Boundary layer effects on the critical nozzle of hydrogen sonic jet

Afroosheh, Mohammadamin; Vakilimoghaddam, F.; Paraschivoiu, Marius

doi:10.1016/j.ijhydene.2016.04.062

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…Afroosheh et al [40] (2017) presented a numerical study of the effect of boundary layer growth on critical nozzle of hydrogen sonic jet through a 1mm diameter pipe connected to a high pressure tank (up to 70MPa). The simulation showed that the boundary layer caused a supersonic flow in the nozzle.…”

Section: Numerical Simulation Workmentioning

confidence: 99%

Calibration Nozzle Performance-State of The Art

Shaalan

Kassem

Hagazy

2018

The Egyptian International Journal of Engineering Sciences and

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There has been deep interest by research workers in the metrology scope of sonic nozzle as measuring devices in certain engineering systems (e.g. calibration of gas flow meters, compressor discharge capacity testing and calibration of turbine engine gas passage). The main emphasis has been on how to enhance the accurate measurement of mass flow rate from such devices. Sonic nozzle one obvious solution in this case. Due to simple structure, high accuracy and stable performance.This paper gives an over view of up-to-date published research in the performance and characteristics of sonic nozzles used for calibrating gas flow meters. Some articles were reviewed and examined, covering various aspects of the subject, including the main illustrations and prominent results. The reviewed articles include those concentrating either on experimental, on numerical simulation, on theoretical investigation, or on combination. From discussion of articles there exist a great dependence on body temperature and geometry of sonic nozzle to get more accuratemeasurements .Beside that the back pressure effects on mass flow rate and normal shock in sonic nozzles used in calibration facilities should have more interest of study.Also there is still some room for further work, such as development the effect of geometry and kind of gases on discharge coefficient with deeper insight, to be carried out.

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Section: Numerical Simulation Workmentioning

confidence: 99%

Calibration Nozzle Performance-State of The Art

Shaalan

Kassem

Hagazy

2018

The Egyptian International Journal of Engineering Sciences and

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“…In fact, the boundary layer thickness initially grows along the pipe but close to the duct extremity becomes thinner. Therefore, a sort of converging–diverging nozzle that drives the Mach number over unity is obtained (Afroosheh, Vakilimoghaddam & Paraschivoiu 2017). Lijo, Kim & Setoguchi (2010) observed in numerical simulations that the boundary layer can be disturbed by the vorticity close to the pipe outlet, which leads to a reduction in the boundary layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the choking condition of one-dimensional diabatic flows with wall friction

Ferrari,

Vento

2023

J. Fluid Mech.

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The choking condition of a one-dimensional steady-state diabatic flow, with wall friction, of a perfect gas through a constant cross-section pipe has been analysed by applying a recent analytical solution. Such a choking condition can be achieved for an initially subsonic flow and a supersonic one, even when the heat flux goes from the fluid to the wall. Entropy–enthalpy diagrams have been analysed, and a universal choking condition for compressible diabatic flows with wall friction has been determined. The analytical solution of a supersonic flow, in which a normal shock occurs, has been obtained for a diabatic flow with wall friction and compared with the results of a numerical model.

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“…The work is carried on to investigate the wall pressure, flow separation, shock wave propagation and boundary layer transient flows through 3-D planar, supersonic convergent-divergent and Laval nozzle using different sub-grid models (WALE, WMLES, and Smagorinsky-Lilly) and proposed that WMLES provide best results using LES and validate it with experimental results [11][12][13]. The work was continued to predict the high pressure (70 MPa) hydrogen fluid flow behavior and its boundary layer pattern and concluded that fluid throat was generated due to viscous effects which acts as a convergent-divergent nozzle [14].…”

Section: Introduction mentioning

confidence: 99%

Design and Numerical Investigation to Predict the Flow Pattern of Non-axisymmetric Convergent Nozzle: A Component of Turboexpander

Kumar¹,

Panda²,

Biswal³

et al. 2019

JTTE

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Current work proposes a novel design methodology using curve-fitting approach for a non-axisymmetric airfoil convergent nozzle used in small-sized cryogenic turboexpander. The curves used for designing the nozzle are based on a combination of fifth and third order curve at upper and lower surface respectively. Four different turbulence model such as k-ε, SST, BSL and SSG Reynolds stress turbulence model is used to visualize and compare the fluid flow characteristics and thermal behaviors at various cross-sections. It is interesting to observe that the Mach number obtained at the outlet of the nozzle is highest and temperature drop is maximum for SSG model under similar boundary conditions. It is also observed that the designed nozzle with curve fitting approach is appropriate for impulse type turbine with a small amount of reaction. The key feature of this implementation is to obtain subsonic velocity at the nozzle exit and reduce the irreversible losses through the nozzle, which can affect the performance of a turboexpander.

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Boundary layer effects on the critical nozzle of hydrogen sonic jet

Cited by 6 publications

References 17 publications

Calibration Nozzle Performance-State of The Art

Calibration Nozzle Performance-State of The Art

Analysis of the choking condition of one-dimensional diabatic flows with wall friction

Design and Numerical Investigation to Predict the Flow Pattern of Non-axisymmetric Convergent Nozzle: A Component of Turboexpander

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