Unsteady effects in critical nozzles used for flow metering

Lavante, E. von; Zachcial, Andreas; Nath, B.; Dietrich, H.

doi:10.1016/s0263-2241(00)00021-x

Cited by 12 publications

(4 citation statements)

References 5 publications

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“…Recently, von Lavante et al [11] have made some experiments and computations in order to investigate the effect of pressure fluctuations on the nozzle flow. Kim et al [12] and Nagao et al [13] conducted numerical simulations and experiments, respectively.…”

Section: mentioning

confidence: 99%

Numerical Study on the Effect of Unsteady Downstream Conditions on Hydrogen Gas Flow through a Critical Nozzle

Nagao¹,

Matsuo²,

Setoguchi³

et al. 2012

OJFD

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A critical nozzle (sonic nozzle) is used to measure the mass flow rate of gas. It is well known that the coefficient of discharge of the flow in the nozzle is a single function of Reynolds number. The purpose of the present study is to investigate the effect of unsteady downstream condition on hydrogen gas flow through a sonic nozzle, numerically. Navier-Stokes equations were solved numerically using 3rd-order MUSCL type TVD finite-difference scheme with a second-order fractional-step for time integration. A standard k-ε model was used as a turbulence model. The computational results showed that the discharge coefficients in case without pressure fluctuations were in good agreement with experimental results. Further, it was found that the pressure fluctuations tended to propagate upstream of nozzle throat with the decrease of Reynolds number and an increase of amplitude of pressure fluctuations.

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Section: mentioning

confidence: 99%

Numerical Study on the Effect of Unsteady Downstream Conditions on Hydrogen Gas Flow through a Critical Nozzle

Nagao¹,

Matsuo²,

Setoguchi³

et al. 2012

OJFD

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“…A class of critical nozzles used for flow metering has been selected to analyse experimentally the unsteady effects [2] and a series of unique critical airflow Venturi have been developed to provide a constant air flow rate at low pressure drops [3]. These Venturi can be widely used in air quality studies and other field for accurate gas flow rate control.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Compressible Flow through Convergent–Divergent Nozzles

Mzad

Elguerri

2012

AMR

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The present paper is concerned with the study of compressible flow in a converging-diverging nozzle. From a theoretical and experimental investigation of the flow in an illustrative channel with convergent-divergent area variation, the behavior of the flow along the channel was found to be generally similar in trend to the flow in a stationary convergent-divergent nozzle. In compressible flows, the density and temperature variations are often significant. Therefore, the following study provides additional information on shock location, Mach number behavior and pressure distribution by varying nozzle length. The obtained curves show pressure distribution and Mach number along the two dimensioned nozzles which enable us to compare the experimental data with the theoretical calculations. Furthermore, interesting graphs are plotted which show the relationship between some nozzle parameters and flow characteristics.

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“…These normally have a constriction or expansion ratio from 2:1 to 4:1. The flow pattern is quite well known since many studies are available, both in experimental and numerical investigations for industrial applications (Szabo et al, 1997;Ahmed, 1998;Minota et al, 1998;Adamopoulos and Petropakis, 1999;Gruhn et al, 2000;Yang et al, 2000;Kunisch and Marduel, 2000;Lavante et al, 2001). …”

Section: Introductionmentioning

confidence: 99%

Two-phase flow patterns in turbulent flow through a dose diffusion pipe

Tang

Wrobel

Barton

2005

Nuclear Engineering and Design

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A numerical investigation is carried out for turbulent particle-laden flow through a dose diffusion pipe for a model reactor system. A Lagrangian Stochastic Monte-Carlo particle-tracking approach and the averaged Reynolds equations with a k-ε turbulence model, with a two-layer zonal method in the boundary layer, are used for the disperse and continuous phases. The flow patterns coupled with the particle dynamics are predicted. It is observed that the coupling of the continuous phase with the particle dynamics is important in this case. It was found that the geometry of the throat significantly influences the particle distribution, flow patterns and length of the recirculation region. The accuracy of the simulations depends on the numerical prediction and correction of the fluid phase velocity during a characteristic time interval of the particles. A numerical solution strategy for the computation of two-way momentum coupled flow is discussed. The three test cases show different flow features in the formation of a recirculation region behind the throat. The method will be useful for the qualitative analysis of conceptual designs and their optimisation.

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Unsteady effects in critical nozzles used for flow metering

Cited by 12 publications

References 5 publications

Numerical Study on the Effect of Unsteady Downstream Conditions on Hydrogen Gas Flow through a Critical Nozzle

Numerical Study on the Effect of Unsteady Downstream Conditions on Hydrogen Gas Flow through a Critical Nozzle

Theoretical and Experimental Investigation of Compressible Flow through Convergent–Divergent Nozzles

Two-phase flow patterns in turbulent flow through a dose diffusion pipe

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