Mean and Turbulence Characteristics of a Class of Three-Dimensional Wall Jets—Part 1: Mean Flow Characteristics

Padmanabham, G.; Gowda, B. H. Lakshmana

doi:10.1115/1.2926525

Cited by 59 publications

(22 citation statements)

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“…Few studies have investigated underexpanded wall gas jets in water. However, the present finding that the expansion angle in the developed region is independent of pressure agrees qualitatively with results of other studies of free underexpanded gas jets in water (Kitade et al 1980;Loth and Faeth 1989) and with wall water jets without underexpansion (Padmanabham and Gowda 1991).…”

Section: Expansion Angle Of Gas Jetsupporting

confidence: 94%

Entrained droplets in underexpanded gas jet in water

Someya

Uchida

et al. 2011

J Vis

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A visualization study was performed to investigate the flow of an underexpanded nitrogen gas jet injected into water. The stagnation pressure was varied in the range 0.5-8.0 MPa. The gas jet length and expansion angle were obtained from time-averaged images captured using a high-speed camera. The gas jet length and expansion angle increased approximately linearly with increasing stagnation pressure. The entrainment velocity and the velocity of entrained water droplets in the gas jet were obtained by particle image velocimetry.

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Section: Expansion Angle Of Gas Jetsupporting

confidence: 94%

Entrained droplets in underexpanded gas jet in water

Someya

Uchida

et al. 2011

J Vis

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“…Abrahamsson, Johansson, & Lofdahl, 1997;Agelinchaab & Tachie 2011a;Koso & Ohashi, 1981;Newman, Patel, Savage, & Tjio, 1972;Padmanabham & Gowda, 1991;Sforza & Herbst, 1970). Initial studies by Sforza & Herbst (1970) considered 3D wall jets generated from rectangular orifices with varying aspect ratios (height/length) of 0.025, 0.05, 0.1 and 1.…”

Section: Introductionmentioning

confidence: 93%

Experimental study of the flow structures of 3D turbulent offset jets

Nyantekyi-Kwakye

Tachie

Clark

et al. 2015

Journal of Hydraulic Research

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Three-dimensional turbulent offset jets were investigated using a particle image velocimetry technique. Detailed measurements were performed for offset height ratios of 0, 2 and 4. The presence of backflow influenced the distribution of the mean velocity and Reynolds stresses. A two-point correlation analysis was used to investigate the spatial distribution of large-scale structures within the inner shear layer of the flow domain. The results revealed that large-scale structures dominate the inner layer of the self-similarity region. Proper orthogonal decomposition was performed on the fluctuating velocity field within the symmetry and lateral planes using the snapshot approach. Results from the reconstructed field provided insight into the contributions of the most energetic structures to the turbulence statistics. The energetic structures contributed more to the Reynolds shear stress and streamwise turbulence intensity, while contributing less to the wall-normal turbulence intensity.

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“…[23] A review of the literature suggests that the wall-jet studies have usually focused on one type of wall jet separate from the others; i.e. plane, [2,4,5,24] radial, [22,[29][30][31] or three-dimensional [32][33][34][35] wall jets were studied singly, without being compared to the other types. Even the studies including comparisons between different types of wall jets [1,13,31,35] are limited to very basic characteristics (e.g.…”

Section: Introductionmentioning

confidence: 99%

Interaction of inner and outer layers in plane and radial wall jets

Banyassady

Piomelli

2015

Journal of Turbulence

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Large eddy simulations of turbulent radial and plane wall jets were performed at different Reynolds numbers using the Lagrangian dynamic eddy viscosity subgrid-scale model. The results were validated with experimental data available in the literature. Compared to the plane ones, the radial wall jets have an extra direction for expansion, which causes faster decay rates. Thus, the resulting pressure gradient distributions are different. However, the comparison of the results with the turbulent boundary layers under adverse and favourable pressure gradients reveals that these pressure gradients are not strong enough to cause any fundamental physical difference between plane and radial wall jets. In both cases, the local Reynolds number is an important determining factor in characterisation of the flow. The joint probability density function analysis shows that the local Reynolds number determines the level of intrusion of the outer layer into the inner layer: the lower the local Reynolds number, the stronger is the interaction of the inner and outer layers. These results can be used to clarify the scatter of the reported log-law constants in the literature.Keywords: plane wall jet; radial wall jet; logarithmic law of the wall; large eddy simulation; inner/outer layer interaction

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Mean and Turbulence Characteristics of a Class of Three-Dimensional Wall Jets—Part 1: Mean Flow Characteristics

Cited by 59 publications

References 0 publications

Entrained droplets in underexpanded gas jet in water

Entrained droplets in underexpanded gas jet in water

Experimental study of the flow structures of 3D turbulent offset jets

Interaction of inner and outer layers in plane and radial wall jets

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