Experimental study of co-annular jet subjected to transverse disturbances

Kurup, Arathi Laldinpuii; Ölçmen, Semih; Ahmed, Anwar

doi:10.1016/j.expthermflusci.2015.03.002

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…Arathi Laldinpuii Kurup et al [19] studied the flow field of two aligned coaxial jets consisting of an inner primary jet and an outer jet; The two-component laser-doppler-velocimetry technique was used for measurements of mean velocities and Reynolds stresses. They found that in the region between the outlets of the two jets, a toroidal recirculation vortex forms due to gradients of opposing pressure.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Inner Diameter and Reynolds Number on the Recirculation Zone in Annular Jet Flow

Habib

Sahnoun

Ismail

2022

International Journal of Applied Mechanics and Engineering

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In this paper, we focus on the effect of the inner diameter and Reynolds number on the recirculation zone in an annular jet flow with numerical simulation by resolving the Reynolds-averaged Navier-Stokes equations with the first closed model of turbulence k-epsilon. The annular jet plays an essential role in stabilizing the flame in the burner which is used in many industrial applications. The annular jet is characterized by the inner and outer diameter. In this study, three different inner diameters are adopted with constant width of the annular jet. We adopted also three different values of the Reynolds number show the effect of the Reynolds number on the recirculation zone. The simulation is realized by a CFD code which uses the finite element method. The results obtained from this study are in good agreement with the experimental data. Two recirculation zones are shown; a large recirculation zone at the outlet of the flow and a small recirculation zone just near the injection generated by the annular flow and the inner diameter Di ; it is observed that the size of the recirculation zone increases when the inner diameter increases and the length of the recirculation zone depends only on the inner diameter. This recirculation zone is also affected by the Reynolds number with a very low variation of the recirculation length.

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Section: Introductionmentioning

confidence: 99%

Effect of the Inner Diameter and Reynolds Number on the Recirculation Zone in Annular Jet Flow

Habib

Sahnoun

Ismail

2022

International Journal of Applied Mechanics and Engineering

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The Inefficacy of Chauvenet's Criterion for Elimination of Data Points

Limb

Work

Hodson

et al. 2017

Journal of Fluids Engineering

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Chauvenet's criterion is commonly used for rejection of outliers from sample datasets in engineering and physical science research. Measurement and uncertainty textbooks provide conflicting information on how the criterion should be applied and generally do not refer to the original work. This study was undertaken to evaluate the efficacy of Chauvenet's criterion for improving the estimate of the standard deviation of a sample, evaluate the various interpretations on how it is to be applied, and evaluate the impact of removing detected outliers. Monte Carlo simulations using normally distributed random numbers were performed with sample sizes of 5–100,000. The results show that discarding outliers based on Chauvenet's criterion is more likely to have a negative effect on estimates of mean and standard deviation than to have a positive effect. At best, the probability of improving the estimates is around 50%, which only occurs for large sample sizes.

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Experimental study of co-annular jet subjected to transverse disturbances

Cited by 2 publications

References 24 publications

Effect of the Inner Diameter and Reynolds Number on the Recirculation Zone in Annular Jet Flow

Effect of the Inner Diameter and Reynolds Number on the Recirculation Zone in Annular Jet Flow

The Inefficacy of Chauvenet's Criterion for Elimination of Data Points

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