的过渡。本文在以上研究的基础上,初步研究了两相流结构的极值行为,以获得对两相不均匀结构更深入的理解。

This study has been devoted to analyzing the extremum behavior of flow structure and energy consumption in particle-fluid two-phase flow on the basis of the so-called Energy-Minimized Multi-Scale (EMMS)model. It is indicated that all parameters related to flow structure and energy consumption are extremal (either maximal or minimal).