Three-Dimensional CFD Simulation of Fluid Flow inside a Vortex Tube on Basis of an Experimental Model- The Optimization of Vortex Chamber Radius

Rafiee, Seyed Ehsan; Mohammadkhani, Farzad

doi:10.18280/ijht.340212

Cited by 25 publications

(11 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At stage 2, pressure decreased, because the suction waves by sliding vane pumps have transmitted to the measured points, and the liquid inside started accelerated movement by pumping and pushing of air compressor. With the differential pressure of sliding pump far above the power by air compressor, the sliding vane pump played a leading role in liquid evacuation process and the pipe-bottom pressure decreases sharply [6] [7]. At stage 3, the pressure drop stopped.…”

Section: Flow Pattern Changing Rule In Liquid Evacuation Processmentioning

confidence: 99%

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Guo¹,

Zhang²,

Jiang³

et al. 2017

IJHT

View full text Add to dashboard Cite

The test studies the gas-liquid two-phase flow characteristics in pump-assisted evacuation process for hillyterrain pipeline system. In pump-assisted evacuation process, there appear two flow patterns: stratified flow and slug flow. By means of reducing upstream back pressure, the pump-assisted evacuation can increase the liquid flow rate, promoting the transition of flow pattern. For the pipe-bottom pressure change process, it increases firstly, then decreases, and slowly increases at last. During the process of pressure drop, there will appear temporary buffer section for the slug accumulation. The pressure fluctuation doesn't increase with inlet superficial gas velocity, and the max fluctuation range appears in the working condition with 0.88m/s superficial gas velocity. The outlet liquid flow rate corresponds to the pressure fluctuation. Four stages are divided for the variation process. The flow rate is less influenced by the inlet superficial gas velocity, but more influenced by the inclined angle. By using gas front-end velocity meter to check the evacuation efficiency, it is found that with inclined angle of upward inclined pipe (UIP) unchangeable, the higher the gas superficial velocity, the greater the gas front-end velocity, presenting an approximate linear relationship; with the gas superficial velocity unchangeable, the gas front-end velocity almost remains the same, even with the inclined angle of upward inclined pipe increasing.

show abstract

Section: Flow Pattern Changing Rule In Liquid Evacuation Processmentioning

confidence: 99%

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Guo¹,

Zhang²,

Jiang³

et al. 2017

IJHT

View full text Add to dashboard Cite

show abstract

“…where K is the turbulent kinetic energy; PK is the generation term of turbulent kinetic energy; PK=υtS 2 =2υtSijSji; uj(j=1, 2,3) is the velocity component of the coordinate axis xj; υ is the kinematic viscosity coefficient; υt is the eddy viscosity coefficient; ω is the specific dissipation rate; β*, σk, γ, β, σω, and σω2 are constants of the transport equation. The mixed functions: …”

Section: Sst K-ω Turbulence Modelmentioning

confidence: 99%

“…Despite the significant improvement on research efficiency by CDF, the calculation accuracy is still affected by the selection and application of the turbulence model [2].…”

Section: Introductionmentioning

confidence: 99%

Research on the effect of rotation and curvature on turbulence model and their application

Jiang¹,

Zhang²

2017

IJHT

View full text Add to dashboard Cite

This paper analyzes the advantages and defects of the k-ω SST turbulence model when adopted for simulation calculation under working conditions of rotational motion and curved walls. On the basis of this model and in consideration of the rotational motion and the curvature effect, the author introduces the correction equation proposed by Spalart on the basis of the steady-state rotation effect, and Hellsten's Richardson number correction model, recalculates the specific dissipation rate in the near-wall area by the EWT, and corrects the turbulent kinetic energy generation term in the turbulence model. The author applies the original and the improved turbulence models in the calculation of the lift and efficiency of the centrifugal pump and finds that the calculation results of the improved model are closer to the experimental results at a rotating speed of 2,500n/min or above. The calculation results are optimal under the working condition of a rotating speed of 3,370n/min and a flow of 180L/min. The calculated result of pump lift is 21.04m, with a calculation error of 0.67%, meaning that the calculation accuracy is improved by 0.3%; the calculated result of efficiency is 26.2%, with a calculation error of 0.76%, meaning that the accuracy is improved by 0.7%. After analyzing the inner flow field, the author finds that in the turbulence intensity nephogram calculated by the improved model, the turbulence intensity in the outlet area is low, the forward trend along the curved wall is weak and the veolocity is significantly reduced. From the turbulence kinetic energy nephogram, it can be seen that the calculation results of the improved model are low at the outlet and the central area, and that the turbulence development is weak. By comparing the calculation results and experimental results of the original model and the improved one, it can be proved that the improved turbulence model has higher calculation accuracy.

show abstract

“…At this time, all semi-finished products can be processed; 3. The processing times of all processes involved on the corresponding processing machines are known (Ahmadi et al, 2013;Seyed and Sadeghiazad, 2016;Kesavan et al, 2016;Rafiee and Sadeghiazad, 2016); 4. The processing sequences of all products are known; 5.…”

Section: Mathematical Description Of Multi-objective Fjspmentioning

confidence: 99%

On the Multi-objective Optimization Method of the Flexible Job-shop Scheduling Problem Based on Ant Colony Algorithm

2016

Revista de la Facultad de Ingeniería

View full text Add to dashboard Cite

Using the multi-objective method is to solve the flexible job-shop scheduling problem (FJSP), this paper optimizes the three objectives of the total processing time, the total machine load and the key machine load, analyzes the relations between the three optimization objectives in detail, and decides to minimize the total machine load and the key machine load during the process route selection and to minimize the total processing time during the process scheduling. According to the characteristics of multi-objective optimization, the author redesigns the update mode and state transition probability formula for local heuristic information of ant in the optimized ant colony algorithm. The simulation experiment proves the effectiveness of the mixed optimization algorithm of ant colony algorithm and particle swarm algorithm.

show abstract

Three-Dimensional CFD Simulation of Fluid Flow inside a Vortex Tube on Basis of an Experimental Model- The Optimization of Vortex Chamber Radius

Cited by 25 publications

References 19 publications

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Gas-liquid two-phase flow characteristics in pump-assisted evacuation process for pipeline

Research on the effect of rotation and curvature on turbulence model and their application

On the Multi-objective Optimization Method of the Flexible Job-shop Scheduling Problem Based on Ant Colony Algorithm

Contact Info

Product

Resources

About