scholarly journals Flow Characteristics Analysis of the Decontamination Device with Mixing and Diffusion Using Radio-Isotopes Tracer

2017 ◽  
Vol 39 (5) ◽  
pp. 282-287 ◽  
Author(s):  
Daemin Oh ◽  
Sungwon Kang ◽  
Youngsug Kim ◽  
Sunghee Jung ◽  
Jinho Moon ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Characteristics Analysis ◽  
And Diffusion ◽  
Radio Isotopes

The Flow Characteristics Analysis of Transonic around Delta-Wing to Separate Water from Natural Gas

2012 ◽  
Vol 462 ◽  
pp. 26-32
Author(s):  
Jun Qi Wang ◽  
Yang Yang Zhang
Keyword(s):  
Natural Gas ◽  
Gas Flow ◽  
Delta Wing ◽  
Temperature Drop ◽  
Flow Characteristics ◽  
Attack Angle ◽  
Water Separation ◽  
Process Gas ◽  
Characteristics Analysis ◽  
Expansion Angle

The changes in flow channel area and convergence-expanding nozzle help to flow rate of natural gas to the sound speed, also increase diameter to accelerate flow velocity and finally reach transonic flow condition. At this point, the temperature drop makes saturated water in natural gas condenses into droplets, generates swirl around the delta-wing, realize gas-water separation. This paper concentrates on Flent6.1 software process gas flow around a delta wing simulation, explains expansion angle and attack angle of delta-wing, determines a reasonable delta-wing attack angle is 10°, pipeline expansion angle is 0.29°, and obtains velocity vector, mach number, total pressure, static temperature and other flow field details of the attack angle and expansion angle, which lay foundation for production and application of the technology.

scholarly journals Modeling of human breath: conceptual and mathematical statements

2016 ◽  
Vol 11 (1) ◽  
pp. 64-80 ◽  
Author(s):  
П.В. Трусов ◽  
P.V. Trusov
Keyword(s):  
Mathematical Model ◽  
Flow Characteristics ◽  
Quiet Breathing ◽  
Ansys Fluent ◽  
Proposed Model ◽  
Joint Problem ◽  
Large Airways ◽  
Further Development ◽  
And Diffusion ◽  
Joint Problem Solving

The article is devoted to the main aspects of the development of a mathematical model of the human respiratory system taking into account the effects of environmental factors. The proposed model is a submodel of "meso-level" multilayered mathematical model of the evolution of functional disorders of the human body. The conceptual and mathematical formulations of the problem are discussed. The breathing is considered as a set of synchronized processes of gas dynamics, deformation of the porous medium and diffusion. The results of the calculation of the air flow characteristics during quiet breathing and forced breath in the first four generations of large airways were obtained by using software ANSYS Fluent. Further development of the model involves the joint problem solving of changes in lung configuration and in gasdynamic processes in the human airway.

scholarly journals Flow characteristics analysis of a two-phase suspension between rotating porous cylinders with radial and axial flows

2018 ◽  
Vol 22 (4) ◽  
pp. 1857-1864
Author(s):  
Yu-Chuan Zhu ◽  
Qing-He Xiao ◽  
Ming-Xin Gao ◽  
Qian Liu ◽  
Zhanhong Wan
Keyword(s):  
Reynolds Number ◽  
Stability Analysis ◽  
Radial Flow ◽  
Outer Cylinder ◽  
Flow Characteristics ◽  
Axial Flow ◽  
Taylor Number ◽  
Two Phase ◽  
Characteristics Analysis ◽  
Correlation Parameters

The flow characteristics problem of the two-phase suspension in the design of filters is presented, and the hydrodynamic stability is carried out to study the flow characteristics of a two-phase suspension between a rotating porous inner cylinder and a concentric, stationary, porous outer cylinder when radial flow and axial flow are present. Linear stability analysis results in an eigenvalue problem that is solved numerically by Wan?s method. The results reveal that the critical Taylor number for the onset of instability is altered by other parameters. For given correlation parameters, increasing the axial Reynolds number increases the critical Taylor number for transition very slightly, the critical Taylor number decreases as the axial Reynolds number becomes negative.

Hydrodynamic and Noise Characteristics Analysis of a Sea Valve and its Optimization

2013 ◽  
Vol 432 ◽  
pp. 330-335
Author(s):  
Hui Jin ◽  
Xiang Zhu ◽  
Bo Wen Deng ◽  
Guan Jun Zhang ◽  
Jun Hu
Keyword(s):  
Flow Field ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Sound Level ◽  
Acoustic Performance ◽  
Noise Characteristics ◽  
Valve Structure ◽  
Characteristics Analysis ◽  
Critical Unit ◽  
Reduction Characteristics

The sea valve is a critical unit in the seawater pipelines onboard. Its mainly used to control and adjust the flux of seawater. In the practical use, the vibration and sound level of a kind of valve is proved to be too high to maintain the acoustic performance of ships.In this paper, the three-dimensional geometry and CFD model of a typical sea valve is established.Then the flow fields inside the valve, flow characteristics, drag reduction characteristics and noise characteristics were analyzed, as well as the fluid-solid coupling response between the flow field and the valve structure. Based on the analysis, two optimum schemes are proposed in order to improve the flow characteristics of the flow field and reduce vibration and noise level of this type of sea valves. The calculated results show that two optimum schemes both can improve the hydrodynamic and noise characteristics, and the scheme two is relatively better.

Aerodynamic performance and flow characteristics analysis of Tesla turbines with different nozzle and outlet geometries

2018 ◽  
Vol 233 (3) ◽  
pp. 358-378 ◽  
Author(s):  
Wenjiao Qi ◽  
Qinghua Deng ◽  
Yu Jiang ◽  
Zhenping Feng ◽  
Qi Yuan
Keyword(s):  
Flow Characteristics ◽  
Aerodynamic Performance ◽  
Flow Coefficient ◽  
Working Fluid ◽  
Rotating Disc ◽  
Characteristics Analysis ◽  
One To One ◽  
Nozzle Geometries ◽  
The One ◽  
Isentropic Efficiency

The aerodynamic performance and flow characteristics of a multichannel nozzled Tesla turbine were investigated numerically with different nozzle and outlet geometries at different rotational speeds. Two kinds of nozzle geometries were proposed: one nozzle channel to one disc channel (named as one-to-one turbine) and one nozzle channel to several disc channels (named as one-to-many turbine). Simplified radial outlet and real axial outlet geometries of the Tesla turbines were adopted to research the influence of outlet geometries. The results show that compared with the one-to-many turbine, the isentropic efficiency of the one-to-one turbine is much higher; while the flow coefficient is much lower. In addition, in the middle disc channels (DC1 and DC2) of which two walls are rotating disc walls, the flow fields are almost the same, but different from that in the side channel (DC3) of which one wall is a rotating wall and the other one is a stationary casing wall. DC1 and DC2 generate more torque with less working fluid, thus the disc spacing distance of DC3 should be narrower than that of DC1 and DC2. Compared to the one-to-many turbine, the working fluid flowing through DC1 and DC2 of the one-to-one turbine is much less, and the flow path lines are much longer. The results of different turbine outlet geometries show that compared with the turbines with radial outlet, the isentropic efficiency of the one-to-many turbine with axial outlet is a little higher, while that of the one-to-one turbine with axial outlet is lower. This is due to the larger torque on the disc hole walls, despite a lot more total pressure loss in the exhaust vent of the one-to-many turbine. Therefore, the contribution of disc hole walls to torque cannot be neglected in numerical simulations.

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