Numerical simulation of flow field in chemical vapor reactor for nanoparticle synthesized

This paper provided a numerical simulation of fluid dynamics in the chemical vapor reactor for nanoparticle synthesis. Standard k-? turbulence equation and eddy-dissipation model with standard wall function were used to investigate the reaction process of turbulent diffusion for alumina production. Here the tempera?ture and the operating conditions are discussed. Numerical results show that the model can well describe synthesis of nanometer alumina. The chemical reactions for alumina by this reactor are mainly concentrated in the range of 200 mm after the nozzle. The materials are completely mixed after 400 mm in the reactor.

Download Full-text

Computational Fluid Dynamics Simulation about Comparison of Different Forms of Return Air in a Small Cold Store

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.1133 ◽

2012 ◽

Vol 516-517 ◽

pp. 1133-1138 ◽

Cited By ~ 1

Author(s):

Yi Tang ◽

Jing Xie ◽

Jin Feng Wang ◽

Chen Miao ◽

Yi Zheng

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Computational Fluid Dynamics ◽

Flow Field ◽

Finite Volume Methods ◽

Dynamics Simulation ◽

Wall Function ◽

Computational Fluid Dynamics Simulation ◽

Cold Store ◽

Simulation Results

The quantity of the cold store in our country has been rapidly rising since the 1990s, however, the flow field in the cold store is difficult to obtain accurately by experiments. With reference to the experiences in previous numerical simulations in this paper, CFD is used for analyzing two forms of return air in the cold store with the Finite Volume Methods and the SIMPLE Revised. As a result, Combining with the non-equilibrium wall function, it is found that taking the way of return air on both sides of the fan is more reasonable and the cooling consumption of the empty cold store can be saved before the products enter the cold store. Furthermore, the numerical simulation results can provide reference for choosing fans in the small cold store.

Download Full-text

Investigation of the velocity field downstream of a benchmark vent using numerical simulation and hot-wire anemometry

EPJ Web of Conferences ◽

10.1051/epjconf/201921302076 ◽

2019 ◽

Vol 213 ◽

pp. 02076

Author(s):

Jan Sip ◽

Frantisek Lizal ◽

Jakub Elcner ◽

Jan Pokorny ◽

Miroslav Jicha

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Velocity Field ◽

Flow Field ◽

Large Eddy Simulation ◽

Turbulence Models ◽

Hot Wire ◽

Eddy Simulation ◽

Large Eddy ◽

Precise Prediction

The velocity field in the area behind the automotive vent was measured by hot-wire anenemometry in detail and intensity of turbulence was calculated. Numerical simulation of the same flow field was performed using Computational fluid dynamics in commecial software STAR-CCM+. Several turbulence models were tested and compared with Large Eddy Simulation. The influence of turbulence model on the results of air flow from the vent was investigated. The comparison of simulations and experimental results showed that most precise prediction of flow field was provided by Spalart-Allmaras model. Large eddy simulation did not provide results in quality that would compensate for the increased computing cost.

Download Full-text

Research Progress of Simulation on the Flow Field in Anaerobic Reactor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.955-959.2098 ◽

2014 ◽

Vol 955-959 ◽

pp. 2098-2101

Author(s):

Qin Zhang ◽

Qiang Li ◽

Jia Tang

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Computational Fluid Dynamics ◽

Wastewater Treatment ◽

Flow Field ◽

Treatment Effect ◽

Dynamics Simulation ◽

Research Progress ◽

Computational Fluid Dynamics Simulation ◽

Anaerobic Reactor

The flow field in anaerobic reactor is very complex, but it has been given wide attention because of its important impact to wastewater treatment effect. It is often studied by numerical simulation. The paper explored the research progress of simulation on the flow field in anaerobic reactor by the summary of development of anaerobic reactor and principle and characteristics of computational fluid dynamics simulation and introduction of study and application status on numerical simulation. And then it gave its opinion on the development of simulation on the flow field in anaerobic reactor in future.

Download Full-text

Computational fluid dynamics analysis of the influence of injection nozzle lateral outflow on the performance of Ranque-Hilsch vortex tube

Thermal Science ◽

10.2298/tsci120704002p ◽

2014 ◽

Vol 18 (4) ◽

pp. 1191-1201 ◽

Cited By ~ 1

Author(s):

Nader Pourmahmoud ◽

Alireza Izadi ◽

Amir Hassanzadeh ◽

Ashkan Jahangiramini

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Flow Field ◽

Vortex Tube ◽

Operating Conditions ◽

Energy Separation ◽

Physical Parameters ◽

Dynamics Analysis ◽

Computational Domain ◽

Computational Fluid Dynamics Analysis

In this article computational fluid dynamics analysis of a three-dimensional compressible and turbulent flow has been carried out through a vortex tube. The standard k-? turbulence model is utilized in order to simulate an axisymmetric computational domain. The numerical simulation has focused on the energy separation and flow field patterns of a somewhat nonconventional vortex tube, which is on the basis of creating an external hole at the end of each nozzle. According to the selected nozzles geometry, some of unfavorable phenomena such as shock wave, high pressure regions and appearing of unsymmetrical rotating flow patterns in the vortex chamber would be recovered significantly. In this way the physical parameters of flow field are derived under different both inlet mass flow rates and outlet pressures of nozzles hole (OPH). The results show that increasing OPH value enhanced the cooling capacity of machine in the most of operating conditions.

Download Full-text

Numerical Simulation of Flow Field of Inflation Pressure for Large Complex Sulfide Mineral of Low-Tin Flotation Machine

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.341-342.333 ◽

2013 ◽

Vol 341-342 ◽

pp. 333-336

Author(s):

Ming Zhen Hu ◽

Bo Zeng Wu ◽

Jin Quan Chen ◽

Ji Shu Zeng

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Flow Field ◽

Sulfide Mineral ◽

Inflation Pressure ◽

Flotation Machine ◽

Complex Sulfide ◽

Flow Field Characteristics ◽

Machine Simulation ◽

Simulation Results

For flotation characteristics of complex sulfide mineral of low-tin in Guangxi Dachang mine, fluid dynamics software FLUENT was applied to simulate the turbulence intensity of slurry fluid in flotation machine at different inflation pressures. The effect of flow field characteristics was gotten for flotation machine. Simulation results show that the best inflation pressure was 120000 Pa.

Download Full-text

Numerical Simulation of the Flow Field in Safety Valve

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.1432 ◽

2012 ◽

Vol 472-475 ◽

pp. 1432-1436

Author(s):

Xiao Bin Ji ◽

Xue Yi Qi ◽

Xiao Yan Li ◽

Wan Bin Jin

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Computational Fluid Dynamics ◽

Reynolds Number ◽

Flow Field ◽

Field Distribution ◽

Safety Valve ◽

Structural Parameters ◽

Flow Noise ◽

Simulating Calculation

By using the Reynolds stress turbulence model at big Reynolds number condition and computational fluid dynamics, the data simulating calculation was carried out to the safety valve inner flow field with different opening size and different valve structural parameters. The result were showed in visual graphics , and the study showed that the valve structural parameters impact on the flow field distribution , the cavitation creation and the flow noise greatly.

Download Full-text

Analysis of Flow Field on Hydraulic Unit of the Water Injection Pump by 3-D Numerical Simulation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.34-35.1713 ◽

2010 ◽

Vol 34-35 ◽

pp. 1713-1717

Author(s):

Hua Tong ◽

Xiao Hua Zhu ◽

Fu Cheng Deng ◽

Shao Hu Liu

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Flow Field ◽

Water Injection ◽

Flow Section ◽

Eccentric Load ◽

Hydraulic Unit ◽

Injection Pump ◽

Section Surface ◽

Improvement Method

In order to clarify the abnormal failure mechanism for the spring of the water injection pump, the velocity and the pressure are simulated for hydraulic unit in different driven angle. The eccentric load is found in the ansys, which is the main factor for leading to the exceptional failure of the spring. The improvement method is presented by using Computational Fluid Dynamics (CFD) technology. Flow field of the improved hydraulic unit is more uniform after the numerical simulation. The effect of eccentric load is greatly reduced for the suction spring. At the same time without changing the rate of flow, section surface of the suction valve and the discharge valve is appropriately reduced to bring down the load of the spring. The fluid dynamics analysis and optimization of the hydraulic unit has been completed in this paper. This study has great significance in perfecting the working theory of the water injection pump and raising the robustness of the pump’s motion.

Download Full-text

Numerical investigations on effect of wear-ring clearance on performance of a submersible well pump

Advances in Mechanical Engineering ◽

10.1177/1687814017704155 ◽

2017 ◽

Vol 9 (7) ◽

pp. 168781401770415 ◽

Cited By ~ 3

Author(s):

Weidong Shi ◽

Xiongfa Gao ◽

Qihua Zhang ◽

Desheng Zhang ◽

Daoxing Ye

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Computational Fluid Dynamics ◽

Flow Field ◽

Reverse Flow ◽

Internal Flow ◽

Experimental Results ◽

Ring Size ◽

Numerical Investigations ◽

Calculation Results

A typical submersible well pump was investigated in this article. The whole flow field of submersible well pump was numerically simulated by computational fluid dynamics software. The influence of clearance of wear-rings on the external characteristic and internal flow field was analyzed through comparing the calculation results with experimental results. The result of the numerical simulation shows that changing clearance of front wear-ring has a greater impact on pump performances than changing clearance of back wear-ring, and the head and efficiency of pump decrease with the increase in the size of clearance. Especially when the size of clearance is larger than 0.5 mm, decreasing becomes more obvious. When the front and back wear-ring size of the clearance comes to 1.0 mm, the efficiency decreases from the highest point of 75.31% to 65.44% at rated flow, and the head of pump decreases about 3.5 m. When the size of clearance is 0.2 mm, reverse-flow will appear in the front shroud cavity of the impeller, and leakage from back wear-ring through the balance hole into the impeller, which has a little influence on the flow field of the impeller inlet.

Download Full-text

Numerical Simulation of the Inner Flow Field and the Optimal Design of Hema-Type ATY Nozzle Based on Fluent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.3774 ◽

2013 ◽

Vol 634-638 ◽

pp. 3774-3777

Author(s):

Min Hua Zhang ◽

Hong Mei Zheng ◽

Cui Liu ◽

Yin Hu Qu ◽

Tao Liang ◽

...

Keyword(s):

Fluid Dynamics ◽

Numerical Simulation ◽

Computational Fluid Dynamics ◽

Optimal Design ◽

Flow Field ◽

Flow Fields ◽

Fluent Software ◽

Simulation Results

the inner flow fields of twelve Hema-type ATY nozzles which have different structure and parameters are simulated by the Fluent software, which is based on the CFD (Computational Fluid Dynamics) theory.Then the simulation results are analyzed，through wich the best designed nozzle is determined.

Download Full-text