Study of Reynolds Stress Equation for Prediction of Flow Characteristics of Free Jet.

1978 ◽  
Author(s):  
Y. G. Tsuei
Keyword(s):  
Reynolds Stress ◽  
Flow Characteristics ◽  
Stress Equation ◽  
Free Jet

1012 FLOW CHARACTERISTICS OF SUBMERGED FREE JET FLOW FROM PETAL-SHAPED NOZZLE

2013 ◽  
Vol 2013.4 (0) ◽  
pp. _1012-1_-_1012-6_
Author(s):  
SHAKOUCHI Toshihiko ◽  
IRIYAMA Shota ◽  
KAWASHIMA Yuki ◽  
TSUJIMOTO Koichi ◽  
ANDO Toshitake
Keyword(s):  
Flow Characteristics ◽  
Jet Flow ◽  
Free Jet ◽  
Shaped Nozzle ◽  
Free Jet Flow

Modeling of the Thermal Characteristics of an Eccentric Multi-Stage Inverse Jet Diffusion Flame Burner

2014 ◽  
Author(s):  
Sherif Amin ◽  
Ahmed Emara ◽  
Adel Hussien ◽  
Ibrahim Shabaka
Keyword(s):  
Thermal Structure ◽  
Flame Structure ◽  
Flow Characteristics ◽  
Thermal Characteristics ◽  
Maximum Temperature ◽  
Reacting Flow ◽  
Free Jet ◽  
Multi Stage ◽  
Flame Burner ◽  
Dissipation Model

The objective of this paper is to study the effect of eccentricity on the thermal characteristics and flow field of a triple-concentric free jet burner. The investigation concerns three values of eccentricity (1.25, 1.88, and 2.5 times the inner-jet diameter); and in addition to the normal centric jet (no eccentricity). Prediction of the reacting flow characteristics and the planar flow visualization for all burners’ configurations is simulated with the CFD k-ε turbulence of “ANSYS-CFX”. In addition, the finite rate and eddy dissipation model is utilized to simulate the interaction between the chemical reaction and turbulence. The temperature, velocity and turbulence intensity are investigated to simulate the thermal-structure interaction. The results are obtained at a constant momentum rate. It showed significant changes in the coherent structures shed from the annular jets. By increasing the eccentricity, the maximum temperature will be attained more rapidly than centric case. In addition, the mixing point become nearer the burner rim, which increased the flame size and shifted the flame structure.

scholarly journals S053021 Flow Characteristics of Petal-Shaped Free Jet

2012 ◽  
Vol 2012 (0) ◽  
pp. _S053021-1-_S053021-5
Author(s):  
Toshihiko SHAKOUCHI ◽  
Shota IRIYAMA ◽  
Koichi TSUJIMOTO ◽  
Toshitake ANDO
Keyword(s):  
Flow Characteristics ◽  
Free Jet

Turbulent Flow Characteristics of Aim Impinging JET

1972 ◽  
Vol 186 (1) ◽  
pp. 635-635
Author(s):  
P. J. Russell ◽  
A. P. Hatton
Keyword(s):  
Flow Characteristics ◽  
Prediction Method ◽  
Turbulence Energy ◽  
Complex Flow ◽  
Free Jet ◽  
Impingement Zone ◽  
Turbulence Length ◽  
The Many ◽  
Turbulence Length Scale ◽  
Made In

Measurements of shear stress, turbulence energy and other parameters were made in the impingement region of a plane two-dimensional jet confined between parallel walls. Hot wire anemometer arrays were used to examine the turbulance levels in the three directions. The object of the experiments was to make comparisons with a prediction method previously proposed. Measurements were also made in the free jet and these agreed well with the many earlier results available. In the impingement zone where the turbulence levels are very high the order of agreement is encouraging despite the uncertainties present both in the theory and the experiment. In particular, the assumption of a constant turbulence length scale in such a complex flow is not confined by the measurements.

Flow Characteristics of a Free Jet Issuing from Rectangular Nozzle with Triangular Tapered Tubes at Corners

2020 ◽  
Vol 2020.57 (0) ◽  
pp. K034
Author(s):  
Riku OUCHI ◽  
Takahiro KIWATA ◽  
Takaaki KONO ◽  
Naoki KAJITANI ◽  
Hiroshi TERAMOTO
Keyword(s):  
Flow Characteristics ◽  
Free Jet ◽  
Rectangular Nozzle

504 Effect of Diameter of Injection Pipe on Flow Characteristics of Circular Free Jet Added Annular Suction Flow

2001 ◽  
Vol 2001.54 (0) ◽  
pp. 125-126
Author(s):  
Hidenari YAMASHITA ◽  
Minoru FUKUHARA ◽  
Tsutomu NOZAKI ◽  
Kazumi NAKAMURA
Keyword(s):  
Flow Characteristics ◽  
Free Jet ◽  
Suction Flow

Experimental Study on the Near Wake Behind Two Staggered Cylinders of Unequal Diameters

2012 ◽  
Author(s):  
Yangyang Gao ◽  
Xikun Wang ◽  
Soon Keat Tan
Keyword(s):  
Reynolds Stress ◽  
Incident Angle ◽  
Reynolds Shear Stress ◽  
Flow Characteristics ◽  
Circular Cylinders ◽  
Mean Flow ◽  
Near Wake ◽  
Particle Image Velocimetry Technique ◽  
Image Velocimetry ◽  
Spacing Ratio

The wake structure behind two staggered circular cylinders with unequal diameters was investigated experimentally using the particle image velocimetry technique (PIV). This investigation was focused on the variations of flow patterns in terms of incident angle at Reynolds number Re = 1200. Comparisons of the time-averaged flow field of two staggered cylinders with unequal diameters at different angles were made to elucidate the mean flow characteristics. The characteristics of Reynolds shear stress contours at different incident angles and spacing ratios were also investigated. The results showed that with increasing of incident angle, the scale of Reynolds stress contours behind the upstream cylinder becomes larger, as well as the effect of spacing ratio on Reynolds stress contours.

scholarly journals Characterization of the Behavior of Confined Laminar Round Jets

2012 ◽  
Author(s):  
D. Tyler Landfried ◽  
A. Jana ◽  
M. L. Kimber
Keyword(s):  
Reynolds Number ◽  
Poiseuille Flow ◽  
Stokes Equations ◽  
Flow Characteristics ◽  
Expansion Ratio ◽  
Downstream Location ◽  
Practical Applications ◽  
Free Jet ◽  
Laminar Jet ◽  
Jet Behavior

Confined laminar fluid jets have many practical applications in industry. Several examples include expansions in pipes and flow of gas into a large plenum. While much consideration has been given experimentally to heat transfer and pressure gradients within the confinement, little attention has been paid to quantify the velocity profiles and transitions between various flow behaviours. Using a finite volume CFD code, OpenFOAM ®, the Navier-Stokes equations were solved for varying expansion ratio, 1/ε = renclosure/rj, and varying Reynolds numbers. In the present analysis, Reynolds number based on the inlet jet diameter is varied from 30 to 70, well within the accepted range for laminar jet behavior. The expansion ratio, 1/ε is varied from 20–200. Of primary focus in the current study are compact correlations for the jet centreline velocity as a function of jet Reynolds number, Rej and expansion ratio. Similar functional dependences for the “linear” decay region of the jet, and the location of the stagnation point on the enclosure wall, are also investigated. These are all important features of the global flow field for the confined jet. Results suggest that initially, the flow characteristics are identical to a free jet. At some downstream location, the presence of the enclosure is felt by the jet and deviations begin to be seen from free jet behavior. This transition region continues until at a sufficiently large downstream location, the flow becomes fully developed, internal Poiseuille flow. In this paper, we analyse these transition regions and offer explanations and practical correlations to successfully predict the important flow physics that occur between free jet behavior and Poiseuille flow. Key dimensionless parameters are identified, the magnitude of which can be used to classify the flow conditions.

scholarly journals Flow Characteristics on Circular Free Jet Added Annular Suction Flow

1999 ◽  
Vol 19 (Supplement1) ◽  
pp. 235-238
Author(s):  
Minoru FUKUHARA ◽  
Tsutomu NOZAKI ◽  
Kazunari UEDA ◽  
Tsutomu FUKUDA ◽  
Hirokazu SONODA
Keyword(s):  
Flow Characteristics ◽  
Free Jet ◽  
Suction Flow
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