An assessment of k-ε turbulence models for gas distribution analysis

Saeed, Muhammad; Yu, Jiguo; Abdalla, Aniseh Ahmed Atef; Zhong, Xianping; Ghazanfar, Mahmood Ahmad

doi:10.1007/s41365-017-0304-x

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…Quan Dong have verified the numerical simulation's reliability by contrastive analysis with experiment [14]. RNG k-ε turbulence model can simulate precisely the flow field structure of supersonic flow, the results are consistent with the experimental results [15][16]. S.P.…”

Section: Introductionsupporting

confidence: 61%

Experimental and numerical optimization of coal breakage performance parameters through abrasive gas jet

Liu¹,

Liang²,

Liu³

2017

IJHT

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In view of the low efficiency of coal breakage by high-pressure gas jet, this paper put forward a new method of efficient coal breakage method by abrasive gas jet (AGJ). According to the theory of aerodynamics theory, the nozzle structure was established. On this basis, the influence rule of jet parameters on the velocity and erosion rate of abrasive was studied by numerical simulation. Moreover, the experiment explored the relationship of the pressure of high-pressure abrasive jet and the target distance with the erosion depth, the erosion volume as well as the diameter of the erosion pit. According to the experimental results, based on the engineering application parameter range, when the jet pressure was 15MPa, the erosion rate was the largest and the erosion effect was the optimum on the premise of definite target distance. The erosion depth and erosion volume increased with the jet pressure. When the pressure was greater than 15MPa, the erosion depth and erosion volume did not increase obviously. The diameter of erosion pit was basically constant as the change of pressure. In the case of the definite jet flow pressure, the erosion depth first increased and then decreased with the increase of the target distance. The erosion volume and erosion pit diameter were in direct proportion to the target distance. Based on the comparative analysis of erosion depth, erosion volume, and erosion pit diameter, it has been determined that the optimal jet pressure of the abrasive gas is 15MPa, and the optimum target distance of jet flow is about 10cm.

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Section: Introductionsupporting

confidence: 61%

Experimental and numerical optimization of coal breakage performance parameters through abrasive gas jet

Liu¹,

Liang²,

Liu³

2017

IJHT

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“…For flows with high shear rates and large streamline curvature, RNG k-e turbulent model is more applicable. The governing equations include the continuity equation, momentum equation, turbulent kinetic energy equation and turbulent dissipation equation and have been introduced in detail in earlier publications; [43][44][45] consequently, they are not covered here. Finite volume method was used to discretize the governing equations, and pressure-velocity coupling was solved with PISO algorithm.…”

Section: Numerical Modelmentioning

confidence: 99%

Structural design and parameter optimization on a waste valve for hydraulic ram pumps

Yang

Guo

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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Hydraulic ram pump is an automatic water-lifting machinery, which converts the low-head potential energy of a large volume of water into a small high-head potential energy through the periodic open and close of waste valve and delivery valve. The pump would run inefficiently or even fail if the valves are poorly designed. In this paper, a novel and reliable waste valve of lift-check-valve structure has been developed. The sealing mode integrating soft and rigid sealing rings, the equation for the valve disc thickness and the equation for the flow passage in terms of the diffuser length, the larger radius and the smaller radius, are presented to guide future design. Major factors influencing the hydraulic performance, including the flow passage, valve opening and valve clack mass, are discussed with model experiments and numerical simulations. The optimized configuration for a 100-mm hydraulic ram pump includes a curved diffuser, 25–30-mm valve opening and 1.2-kg valve clack mass. The proposed waste valve can decrease the head loss coefficient of the system by 45%, achieve relatively higher working efficiency, and lift the largest water when the delivery head is lower than 30 m.

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“…The possible risk related to hydrogen was initially observed during the accident which occurred in Three Mile Island (TMI) in 1979. This was the first well-known example where combustion of hydrogen took place, and where an enormous quantity of hydrogen was generated as a consequence of steam-zirconium interaction in the fuel cladding (Abdalla et al, 2014;Saeed et al, 2016Saeed et al, , 2017aHuanga et al, 2017). The hydrogen detonation in the Fukushima Dai-ichi Nuclear Power Plant (NPP) accident (2011) was another example which compelled scientists to explore the risk of hydrogen detonation during a severe accident.…”

Section: Introductionmentioning

confidence: 99%

“…It is quite necessary to keep an eye on the hydrogen concentration during an accident scenario in the containment of an NPP to investigate the probable hydrogen risk and efficiency of the mitigation systems which are fixed in the containment of the NPP (Saeed et al, 2017a). In previous decades, scientists have developed two thermal-hydraulics approaches i.e., Lumped parameters (LP) and computational fluid dynamics (CFD) codes to simulate the related problems in the reactor core (Prabhudharwadkar et al, 2011;Xiao and Travis, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…We studied the experimental work from Deri et al (2010), and compared their experimental data with our simulation results obtained from HYDRAGON code (Abdalla, 2015;Abdalla et al, 2015;Saeed et al, 2016Saeed et al, , 2017aZhang et al, 2017). For the current paper, the published data of the air-fountain case (airfountain in the erosion of gaseous stratification) performed by Deri et al was selected as a benchmark.…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity Analysis of Some Key Factors on Turbulence Models for Hydrogen Diffusion Using HYDRAGON Code

Saeed

Zhong

et al. 2020

Front. Energy Res.

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In this paper, we have investigated the influence of air-fountain injection to study the hydrogen diffusion behavior with the help of 3-Dimensional code, HYDRAGON. Three different turbulence models i. e., Standard k −, model, Re-Normalized Group k − m model and Realizable k − e model have been studied carefully and the comparison of simulated data with experimental data were performed. The effect of air-injection was examined using three different velocities i.e., 0.411, 2.803, and 5.143 m/s to evaluate the phenomena of stratification break-up. When we kept the velocity of the air-injection as low as 0.411 m/s, the simulated results obtained through these three turbulence models were very close to experimental data. As the velocity was set to 5.143 m/s, the simulated data captured the experimental data well. But, when the velocity of air-injection was kept 2.803 m/s, the two turbulence models i.e., SKE and RNG turbulence models gave satisfactory results. However, when we added the turbulent diffusivity coefficient to RNG and RLZ turbulence models in the HYDRAGON code, a minor influence was investigated in these simulation results.

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An assessment of k-ε turbulence models for gas distribution analysis

Cited by 15 publications

References 33 publications

Experimental and numerical optimization of coal breakage performance parameters through abrasive gas jet

Experimental and numerical optimization of coal breakage performance parameters through abrasive gas jet

Structural design and parameter optimization on a waste valve for hydraulic ram pumps

Sensitivity Analysis of Some Key Factors on Turbulence Models for Hydrogen Diffusion Using HYDRAGON Code

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