On the basis of cold gas simulation, a numerical simulation of two-phase turbulent flow was performed employing an Eulerian-Eulerian approach and K- -A.

In chapter two,according to N-S equation,considering the couple between liquid and solid,the double-fluid model is used to respectively set up momentum equations of two-phase fluids in condition of basic hypothesis,which are general equations of two-phase fluids.

The pseudo-fluid model and the k-ε turbulent model were modified. Phase coupled SIMPLE algorithm was applied to form the pressure-velocity correction equation.

Numerical simulation of shooting sand process was conducted using two fluid model to describe the shooting sand process based on newly developed two phase flow theory.

Using two fluids model, the frictional pressure drops of oil gas water three phase flow in a horizonatal tube ( 45 mm) were studied experimentally and theoretically. For different flow regimes new calculation correlations were proposed.

Based on a one-fluid, two-temperature radiation hydrokinetics model, we study the interaction processes of XeCl laser radiation with a one-dimensional aluminium target.

We use a two-fluid approach in which the total pressure in the medium is the sum of the circumstellar gas pressure and the relativistic particle pressure.

In the present study we simulate numerically the solar wind flow in a coronal hole with the two-fluid approach.

Employing a two-fluid approach, each phase was considered a fluid that interpenetrates the other phase.

The two-fluid approach to solving this problem has yielded promising initial results, and appears to simulate correctly the basic physics of the flow.

First the two different definitions of pressure and thermal flux etc. in diffusion model and in two-fluid model are given. Then a physical interpretation of pressure and thermal flux is discussed by introducing the momentum flux vector M and the energy flax (?) through a surface dS in flow field. In describing the motion of mixture, it is suggested to use the qnaatities defined in diffusion model. In describing the motion of a component, it is suggested to use the quantities defined in two-fluid model. The collision...

First the two different definitions of pressure and thermal flux etc. in diffusion model and in two-fluid model are given. Then a physical interpretation of pressure and thermal flux is discussed by introducing the momentum flux vector M and the energy flax (?) through a surface dS in flow field. In describing the motion of mixture, it is suggested to use the qnaatities defined in diffusion model. In describing the motion of a component, it is suggested to use the quantities defined in two-fluid model. The collision pressure and the collision thermal flux in dense gas-mixture are also discussed in detail, i.e. their origin, their expressions in momentum equation and in energy equation, and the difference in physical character between them and the normal partial pressure and partial thermal flux.A gas-particle flow can be treated as a flow of dense gas-mixture. The long-standing con-trovesy whether the "inertial coupling term" should exist in the momentum equation can be clarified by the two different definitions of pressure.

One fluid model, diffusion model and two fluid model can be used to describe the motion of mixtures. By introducing these three models and comparing them with each other, it should be pointed out that the one fluid model has fewer motion equations and hence can be easilier solved, but there are less informations in the solution. The latter two models contain equal amount of information. Since the motion equations of the diffusion model can be deduced from that of the two fluid model by introducing some approximate...

One fluid model, diffusion model and two fluid model can be used to describe the motion of mixtures. By introducing these three models and comparing them with each other, it should be pointed out that the one fluid model has fewer motion equations and hence can be easilier solved, but there are less informations in the solution. The latter two models contain equal amount of information. Since the motion equations of the diffusion model can be deduced from that of the two fluid model by introducing some approximate assumptions, a certain error is involved in it while it can be easilier solved than the two fluid model. The relationship between the error and the physical properties of the moving media has been analysed and the application range of the diffusion model has been given in this paper. It has been explained why the one fluid model and the diffusion model are often used for mixed gas and the two fluid model is used for gas particle mixture. The property of liquid particle mixture lies between the two kinds of mixture above and the diffusion model is basically, but not completely suitable to it. In the diffusion model, the diffusion velocity is often expressed according to the well known Fick′s law. It should be pointed out that the application of the Fick′s law is conditional and the difficulties met in sediment mechanics nowdays are contacted with these limitations, hence it is necessary to introduce a more general expression of the diffusion velocity. \ \

According to the fundamental concept of two-fluids,the governing equations for description of gas-droplets turbulent combustion in an afterburner of jet engine have been formulated,in which the important injection effect of the droplets in afterburner has been taken into detailed consideration.The Farve average method has been employed to represent the effects of turbulent combustion in the afterburner.The multiple time scale turbulent k-ε model proposed by Kim is applied to calculating the eddy viscosity of...

According to the fundamental concept of two-fluids,the governing equations for description of gas-droplets turbulent combustion in an afterburner of jet engine have been formulated,in which the important injection effect of the droplets in afterburner has been taken into detailed consideration.The Farve average method has been employed to represent the effects of turbulent combustion in the afterburner.The multiple time scale turbulent k-ε model proposed by Kim is applied to calculating the eddy viscosity of the turbulenct field.The heat flux radiation model has been taken to consider the effect of radiation at high temperature,the simple one step chemical reaction model is used to approximate the combustion of kerosene.The chemical reaction rate is assumed to be controlled by eddy break up process,and the reaction rate is modified by premixed reaction model in Arrhenius form.The application of SIMPLE algorithm indicates that the present twofluid model can calculate the two-phase turbulent combustion in the jet engine afterburner and obtain reasonable results.