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Numerical simulation of flow field inside abrasive water jet nozzle on steady, turbulence, two-phase flow conditions was carried out based on FLUENT. The main geometric parameters of abrasive water jet nozzle were analyzed. The results show that the smaller the contraction angle a of the focusing tube, the better flow field inside abrasive water jet nozzle is. Also smaller contraction angle avoids...
The three-dimensional turbulent flow in a supercritical pump with complex double-cases based on the integral model combined with the pass-by pipes is computed and simulated by means of a parallel computer and the software FLUENT using the mathematical models (Navier-Stokes equations, RNG k-ε turbulence model and boundary conditions) in Computational Fluid Dynamics (CFD), which aims at improving the...
The high-pressure vortex tube is one of key equipment in the skid-mounted package liquefied CBM. The high pressure gas strong rotating flow in vortex tube is the key issues of energy separation. There are many problems that the current experimental methods for the strong high-pressure in three-dimensional rotating turbulent flow and heat transfer measurements. The flow field and temperature field...
Flow held numerical simulation of underwater torpedo launching was performed using the commercially available CFD software FLUENT based on the Reynolds averaged Navier Stokes equations and k-epsilon turbulence model. The computational domain includes flow field in launch tube and front of the submarine head. Axisymmetric model was used in the simulation and torpedo appendages such as fins, rudders...
A study of multi-scales characteristics of tube pressure time series signals in a Kenics static mixer was undertaken using turbulent higher order items and the power spectrum function based on wavelet transform. By applying the method of direct determination of the flatness, the amplitudes of flatness at different scales for turbulent flow have stronger fluctuation and mainly fluctuate between 2.3...
To improve the efficiency of direct air-cooled condenser and optimize the physical structure of the flat tube fin, the 3D physics-mathematics models are set up and a CFD (Computational Fluid Dynamics) solver is employed to perform the numerical simulation. The flat wave-fin tube and the flat vertical-fin tube are calculated separately. In six wind conditions, the heat transfer coefficients, flow losses,...
The simulation method of CFD was used to investigate the gas pressure and velocity 3D field of tower continuous vacuum dryer. The standard turbulence model was adopted. Material zone was set as porous medium zone. Darcy law, Ergun equation and porous medium interface jump boundary condition was applied. The result shows that the pressure of vacuum outlet should lower the pressure of material inlet...
The knowledge of forced flow heat transfer of liquid nitrogen and liquid hydrogen is important for cooling design of large scale HTS superconducting magnets wound with YBCO, BSCCO or MgB2 conductor adopting indirect cooling or inner conductor cooling, such as CICC configuration. As a first step of the study, forced flow heat transfer of liquid nitrogen in a horizontal tube was analyzed in this work...
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