Studies on Vortex Tubes : 3rd Report, Variations of Velocity, Temperature and Energy with Axial Distance, and Mechanism of Energy Separation

平七郎, 高浜

doi:10.1299/kikai1938.32.503

Cited by 5 publications

(1 citation statement)

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“…As indicated before, flow inside vortex tube is highly turbulent [26]; Therefore, a proper turbulence model should be considered for simulation. Some researches of scientists such as references [29][30][31], all verified better and more like experimental results in well-known turbulence k-ԑ model with respect to other turbulence models such as k-ω and SST. According to reports in above references, presented standard turbulence k-ε model which is used to simulate flow turbulence in this paper brings more accurate results with respect to Renormalization Group k -ε Model (RNG) and Reynolds Stress Model (RSM).…”

Section: Turbulence Simulationmentioning

confidence: 87%

CFD optimization of injection nozzles geometric dimensions of RHVT-machines in order to enhance the cooling capability

Bazgir¹,

Heydari²

2018

IJHT

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In this article, by using Computational Fluid Dynamic techniques, the optimized dimensions for injection nozzles of vortex tube machine are obtained. For this purpose, numerical simulation for different dimensions of length, width and height of nozzles is performed. However, other dimensions of modeled vortex tube are considered constant. The standard k-ε turbulence model was introduced to the governing equations for analyzing highly turbulence and compressible flows. The main goal of this study is to achieve the minimum amount of cold exit temperature by changing the dimensions of injection nozzles. In addition, an investigation is done upon pressure effect in the vortex tube chamber and its relation with the cold exit temperature and the best dimensions of nozzles are selected. Finally, some results of this article are validated by available experimental data. The comparisons show reasonable agreement.

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Section: Turbulence Simulationmentioning

confidence: 87%