THE k-ε MODEL AND COMPUTED SPREADING RATES IN ROUND AND PLANE JETS

Magi, Vinicio; Iyer, Venkatraman; Abraham, John

doi:10.1080/104077801753238130

Cited by 30 publications

(3 citation statements)

References 25 publications

(35 reference statements)

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“…It is a popular, robust model with a relatively low computational cost and which has shown good results according to several authors [8,14,20] as well as in the current validation process. It was necessary to modify the C1 constant from 1.44 to 1.52 due to the high propagation rate of the hydrogen jet, found in this model by [30]. The realizable K-ε model differs from the standard in the formulation of the equation for the turbulent dissipation rate and in C µ , , which becomes a variable as opposed to a constant in the standard.…”

Section: Preprocessing Settingsmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of Filling a Hydrogen Type 3 Tank at a Constant Mass Flow Rate

Monteiro,

Ribeiro,

Monteiro

et al. 2024

Energies

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Hydrogen storage in high-pressure tanks can be performed with different filling strategies. Many studies have been carried out on supplies with increasing pressure rates. The present work aims to carry out CFD numerical simulations, using Ansys Fluent®, in a type 3 tank of 70 MPa normal working pressure (NWP) using a constant flow rate, to analyze the influence of inlet key parameters such as initial temperature, mass flow rate, and material properties on the evolution of temperature, pressure, and velocity. From the analysis of the results, it was possible to discover linear relationships between the increase in the total equilibrium temperature and the final hydrogen temperature, as well as a linear increasing relationship between inlet and final temperatures when the equilibrium temperature was fixed. Considering fully adiabatic walls resulted in a significant increase in temperature with no predictable pattern. The difference between total and static temperatures found in the inlet tube decreased with the decrease in mass flow rate and subsequently the Mach number. The choice of a polymer for the tank lining led to higher temperatures when compared to an aluminum lining.

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Section: Preprocessing Settingsmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of Filling a Hydrogen Type 3 Tank at a Constant Mass Flow Rate

Monteiro,

Ribeiro,

Monteiro

et al. 2024

Energies

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“…Transient-state solvers with the second-order upwind scheme were adopted. Pressure-based realizable k-ϵ turbulence model was used since it gave a better accuracy in the study ( [15] , [16] , [17] ).…”

Section: Numerical Simulation(computational Model and Boundary Condit...mentioning

confidence: 99%

CFD simulation with analytical verification of discharging of nitrogen and helium from a high-pressure gas vessel

Elgezzar,

Rashad,

Hassan

et al. 2023

J. Phys.: Conf. Ser.

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Many applications and industrial processes may necessitate the storage of large amounts of gases at high pressures. These compressed gases could be extremely dangerous if unintentionally released. since they could be poisonous or combustible when mixed with air. This research seeks to create a CFD model and undertake an analytical investigation of the process of de-pressurization of high-pressure gas from a vessel. The vessel to be studied is used in a pneumatic power system used to operate the control surface of a flying vehicle. The study involved two working fluids (nitrogen and helium). The discharging process is considered as a typical mass and heat transfer problem solved analytically by adopting The First Law of Thermodynamics to an unsteady flow control volume and simulated by employing transient flow analysis to the CFD model. The research was carried out on 440 bars (absolute pressure) of pressurized gas vessels. Working gases for the study included nitrogen and helium. Analytical solution results for the two different gases have been compared with the CFD simulation results to assess the CFD model’s accuracy. A good match is achieved when the gas temperature, pressure, density, and outlet mass flow rate variations are compared. The results demonstrated a good match between the CFD and analytical data, proving the validity of the CFD model.

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“…It is a popular, robust model, with relatively low computational cost and which has shown good results, according to several authors, [5], [8], [16], as well as in the current validation process. It was necessary to modify the C1 constant from 1.44 to 1.52 due to a high propagation rate of the hydrogen jet, found in this model by [36]. The Realizable K -ε model differs from the Standard in the formulation of the equation for turbulent dissipation rate and in Cμ , , which becomes a variable as opposed to a constant in the Standard.…”

Section: Preprocessing Settingsmentioning

confidence: 99%

Numerical Simulation of Fast Filling a Hydrogen Tank at Constant Mass Flow Rate

Monteiro,

Ribeiro,

Monteiro

et al. 2023

Preprint

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Hydrogen storage in high pressure tanks can occur with different filling strategies. Many studies have been carried out on supplies with increasing pressure rates. However, hydrogen filling with constant mass inflow rate have not received the same attention. The present work aims to carry out numerical simulations to study hydrogen flow, in a type 3 tank of 70 MPa NWP and constant inflow rate condition. From the analysis of the results, it was possible to verify that there is a linear relationship between the increase in the total equilibrium temperature and the final hydrogen temperature. There is also a linear increasing relationship between Inlet and final temperatures when the equilibrium temperature is fixed. Considering fully adiabatic walls results in significant increases in temperature. The difference between total and static temperatures found in the Inlet tube decreases with the decrease in mass flow rate. The choice of a polymer for the tank lining led to higher temperatures when compared to an aluminum lining.

show abstract

THE k-ε MODEL AND COMPUTED SPREADING RATES IN ROUND AND PLANE JETS

Cited by 30 publications

References 25 publications

Computational Fluid Dynamics Simulation of Filling a Hydrogen Type 3 Tank at a Constant Mass Flow Rate

Computational Fluid Dynamics Simulation of Filling a Hydrogen Type 3 Tank at a Constant Mass Flow Rate

CFD simulation with analytical verification of discharging of nitrogen and helium from a high-pressure gas vessel

Numerical Simulation of Fast Filling a Hydrogen Tank at Constant Mass Flow Rate

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