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Flow Turbulence Model

. ') To calculate the instantaneous performance. Then the fluid phase of the transient performance of random particle trajectory calculations. Comparison of fine particle group,[link widoczny dla zalogowanych], a large number of particles in order to track the statistical nature of the system average. Particle phase calculations,[link widoczny dla zalogowanych], using the Monte Carlo method. Several computing models described above, more general models are: the local uniform flow pattern, two-fluid model,[link widoczny dla zalogowanych], deterministic separated flow touch-type and random separated flow model, these models are considered the two phases of the transport rate and turbulence effect. 5.4 to take the top two-phase flow calculation model has the characteristics of a variety of computing models and conditions were analyzed. Following the pattern classification and the selection criteria listed in Table 3.6 some conclusions (1) According to the two-phase flow in the fluid phase and particle phase, the degree of interaction between different particles can be dispersed phase is divided into two types of particles and particle swarm . And each class is divided into role of the feed particles can be ignored and can not ignore the two. (11) and (17 can be used as the calculation formula of classification and discrimination. (2) the flow field after the addition of heterogeneous particle. Generally speaking turbulence intensity to change, but change the trend, not simply as \\) existing two-phase flow calculation model. broadly divided into two categories. the continuum model and the separated flow model, and each category there are several kinds of models. Each calculation model has its limitations, be in accordance with its using the conditions selected. Table 3 of reference 13 for calculation of Hydraulic and Electric Science and Technology Volume 21 No. 4 Table 3 Model selection criteria of local uniform flow model single particle mediated response time of less than the characteristic response time of the fluid phase,[link widoczny dla zalogowanych], two-phase Q faster than the transport of a mass flow rate of development and change as a whole is much faster. even the composition mode Continuous mode added tiny particles. were scattered granular, particles follow the good. sub-particles dispersed two-phase dilute particle model. particle phase does not meet the continuum of treatment conditions (type 11). separated from the capsule feeding flow model of qualitative particle response time than the characteristic time tangled arteries block long,[link widoczny dla zalogowanych], turbulent particle diffusion can be omitted. type stochastic separated flow model of turbulent fluctuation on the particle to be considered the diffusion of particles consistent with Taiwan continuum treatment conditions (type 11) or the size of each of the two-phase two-fluid model, the Department of System of a larger two-phase flow