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According to obtain the mechanism of electrowetting-on-dielectric (EWOD), the instantaneous pressure difference inside a droplet was obtained by means of a numerical simulation method in this paper, which was the root reason for EWOD. First, based upon the theory of electrowetting-on-dielectric(EWOD), a geometrical model of EWOD was established in a commercial software using VOF method. Next, deriving...
A mathematical model for contaminant species passing through fractured porous media is presented. In the numerical model, we combine two locally conservative methods, i.e. mixed finite element (MFE) and the finite volume (FV) methods. Adaptive triangle mesh is used for effective treatment of the fractures. A hybrid MFE method is employed to provide an accurate approximation of velocities field for...
As a kind of high-efficient separation equipment, hydrocyclone has been widely used. In order to improve its performance, the structures of different parts have been optimized in recent years. Especially for the inlet structures, they play an important role in internal flow field and separation efficiency. So in this paper, two kinds of hydrocyclones with typical inlets - axial-flow hydrocyclone and...
The ventilation system is the basis to control the hazards in coal mine laneway. High reliability ventilation system can continuously convey fresh air into laneway , dilute the noxious gas, reduce disaster and ensure the mining productivity safe and effective. As we know that, many noxious gases in the coal mine laneway are compossible and their flowing states are complicated. In order to acquire...
The numerical simulation was carried out by building methane-diesel fuel model at the base of physical model and basic control equation of hydrodynamics, by adopting non-premix combustion method, by simplifying combustion as blends, and by calculating blend fraction. Furthermore, its combustion press field, temperature field and velocity field were analysed. Finally, the experimental results indicated...
The lack of knowledge about water flow and particle behavior of the grit chamber with rotational flow remains a significant difficulty for the design of these work in sandstone wastewater of hydropower station. In the paper, Eulerian-Lagrangian multi-phase model is set up. The grit chamber with rotational flow in the powerhouse, which is located in southwest of China, is as a case. Velocity field...
In this paper, a numerical two-phase flow model combining with the Realizable k-ε turbulent model for compressible viscous fluid is presented for the simulation the flow around a fixed-cone valve; and the equations are solved with the finite volume method. The free fluid surface is simulated by the VOF method. The function of the fixed-cone valve for energy dissipating is pointed out by analyzing...
The problem of a three dimensional free convection flow with mass transfer of an incompressible viscous electrically conducting fluid past a uniformly moving porous vertical plate with transverse sinusoidal suction velocity is considered. A magnetic field of uniform strength is assumed to be applied normal to the plate. The expressions for skin-friction at the plate in the direction of flow, rate...
Cold air distribution systems can potentially lower operating and first costs when compared to conventional air conditioning system. One concern for cold air distribution is that the cold supply air temperatures can be uncomfortable. Air distribution and comfort in a typical room with cold air diffusion was investigated by the method of CFD. A mathematics model was established and the air distribution...
Through dimensionless analysis on effect factors of spontaneous combustion in goaf, this paper establishes a coupling mathematical model including skeleton temperature field, air temperature field, velocity field and oxygen concentration field to reveal the characteristics of spontaneous combustion. A visual graphic program is also developed to calculate and simulate the oxygen concentration and speed...
This paper based on the flow field numerical simulation method to analyze the valves used for space instrumentation ,the flow field of high-pressure unloading valve was numerical simulation upon different structural parameters,thus it achieved the result of the pressure and velocity field. the effect of flow field and pressure velocity characteristic by the structural parameters was analyzed. The...
It is carried out a numerical study of the three-dimensional temperature and velocity fields in a cylindrical horizontal thermal tank during the process of water circulation. The numerical simulations were made using an academic Finite Volumes numerical code. This simulation considers that the thermal tank is connected to solar collectors. So, in the tank, the inlet jet temperature is higher than...
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