Journal ArticleDOI
An experimental investigation of coaxial turbulent jets
F. H. Champagne,Israel Wygnanski +1 more
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In this paper, the flow field generated by two coaxial jets was investigated experimentally with hot-wire anemometers and the area ratio between the external and internal nozzle was varied as well as the velocity issuing from each of the nozzles.About:
This article is published in International Journal of Heat and Mass Transfer.The article was published on 1971-09-01. It has received 160 citations till now. The article focuses on the topics: Turbulence & Nozzle.read more
Citations
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Prediction of free shear flows: A comparison of the performance of six turbulence models
TL;DR: In this paper, the authors evaluated three distinct classes of turbulence model: (1) Turbulent-viscosity models in which the length scale of turbulence is found by way of algebraic formulas, (2) turbulent-vivasosity models from a partial differential equation of transport, and (3) models in where the shear stress itself is the dependent variable of a partial-differential conservation equation.
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Flow regimes of large-velocity-ratio coaxial jets
TL;DR: In this article, the inner potential cone is truncated and is followed by an unsteady recirculation bubble with low-frequency oscillation, and the transition from one regime to another is explained by a simple model whose ingredients are the turbulent entrainment rate, governed by the outer jet mixing layers and mass conservation.
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Vortex structure and dynamics in the near field of a coaxial jet
TL;DR: In this paper, an experimental and numerical investigation into the structure of vortex patterns and the dynamics of their interactions for the incompressible flow in the near field of a round coaxial jet issuing into a quiescent ambient fluid is presented.
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An experimental investigation of an axisymmetric jet in a co-flowing air stream
R. A. Antonia,Robert W. Bilger +1 more
TL;DR: In this paper, an experimental investigation of the flow development of an axisymmetric jet exhausting into a moving air stream is made for two values of the ratio of jet velocity to external air velocity.
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Velocity near-field of variable density turbulent jets
TL;DR: In this article, an experimental investigation of the near field region of variable density turbulent jets is presented, where velocity measurements are performed using a two-component laser Doppler anemometer in an axisymmetric jet of helium, air or CO2 exhausting into a low speed air coflow.
References
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Journal ArticleDOI
Some measurements in the self preserving jet
Israel Wygnanski,H. E. Fiedler +1 more
TL;DR: In this paper, the axisymmetric turbulent incompressible and isothermal jet was investigated by use of linearized constant-temperature hot-wire anemometers and the quantities measured include mean velocity, turbulence stresses, intermittency, skewness and flatness factors, correlations, scales, low-frequency spectra and convection velocity.
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Turbulence measurements with inclined hot-wires Part 1. Heat transfer experiments with inclined hot-wire
TL;DR: In this article, the authors measured the heat transfer from inclined and normal wires to the flow with a high sensitivity infra-red detector coupled to a high resolution microscrope with reflective optics.
Journal ArticleDOI
The Flow Region Near the Nozzle in Double Concentric Jets
N. A. Chigier,J. M. Beér +1 more
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Turbulence measurements with inclined hot-wires. Part 2. Hot-wire response equations
F. H. Champagne,C. A. Sleicher +1 more
TL;DR: In this paper, hot-wire response equations to include the effects of the tangential velocity component as well as the non-linearities caused by high intensity turbulence are derived for linearized constant temperature operation.
Intensity, Scale, and Spectra of Turbulence in Mixing Region of Free Subsonic Jet
TL;DR: The results of the measurements of intensity of turbulence, the longitudinal and lateral correlation coefficients, and the spectra of turbulence in a 3.5-inch-diameter free jet measured with hot-wire anemometers at exit Mach numbers from 0.2 to 0.7 and Reynolds numbers from 192,000 to 725,000 as mentioned in this paper.