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The objective of this study is to predict the pressure gradient for gas-liquid bubbly flow along a vertical pipeline by using a Computational Fluid Dynamics (CFD) numerical simulation. The CFD simulation is compared with experimental data obtained from the literature, which involves a vertical pipe with a length of 1.52 m and an inner diameter of 11.68 mm. Empirical correlations available in the literature...
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...
The airflow field has decisive effect on how to manage the system to be in good performance. Moreover, it is significant for energy saving and environmental protection. The three dimensional air-flow fields in the V-type heat exchanger was studied by computational fluid dynamics(CFD). In the model, the fin-tube heat exchanger was looked at a porous medium. Numerical results were testified by the experimental...
The thermodynamics of the exhaust gas recirculation (EGR) cooler is very important for reducing oxides of nitrogen (NOx) emission of diesel engines. Using the CFDesign software, some 3-D fluid thermodynamic models of EGR coolers are established by using the finite element method (FEM); and the temperature, velocity and pressure fields of fluids in the EGR coolers are simulated and verified by experiments...
The simulation model of hydraulic shockwave is established based on the analysis of the hydraulic oil flow in the pipe and the production mechanism of hydraulic shock. Simulation results by fluent software indicate that it is consistent with the experimental one. It notes the virtual result is trustworthy and numerical simulation of hydraulic shock waves is feasible using dynamic grid in CFD software,...
The internal ring matrix distribution of many special ceramic porous medium tubes on a circular plate constitutes an adsorbent device, which can retain nanoparticles aerosol agglomerate by the way of collision, adsorption and diffusion in the process of mass transfer. In this paper, the behavior of industrial flue dust diffusion in the ceramic porous medium device is researched by computational fluid...
The flow behaviour inside the vortex tube is quite complex. The fundamental mechanism underlying the energy separation effect is still elusive due in part to a lack of satisfying understanding of flow field and temperature distributions inside the vortex tube. With the aim to disclose the essential mechanisms of energy separation in a vortex tube, it is significant to acquire the distributions of...
The paper presents a new type of oxygen-enriched burner that is applying for patent of China. It can be used in pulverized coal fired boilers of power plant and achieve the ignition technology of oxygen-enriched and oil-free. It uses oxygen-enriched gas transport pulverized coal and adopts heat exchange technology of counter flow and downstream in three casing pipes, which can increase the maximum...
The three-dimensional turbulent flow in a supercritical pump with complex double-cases based on the integral model combined with the pass-by pressure-balancing pipes is computed and simulated by means of a parallel computer and the software FLUENT using the mathematical models (Navier-Stokes equations, turbulence model and boundary conditions) in Computational Fluid Dynamics (CFD). The effects of...
Based on the maximal velocity distribution uniformity, the minimal velocity-weighed average bias angle of the outlet section and the minimal hydraulic loss of the suction chamber, three optimum object functions of suction chambers of pipeline pumps are established. According to uniform design, ten optimum schemes are determined with the height H3 and the length L as the optimum parameters, and internal...
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...
Tower vacuum dryer is new drying equipment. Its heating is by hot water through the diamond pipes. So the hot water's flowing has important effect on drying quality. Based on fluid dynamics equation, k-epsiv model, the flowing characteristics in heating pipes was analyzed. The model is implemented and solved with three-dimensions by finite element method (FEM) using the software Gambit and Fluent...
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